作者： Tan, Mengjiao;Li, Hui*;Huang, Zhongliang;Wang, Zhiwei;Xiong, Ruoxuan;...

期刊： Journal of Cleaner Production,2021年283:124636 ISSN：0959-6526

通讯作者： Luo, Lin;Li, Hui

作者机构： [Tan, Mengjiao; Zhang, Jiachao; Luo, Lin] Hunan Agr Univ, Coll Resource & Environm, Changsha 410128, Peoples R China.;[Li, Changzhu; Tan, Mengjiao; Huang, Zhongliang; Li, Hui; Wu, Zijian; Jiang, Shilin] Hunan Acad Forestry, State Key Lab Utilizat Woody Oil Resource, Changsha 410004, Peoples R China.;[Li, Changzhu; Tan, Mengjiao; Li, Hui; Wu, Zijian; Jiang, Shilin] Hunan Acad Forestry, Inst Biol & Environm Engn, Changsha 410004, Peoples R China.;[Wang, Zhiwei] Energy Res Inst Co Ltd, Henan Acad Sci, Zhengzhou 450008, Peoples R China.;[Xiong, Ruoxuan] Nankai Univ, Coll Environm Sci & Engn, Tianjin 300350, Peoples R China.

通讯机构： [Luo, Lin; Li, Hui] H;Hunan Agr Univ, Coll Resource & Environm, Changsha 410128, Peoples R China.;Hunan Acad Forestry, State Key Lab Utilizat Woody Oil Resource, Changsha 410004, Peoples R China.;Hunan Acad Forestry, Inst Biol & Environm Engn, Changsha 410004, Peoples R China.

关键词： Atmospheric pressure;Calorific value;Carbon;Combustion;Costs;Hydrogen fuels;Colour parameters;Combustion characteristics;Combustion temperatures;Good correlations;Higher heating value;Industrial scale;Oxygen content;Volatile matters;Heavy metals

摘要： The oxidative torrefaction of rice straw polluted by heavy metals was carried out in a tube reactor (atmospheric pressure, AP) and an autoclave (gas-pressurized, GP), in order to compare the effects of the torrefaction temperature, carrier gas composition, and reactor type on torrefied products’ properties. Compared with the AP, the GP-torrefied rice straw had a lower solid yield, volatile matter, fixed carbon, hydrogen and oxygen contents, lower overall colour change (ΔE), combustion characteristic factor (SN), but a higher bulk density, higher heating value, ash and carbon content, higher combustion temperatures (Ti and Tf) and fuel ratio. The weight loss, volatile matter, element, higher heating values and combustion characteristics of the AP-torrefied rice straw showed good correlations with its colour parameters, which indicating that it is technically feasible to identification and prediction by the human eye of AP-torrefied RS at the industrial level. However, higher amount of typical heavy metals remained in the GP-torrefied solid products with lower biological availability, indicating that GP torrefaction can be utilized as a low-cost and safe pre-treatment for heavy-metal-polluted rice straw at the industrial scale. © 2020 Elsevier Ltd

语种： 英文

作者： Li, Hui;Liu, Yan;Luo, Zirui;Zhou, Yaoyu*;Hou, Dongmei;...

期刊： Environmental Technology,2021年42(10):1623-1633 ISSN：0959-3330

通讯作者： Zhou, Yaoyu

作者机构： [Hou, Dongmei; Luo, Zirui; Mao, Qiming; Yang, Yuan; Zhou, Yaoyu; Zhi, Dan; Li, Hui; Zhang, Jiachao; Luo, Lin] Hunan Agr Univ, Coll Resources & Environm, Changsha, Hunan, Peoples R China.;[Liu, Yan; Li, Hui] Hunan Modern Environm Technol Co LTD, Changsha, Hunan, Peoples R China.

通讯机构： [Zhou, Yaoyu] H;Hunan Agr Univ, Coll Resources & Environm, Changsha, Hunan, Peoples R China.

关键词： Passivator;rice growth;available Cd;remediation effect;mechanism

摘要： This study aimed to investigate the effects of red mud-based-passivator (RM-based-passivator) on rice yield, cadmium (Cd) in brown rice, pH and available Cd in Cd-polluted soil by pot experiments, and to explore the adsorption mechanism of the passivator by scanning electron microscope (SEM), energy-dispersive X-ray spectroscopy (EDX), fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) analysis. The results showed that this passivator obviously improved the pH, reduced the available Cd in soil and the Cd content in brown rice in Changsha Cd polluted soil (CS soil), while had little effect on Hengyang Cd polluted soil (HY soil). Compared with the control, the soil pH increased in the range from 0.31 to 1.37, the available Cd in soil decreased in the range from 13.25% to 52.34%, and the total Cd in brown rice decreased in the range from 46.44% to 84.98% in CS soil. Considering the impacts of RM-based-passivator on the growth of rice, the Cd content in brown rice, and the pH and available Cd in soil, 0.10–0.30% (w/w) of the passivator is recommended to apply in CS soil but not in HY soil. Based on the analysis of SEM, EDX, FTIR and XRD, the mechanism of Cd(II) adsorption by RM-based-passivator included physical adsorption, surface complexation and ion exchange. The present results indicated that the appropriate addition of RM-based-passivator could be an effective strategy for the remediation of acidic Cd-polluted soils. © 2019 Informa UK Limited, trading as Taylor & Francis Group.

语种： 英文

作者： Li, Mingyue;Zhang, Jiachao*;Yang, Xiao;Zhou, Yaoyu;Zhang, Lihua;...

期刊： 环境科学学报(英文版),2021年102(04):263-272 ISSN：1001-0742

通讯作者： Zhang, Jiachao;Yan, Qingyun

作者机构： [Yang, Yuan; Zhou, Yaoyu; Zhang, Jiachao; Zhang, Lihua; Li, Mingyue; Luo, Lin] Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Peoples R China.;[Yan, Qingyun; Li, Mingyue] Sun Yat Sen Univ, Environm Microbi Res Ctr, Sch Environm Sci & Engn, Southern Marine Sci & Engn Guangdong Lab Zhuhai, Guangzhou 510006, Peoples R China.;[Yang, Xiao] Korea Univ, Korea Biochar Res Ctr, O Jeong Ecoresilience Inst OJERI, Seoul 02841, South Korea.;[Yang, Xiao] Korea Univ, Div Environm Sci & Ecol Engn, Seoul 02841, South Korea.

通讯机构： [Zhang, Jiachao] H;[Yan, Qingyun] S;Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Peoples R China.;Sun Yat Sen Univ, Environm Microbi Res Ctr, Sch Environm Sci & Engn, Southern Marine Sci & Engn Guangdong Lab Zhuhai, Guangzhou 510006, Peoples R China.

关键词： Ammonia;Bacteria;Composting;Heavy metals;Nitrogen;Polymerase chain reaction;Remediation;RNA;Soils;Ammonia monooxygenase;Ammonia oxidizing archaea (AOA);Enzyme linked immunosorbent assay;Heavy metal contaminated soils;Heavy metal polluted soils;Heavy metal pollution;Integrated applications;Water-soluble carbons;Soil pollution;abundance;ammonia;bacterium;biochar;compost;heavy metal;soil amendment;soil microorganism;soil pollution;Bacteria (microorganisms);ammonia;biochar;charcoal;heavy metal;RNA 16S;archaeon;composting;genetics;microbiology;oxidation reduction reaction;soil;Ammonia;Archaea;Charcoal;Composting;Metals, Heavy;Oxidation-Reduction;RNA, Ribosomal, 16S;Soil;Soil Microbiology

摘要： Heavy metal pollution affects soil ecological function. Biochar and compost can effectively remediate heavy metals and increase soil nutrients. The effects and mechanisms of biochar and compost amendments on soil nitrogen cycle function in heavy-metal contaminated soils are not fully understood. This study examined how biochar, compost, and their integrated use affected ammonia-oxidizing microorganisms in heavy metal polluted soil. Quantitative PCR was used to determine the abundance of ammonia-oxidizing archaea (AOA) and bacteria (AOB). Ammonia monooxygenase (AMO) activity was evaluated by the enzyme-linked immunosorbent assay. Results showed that compost rather than biochar improved nitrogen conversion in soil. Biochar, compost, or their integrated application significantly reduced the effective Zn and Cd speciation. Adding compost obviously increased As and Cu effective speciation, bacterial 16S rRNA abundance, and AMO activity. AOB, stimulated by compost addition, was significantly more abundant than AOA throughout remediation. Correlation analysis showed that AOB abundance positively correlated with NO3−-N (r = 0.830, P < 0.01), and that AMO activity had significant correlation with EC (r = -0.908, P < 0.01) and water-soluble carbon (r = -0.868, P < 0.01). Those seem to be the most vital factors affecting AOB community and their function in heavy metal-polluted soil remediated by biochar and compost. © 2020

语种： 英文

作者： Grosbois, Cecile*;Desmet, Marc;Zhang, Mengxue;Gassama, Nathalie;Peng, Qinghui;...

期刊： Water,2021年13(3):271- ISSN：2073-4441

通讯作者： Grosbois, Cecile

作者机构： [Desmet, Marc; Grosbois, Cecile; Gassama, Nathalie] Univ Tours, Fac Sci, GeoHydorsyst Continentaux EA 6392, F-37200 Tours, France.;[Zhang, Mengxue] Cent South Univ, Sch Met & Environm, Changsha 410083, Peoples R China.;[Peng, Qinghui] ASEM Water Resources Res & Dev Ctr, Changsha 410028, Peoples R China.;[Zhang, Jiachao; Luo, Lin] Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Peoples R China.;[Zhang, Fengfeng; Battaglia, Fabienne] Bur Rech Geol & Minieres, Water Environm Proc Dev & Anal Div, F-45060 Orleans 02, France.

通讯机构： [Grosbois, Cecile] U;Univ Tours, Fac Sci, GeoHydorsyst Continentaux EA 6392, F-37200 Tours, France.

关键词： leaching experiment;mobility;surface sediment;trace elements;Xiangjiang river

摘要： <jats:p>Spatio-temporal distribution and leachability of some trace elements (TE) were investigated in sediments of the Xiangjiang River, tributary of the Yangtze River. Based on data collected during 2015–2017, a literature review and geoaccumulation indexes, the pollution level was the highest for Cd, Sb and Hg (Igeo &gt; 3). Over the period reviewed, the TE contamination level displayed almost no temporal variation but an obvious spatial distribution. The most upstream contamination hotspot (Cd &gt; Cr &gt; As, Cu, Pb, Zn &gt; Hg, Sb) was the Songbai section. This hotspot did not spread further downstream. The second hotspot identified was the Zhuzhou–Xiangtan section, impacted by Cd &gt; Hg, Pb, Zn &gt; Cu, with the Zhuzhou area being particularly highly impacted by Pb and Zn. A 30-day leaching experimental protocol under aerobic and anaerobic conditions was carried out to access TE mobility. Low percentages of TE released were calculated, showing that the TE fate mostly depends on the stability of bearing phases under specific physicochemical and microbial conditions. In this case, the studied sediments can be an important sink for these TE. However, some environmental issues have to be considered as some leachate concentrations of contaminants (As, Cr, Cu and U) released into water exceed freshwater aquatic life criteria.</jats:p>

语种： 英文

作者： Yao, Bin;Luo, Zirui;Zhi, Dan;Hou, Dongmei;Luo, Lin;...

期刊： Journal of Hazardous Materials,2021年403:123674 ISSN：0304-3894

通讯作者： Zhou, Yaoyu

作者机构： [Hou, Dongmei; Luo, Zirui; Yao, Bin; Zhi, Dan; Zhou, Yaoyu; Du, Shizhi; Luo, Lin] Hunan Agr Univ, Coll Resources & Environm, Hunan Int Sci & Technol Cooperat Base Agr Typical, Changsha 410128, Peoples R China.

通讯机构： [Zhou, Yaoyu] H;Hunan Agr Univ, Coll Resources & Environm, Hunan Int Sci & Technol Cooperat Base Agr Typical, Changsha 410128, Peoples R China.

关键词： Ethers;Photodegradation;Photolysis;Remediation;Advanced oxidation process;Biological degradation;Photo catalytic degradation;Polybrominated diphenyl ether (PBDEs);Reductive debromination;Removal method;Research needs;Toxic intermediates;Organic pollutants;2,2',4,4' tetrabromodiphenyl ether;decabromodiphenyl ether;polybrominated diphenyl ether;catalysis;catalyst;degradation;detection method;oxidation;PBDE;pollutant removal;adsorption;Article;biodegradation;bioremediation;debromination;oxidation;photocatalysis;photodegradation;photolysis;reduction (chemistry);soil pollution control;waste component removal;water pollution control

摘要： The widespread of polybrominated diphenyl ethers (PBDEs) in the environment has caused rising concerns, and it is an urgent endeavor to find a proper way for PBDEs remediation. Various techniques such as adsorption, hydrothermal and thermal treatment, photolysis, photocatalytic degradation, reductive debromination, advanced oxidation processes (AOPs) and biological degradation have been developed for PBDEs decontamination. A comprehensive review of different PBDEs remediation techniques is urgently needed. This work focused on the environmental source and occurrence of PBDEs, their removal and degradation methods from water and soil, and prospects for PBDEs remediation techniques. According to the up-to-date literature obtained from Web of Science, it could be concluded that (i) photocatalysis and photocatalytic degradation is the most widely reported method for PBDEs remediation, (ii) BDE-47 and BDE-209 are the most investigated PBDE congeners, (iii) considering the recalcitrance nature of PBDEs and more toxic intermediates could be generated because of incomplete degradation, the combination of different techniques is the most potential solution for PBDEs removal, (iv) further researches about the development of novel and effective PBDEs remediation techniques are still needed. This review provides the latest knowledge on PBDEs remediation techniques, as well as future research needs according to the up-to-date literature. © 2020 Elsevier B.V.

语种： 英文

作者： Yan, Binghua;Luo, Lin;Yang, Haijun*

期刊： Environmental Technology,2020年41(28):3722-3731 ISSN：0959-3330

通讯作者： Yang, Haijun

作者机构： [Yan, Binghua; Luo, Lin] Hunan Agr Univ, Coll Resources & Environm, Changsha, Hunan, Peoples R China;[Yan, Binghua] Chinese Acad Sci, Qingdao Inst Bioenergy & Bioprocess Technol, Lab Waste Valorizat & Water Reuse, Qingdao, Shandong, Peoples R China;[Yang, Haijun] Hunan Agr Univ, Coll Plant Protect, Changsha 410128, Hunan, Peoples R China

通讯机构： [Yang, Haijun] H;Hunan Agr Univ, Coll Plant Protect, Changsha 410128, Hunan, Peoples R China.

关键词： Octylphenol polyethoxylate;biodegradation;degradation characteristic;isolation;tannery wastewater

摘要： Octylphenol polyethoxylate (OPnEO) is a potential endocrine-disrupting chemical. Biodegradation of OPnEO was investigated using the bacterium Aeromonas sp. TXBc10 isolated from the influent of tannery waste treatment plant in Hunan Province, China. The bacterium was capable of utilizing OPnEO as the sole source of carbon and energy while OPnEO was degraded under aerobic batch culture conditions. Microbial degradation of OPnEO was studied in batch experiments for optimization of environmental factors. The effect of initial OPnEO concentrations on the degradation was investigated between 100 and 1000 mg center dot L-1 and the results showed that the biodegradation process conformed to the first-order kinetic model. The optimum pH, temperature, salinity and size of inoculum for OPnEO degradation by Aeromonas sp. TXBc10 was found to be 8.0 degrees C, 30 degrees C, 2.5% and 2.0%, respectively. The major metabolites of OPnEO degradation were identified as short-chain octylphenol polyethoxylate without octylphenol by high-performance liquid chromatography - mass spectrometer, which indicated that sequential cleavage of single ethoxylate units to form OPn-1EC might be the transformation mechanism of strain TXBc10. Considering that strain TXBc10 exhibits prominent advantage for biodegradation of OPnEO, it might serve as a promising candidate for in situ remediation of OPnEO and compounds with similar structure in tannery wastewater. [GRAPHICS] .

语种： 英文

作者： Tang, Jiayi;Zhang, Lihua;Zhang, Jiachao*;Ren, Liheng;Zhou, Yaoyu*;...

期刊： Science of The Total Environment,2020年701:134751 ISSN：0048-9697

通讯作者： Zhang, Jiachao;Zhou, Yaoyu

作者机构： [Zhang, Jiachao; Zhou, YY; Ren, Liheng; Zheng, Yuanyuan; Yang, Yuan; Tang, Jiayi; Zhou, Yaoyu; Zhang, Lihua; Chen, Anwei; Luo, Lin; Huang, Hongli] Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Hunan, Peoples R China.

通讯机构： [Zhang, JC; Zhou, YY] H;Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Hunan, Peoples R China.

关键词： Biochar;Compost;Enzyme activity;Heavy metal;Soil

摘要： Biochar and compost have been widely used for pollution remediation of heavy metals in soil. However, little research was conducted to explore the efficiency of biochar, compost and their combination to reduce heavy metals availability, and the effects of their additive on soil biological properties are often neglected. Therefore, this study investigated the effects of biochar, compost and their combination on availability of heavy metals, physicochemical features and enzyme activities in soil. Results showed that adding amendments to polluted soil significantly altered soil properties. Compared to the separate addition of biochar or compost, their combined application was more effective to improve soil pH, organic matter (OM), organic carbon (TOC) and available potassium (AK). All amendments significantly decreased the availability of Cd and Zn, but slightly activated As and Cu. In addition, soil enzyme activities were activated by compost and inhibited by biochar, but exhibited highly variable responses to their combinations. Pearson correlation analysis indicated that electrical conductivity (EC) and AK were the most important environmental factors affecting metal availability and soil enzyme activities including dehydrogenase, catalase, beta-glucosidase, urease, acid and alkaline phosphatase, arylsulfatase except for protease and invertase. Availability of As, Cu, Cd and Zn affected dehydrogenase, catalase and urease activities. These results indicated that biochar, compost and their combination have significant effects on physicochemical features, metals availability and enzyme activities in heavy metal-polluted soil.

语种： 英文

作者： Zhi, Dan;Zhang, Jia;Wang, Jianbing;Luo, Lin*;Zhou, Yuzhou;...

期刊： Journal of Environmental Management,2020年265:110571 ISSN：0301-4797

通讯作者： Luo, Lin;Zhou, Yaoyu

作者机构： [Luo, Lin; Zhou, YY; Zhou, Yuzhou; Zhi, Dan; Zhou, Yaoyu; Zhang, Jia] Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Peoples R China.;[Wang, Jianbing] China Univ Min & Technol, Sch Chem & Environm Engn, Beijing Campus, Beijing 100083, Peoples R China.

通讯机构： [Luo, L; Zhou, YY] H;Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Peoples R China.

关键词： Cathodes;Chemical oxygen demand;Coal tar;Coking;Efficiency;Electrochemical oxidation;Electrolytes;Electrooxidation;pH;Polycyclic aromatic hydrocarbons;Titanium compounds;Wastewater treatment;Coal-gasification wastewaters;Coking coal;Coking wastewater;Hydrocarbon removal;Polynuclear aromatic hydrocarbon removal;Polynuclear aromatic hydrocarbons;Real wastewater;Real wastewater treatment;The ti/RuO2–IrO2 anode;The ti/ti4O7 anode;Anodes;iridium;polycyclic aromatic hydrocarbon;ruthenium derivative;ruthenium oxide;titanium derivative;unclassified drug;coal;coke;titanium;chemical reaction;electrochemical method;electrode;electrolyte;inorganic compound;oxidation;PAH;pollutant removal;total organic carbon;wastewater;wastewater treatment;Article;coal gasification;controlled study;current density;electrochemical analysis;oxidation;pH;total organic carbon;waste component removal;waste water management;electrode;oxidation reduction reaction;waste water;water pollutant;Coal;Coke;Electrodes;Oxidation-Reduction;Titanium;Waste Water;Water Pollutants, Chemical

摘要： Electrochemical treatments of coking wastewater (CW) and coal gasification wastewater (CGW) were conducted with Ti/Ti4O7 and Ti/RuO2–IrO2 anodes. The performances of Ti/Ti4O7 and Ti/RuO2–IrO2 anodes were investigated by analyzing the effects of five key influencing factors including anodes material, current density, anode-cathode distance, initial pH value, and electrolyte type. The removal efficiencies of total organic carbon (TOC) were analyzed during the processes of CW and CGW electro-oxidation. The removal efficiencies of sixteen polynuclear aromatic hydrocarbons (PAHs) in CW and CGW by electro-oxidation were also explored to further assess the electrochemical activities of Ti/Ti4O7 and Ti/RuO2–IrO2 anodes. The Ti/Ti4O7 anode achieved 78.7% COD removal efficiency of CW, 85.8% COD removal efficiency of CGW, 50.3% TOC removal efficiency of CW, and 54.8% TOC removal efficiency of CGW, higher than the Ti/RuO2–IrO2 anode (76.7%, 78.1%, 44.8% and 46.8%). The COD removal efficiencies increased with the applied current density, decreased with the increase of the anode-cathode distance, and slightly decreased with the increase of the initial pH value. Meanwhile, the removal efficiencies of sixteen PAHs by the Ti/Ti4O7 anode were mostly higher than those by the Ti/RuO2–IrO2 anode. By comprehensively analyzing the performances of Ti/Ti4O7 and Ti/RuO2–IrO2 anodes on electrochemical treatments of CW and CGW, this study may supply insights into the application potentials of these anodes to the electrochemical treatments of real wastewater. © 2020 Elsevier Ltd

语种： 英文

作者： 张攀;侯冬梅;魏东宁;罗琳

期刊： 湖南农业科学,2020年(08):41-46 ISSN：1006-060X

作者机构： 湖南农业大学资源环境学院,湖南 长沙 410128;[罗琳; 魏东宁; 张攀; 侯冬梅] 湖南农业大学

关键词： 生物铁锰氧化物;锰离子吸附;反应动力学;表征分析

摘要： 利用驯化获得的铁锰氧化混合细菌制备生物铁锰氧化物(BFMO),采用比表面积测定仪(BET)、扫描电镜(SEM-EDS)和傅里叶红外变换光谱(FT-IR)对所生成的BFMO进行表征,通过考察投加量和pH值对Mn(Ⅱ)吸附性能的影响,探究了BFMO对Mn(Ⅱ)的吸附机理.结果 表明:BFMO具有较大的比表面积(79.22 m2/g),孔体积为0.15 cm3/g,表面含有许多含氧官能团,有利于Mn(Ⅱ)的吸附.SEM-EDS进一步表明生物铁锰氧化物中既含有铁锰氧化物,也有微生物菌体生成的细胞类物质.BFMO对Mn(Ⅱ)的去除效果较好,在pH值为7.0、投加量为2 g/L、固液比为1 g:500 mL时,吸附量为16.43 mg/g,吸附过程符合准二级动力学模型和Freundlich吸附等温模型,说明吸附过程主要由化学反应控制,属于多层吸附.

语种： 中文

作者： Hou, Dongmei;Zhang, Pan;Wei, Dongning;Zhang, Jiachao;Yan, Binghua;...

期刊： Journal of Hazardous Materials,2020年396:122631 ISSN：0304-3894

通讯作者： Zhou, Yaoyu;Luo, Lin

作者机构： [Zhang, Pan; Hou, Dongmei; Yan, Binghua; Zhou, YY; Luo, Lin; Cao, Linying; Wei, Dongning; Zhou, Yaoyu; Zhang, Jiachao] Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Peoples R China.

通讯机构： [Zhou, YY; Luo, L] H;Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Peoples R China.

关键词： Bacteria;Drainage;Efficiency;RNA;Acclimated bacteria;Acid mine drainage;Bacterial consortium;High-throughput sequencing;Microbial communities;Removal efficiencies;Simultaneous removal;Stenotrophomonas;Iron;functional group;iron;iron oxide;manganese;manganese oxide;RNA 16S;iron;manganese;RNA 16S;acid mine drainage;bacterium;concentration (composition);functional group;incubation;iron;microbial community;oxidation;pollutant removal;reactive oxygen species;wastewater treatment;acclimatization;acid mine drainage;Article;bacterium;bacterium culture;Brevundimonas;controlled study;Flavobacterium;heavy metal removal;high throughput sequencing;iron oxidizing bacterium;manganese oxidizing bacterium;microbial community;nonhuman;pH;Stenotrophomonas;surface area;surface property;Thermomonas;bacterium;genetics;oxidation reduction reaction;water pollutant;Bacteria (microorganisms);Brevundimonas;Flavobacterium;Stenotrophomonas;Thermomonas;Bacteria;Iron;Manganese;Oxidation-Reduction;RNA, Ribosomal, 16S;Water Pollutants, Chemical

摘要： A bacterial consortium for efficient decontamination of high-concentration Fe–Mn acid mine drainage (AMD) was successfully isolated. The removal efficiencies of Fe and Mn were effective, reaching 99.8 % and 98.6 %, respectively. High-throughput sequencing of the 16S rRNA genes demonstrated that the microbial community had changed substantially during the treatment. The Fe–Mn oxidizing bacteria Flavobacterium, Brevundimonas, Stenotrophomonas and Thermomonas became dominant genera, suggesting that they might play vital roles in Fe and Mn removal. Moreover, the pH of culture increased obviously after incubation, which was benefit for depositing Fe and Mn from AMD. The specific surface area of the biogenic Fe–Mn oxides was 108–121 m2/g, and the surface contained reactive oxygen functional groups (–OH and −COOH), which also improved Fe and Mn removal efficiency. Thus, this study provides an alternative method to treat AMD containing high concentrations of Fe and Mn. © 2020 Elsevier B.V.

语种： 英文

作者： Wang, Qiang;Li, Lei;Long, Chen-Lu;Luo, Li;Yang, Yuan*;...

期刊： Environmental Technology,2020年41(8):1015-1022 ISSN：0959-3330

通讯作者： Yang, Zhao-Guang;Yang, Yuan

作者机构： [Luo, Li; Wang, Qiang; Long, Chen-Lu; Yang, Zhao-Guang; Li, Lei] Cent South Univ, Coll Chem & Chem Engn, Ctr Environm & Water Resources, 932 Lushan Nan Rd, Changsha 410083, Peoples R China.;[Yang, Yuan; Zhou, Yaoyu] Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Peoples R China.;[Yang, Yuan; Zhou, Yaoyu] Hunan Agr Univ, Int Joint Lab Hunan Agr Typ Pollut Restorat & Wat, Changsha 410128, Peoples R China.

通讯机构： [Yang, Zhao-Guang] C;[Yang, Yuan] H;Cent South Univ, Coll Chem & Chem Engn, Ctr Environm & Water Resources, 932 Lushan Nan Rd, Changsha 410083, Peoples R China.;Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Peoples R China.;Hunan Agr Univ, Int Joint Lab Hunan Agr Typ Pollut Restorat & Wat, Changsha 410128, Peoples R China.

关键词： C60;carbon nanomaterials;dispersive liquid-liquid micro-extraction;environmental water;high-performance liquid chromatography-UV detector

摘要： The wide application of fullerene C60 nanoparticles would inevitably lead to their release into the environment. In order to evaluate the environment risks of C60 and the subsequent effects on ecosystem health, a reliable quantitative methodology of C60 should be established. In this study, a rapid pretreatment method called low-density solvent-based dispersive liquid–liquid micro-extraction (DLLME) combined high-performance liquid chromatography-UV detector (HPLC-UV) was developed to detect C60 in environmental water. In this proposed method, toluene and methanol were chosen as the extraction solvent and the dispersive solvent, respectively. The optimized volume of extraction solvent and dispersive solvent were 100 μL and 10 μL, respectively. And the best shaking time was chosen as 10 min at room temperature for the optimal homogenization procedure for the extraction of C60 in water samples. The enrichment factor of 50 was obtained with 100 μL toluene, and the recoveries of C60 from various environmental samples were in the range of 81.4 ± 5.0–101.4 ± 6.2% at 1.25–5.00 µg/L spiked levels. The detection limits of C60 in tap water, surface water, living sewage and mining waste water were 0.19, 0.29, 0.34 and 0.22 μg/L, respectively. The low detection limit, good linear range and high recoveries of C60 in environmental water indicated that the proposed method could provide an efficient approach for the analysis and tracking of C60 in the environment. © 2018, © 2018 Informa UK Limited, trading as Taylor & Francis Group.

语种： 英文

作者： Wu, Shikang;Zhou, Hao;Luo, Lin;Zhou, Yaoyu*

期刊： Environment International,2019年127:1-4 ISSN：0160-4120

通讯作者： Zhou, Yaoyu

作者机构： [Wu, Shikang; Zhou, Yaoyu; Luo, Lin] Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Hunan, Peoples R China.;[Wu, Shikang; Zhou, Yaoyu; Luo, Lin] Hunan Agr Univ, Hunan Int Sci & Technol Cooperat Base Agr Typ Pol, Changsha 410128, Hunan, Peoples R China.;[Zhou, Hao] Chinese Acad Sci, State Key Lab Organ Geochem, Guangzhou Inst Geochem, Guangzhou 510640, Guangdong, Peoples R China.;[Zhou, Hao] Univ Chinese Acad Sci, Beijing 100049, Peoples R China.

通讯机构： [Zhou, Yaoyu] H;Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Hunan, Peoples R China.;Hunan Agr Univ, Hunan Int Sci & Technol Cooperat Base Agr Typ Pol, Changsha 410128, Hunan, Peoples R China.

摘要： [无可用摘要]

语种： 英文

作者： Li, Lei;Wang, Qiang*;Yang, Yuan*;Luo, Li;Ding, Ru;...

期刊： Analytical Chemistry,2019年91(15):9442-9450 ISSN：0003-2700

通讯作者： Wang, Qiang;Yang, Yuan

作者机构： [Luo, Li; Ding, Ru; Wang, Qiang; Yang, Zhao-Guang; Li, Lei; Li, Hai-Pu] Cent S Univ, Coll Chem & Chem Engn, Ctr Environm & Water Resources, 932 Lushan Nan Rd, Changsha 410083, Hunan, Peoples R China.;[Yang, Yuan] Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Hunan, Peoples R China.;[Yang, Yuan; Luo, Li; Ding, Ru; Wang, Qiang; Yang, Zhao-Guang; Wang, Q; Yang, Y; Li, Lei; Li, Hai-Pu] Cent S Univ, Key Lab Hunan Prov Water Environm & Agr Prod Safe, Changsha 410083, Hunan, Peoples R China.;[Yang, Yuan] Hunan Agr Univ, Int Joint Lab Hunan Agr Typ Pollut Restorat & Wat, Changsha 410128, Hunan, Peoples R China.;[Yang, Yuan] 932 Lushan Nan Rd, Changsha 410083, Hunan, Peoples R China.

通讯机构： [Wang, Qiang; Wang, Q; Yang, Y] C;[Yang, Yuan] H;[Yang, Yuan] 9;Cent S Univ, Coll Chem & Chem Engn, Ctr Environm & Water Resources, 932 Lushan Nan Rd, Changsha 410083, Hunan, Peoples R China.;Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Hunan, Peoples R China.

摘要： For understanding the environmental behavior and toxicity of Ag nanoparticles (Ag-NPs), a quantitative method for characterizing the AgNPs in soils and sediments is urgently needed. In this study, we validated a previously developed extraction method by optimizing the extraction of silver nanoparticles from soil and sediment samples to which engineered AgNPs had been added. The samples were analyzed by single particle inductively coupled plasma mass spectrometry (SP-ICP-MS). Initially, different extraction conditions were evaluated to validate the optimal extraction procedure. Then the optimal extraction procedure was applied to environmental soil and sediment samples spiked with AgNPs. The extraction data for Ag-NPs with sizes below 30 nm was not shown due to the particle size detection limit of the SP-ICP-MS method (∼20 nm). The number concentrations of Ag particles extracted from different environmental soils and sediments matrices were in the range of (12 ± 1-23 ± 1) × 107 particles/g soil. Similarly, 53.4-100.0% of the particulate Ag mass was recovered. For the relatively low Ag mass recovery of Guiyu agricultural soil, the Ag mass recovery shows great improvement (from 53.4 to 105.8%) by the soil dilution using SiO2. The optimal method was validated to be feasible for extracting Ag-NPs from environmental soils and sediments, except for the soil with high soil organic matter (SOM) content. The SiO2 dilution of soil provides a promising way to promote the extraction of Ag-NPs in soil (or sediment) with high SOM content, which could further promote the study on the environmental behavior and toxicity of Ag-NPs in soil and sediment environment. © 2019 American Chemical Society.

语种： 英文

作者： Zhou, Hao;Wu, Shikang;Zhou, Yaoyu*;Yang, Yuan;Zhang, Jiachao;...

期刊： Environment International,2019年128:77-88 ISSN：0160-4120

通讯作者： Zhou, Yaoyu;Tsang, Daniel C. W.

作者机构： [Zhou, Hao; Yang, Yuan; Wu, Shikang; Zhou, Yaoyu; Zhang, Jiachao; Luo, Lin] Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Hunan, Peoples R China.;[Zhou, Hao] Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Organ Geochem, Guangzhou 510640, Guangdong, Peoples R China.;[Zhou, Hao] Univ Chinese Acad Sci, Beijing 100049, Peoples R China.;[Wang, Shaobin; Duan, Xiaoguang] Univ Adelaide, Sch Chem Engn, Adelaide, SA 5005, Australia.;[Wang, Lei] Univ Sheffield, Dept Mat Sci & Engn, Sir Robert Hadfield Bldg,Mappin St, Sheffield S1 3JD, S Yorkshire, England.

通讯机构： [Zhou, Yaoyu; Tsang, Daniel C. W.] H;Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Hunan, Peoples R China.;Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hung Hom, Kowloon, Hong Kong, Peoples R China.

关键词： Iron-based nanomaterials;Potassium monopersulfate;Fenton-like reaction;Antibiotics degradation;Green/sustainable remediation;Environmental catalysts

摘要： Iron nanoparticles encapsulated within boron and nitrogen co-doped carbon nanoshell (B/N-C@Fe) were synthesized through a novel and green pyrolysis process using melamine, boric acid, and ferric nitrate as the precursors. The surface morphology, structure, and composition of the B/N-C@Fe materials were thoroughly investigated. The materials were employed as novel catalysts for the activation of potassium monopersulfate triple salt (PMS) for the degradation of levofloxacin (LFX). Linear sweep voltammograms and quenching experiments were used to identify the mechanisms of PMS activation and LFX oxidation by B/N-C@Fe, where SO4− as well as HO were proved to be the main radicals for the reaction processes. This study also discussed how the fluvic acid and inorganic anions in the aqueous solutions affected the degradation of LFX and use this method to simulate the degradation in the real wastewater. The synthesized materials showed a high efficiency (85.5% of LFX was degraded), outstanding stability, and excellent reusability (77.7% of LFX was degraded in the 5th run) in the Fenton-like reaction of LFX. In view of these advantages, B/N-C@Fe have great potentials as novel strategic materials for environmental catalysis.

语种： 英文

作者： Xiang, Yujia;Zhou, Yaoyu;Yang, Yuan;Luo, Lin

期刊： Journal of Hazardous Materials,2019年367:356 ISSN：0304-3894

通讯作者： Zhou, Yaoyu(zhouyy@hunau.edu.cn)

作者机构： [Xiang, Yujia; Yang, Yuan; Luo, Lin] College of Resources and Environment, Hunan Agricultural University, Changsha, 410128, China;[Zhou, Yaoyu] College of Resources and Environment, Hunan Agricultural University, Changsha, 410128, China. Electronic address: zhouyy@hunau.edu.cn

通讯机构： [Yaoyu Zhou] C;College of Resources and Environment, Hunan Agricultural University, Changsha, 410128, China

关键词： 2 nitrophenol;aromatic amine;metal ion;peroxydisulfate potassium;phenol derivative;catalysis;environmental impact;high temperature;Note;nucleophilicity

摘要： [无可用摘要]

语种： 英文

作者： Xiang, Yujia;Xu, Zhangyi;Wei, Yuyi;Zhou, Yaoyu*;Yang, Xiao;...

期刊： Journal of Environmental Management,2019年237:128-138 ISSN：0301-4797

通讯作者： Zhou, Yaoyu;Yang, Jian

作者机构： [Xu, Zhangyi; Wei, Yuyi; Xiang, Yujia; Yang, Yuan; Yang, Jian; Zhou, Yaoyu; Zhang, Jiachao; Zhou, YY; Yang, J; Luo, Lin] Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Hunan, Peoples R China.;[Xu, Zhangyi; Wei, Yuyi; Xiang, Yujia; Yang, Yuan; Yang, Jian; Zhou, Yaoyu; Zhang, Jiachao; Luo, Lin] Hunan Agr Univ, Hunan Int Sci & Technol Cooperat Base Agr Typ Pol, Changsha 410028, Hunan, Peoples R China.;[Zhou, Zhi] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Zhou, Yaoyu; Yang, Xiao] Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hung Hom, Kowloon, Hong Kong, Peoples R China.

通讯机构： [Zhou, YY; Yang, J] H;Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Hunan, Peoples R China.

关键词： Activated carbon;Activated carbon treatment;Amides;Antibiotics;Environmental technology;Organic pollutants;Sulfur compounds;Water pollution;Adsorption mechanism;Adsorption process;Antibiotic removal;Biochar;Carbon based materials;Carbonaceous materials;Influencing factor;Removal mechanism;Soil and water;Soil environment;Adsorption;activated carbon;adsorbent;antibiotic agent;carbon;carbon nanotube;chloramphenicol;graphene;quinoline derived antiinfective agent;sulfonamide;tetracycline derivative;antiinfective agent;carbon nanotube;charcoal;graphite;activated carbon;adsorption;antibiotics;carbon;carbon nanotube;factor analysis;organic pollutant;pollutant removal;adsorption kinetics;Article;process optimization;waste component removal;adsorption;water pollutant;Adsorption;Anti-Bacterial Agents;Charcoal;Graphite;Nanotubes, Carbon;Water Pollutants, Chemical

摘要： With the development of the removal of organic pollutants in the soil and water environment, antibiotics have been considered as emerging pollutants and received considerable attention among the scientific community. Thus, there is a need for an effective, economical, fast, operational feasible and environmental-friendly technology to remove antibiotics. Adsorption technology would be one of the most promising option on the basis that it best meets the criteria we set out above. From the most primitive activated carbon to the most innovative modified biochar, carbon-based materials have played a significant role in the adsorption process of antibiotics all the time. This paper reviews the adsorption behavior of some representative antibiotics (e.g., chloramphenicols, sulfonamides, tetracyclines, flouroquinolones) over various carbonaceous materials (i.e., activated carbon, carbon nanotubes, graphene, and biochar). Nevertheless, in addition to the structural characteristics and adsorption capacities of carbon-based materials, a special emphasis was placed on the underlying adsorption mechanisms and roles of different influencing factors in the adsorption process. Moreover, the knowledge gaps and research challenges have been highlighted, including design and optimization of the carbonaceous materials for antibiotics adsorption. © 2019 Elsevier Ltd

语种： 英文

作者： Wang, Juan;Li, Qinjin;Peng, Yuande;Yang, Huilin;Wang, Zhi*;...

期刊： JOURNAL OF ECONOMIC ENTOMOLOGY,2019年112(1):335-340 ISSN：0022-0493

通讯作者： Wang, Zhi

作者机构： [Peng, Yuande; Wang, Zhi; Wang, Juan] Chinese Acad Agr Sci, Inst Bast Fiber Crops, Changsha 410205, Hunan, Peoples R China.;[Yang, Huilin; Wang, Juan] Hunan Agr Univ, Coll Biosci & Biotechnol, Changsha 410128, Hunan, Peoples R China.;[Li, Qinjin; Luo, Lin] Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Hunan, Peoples R China.;[Li, Qinjin] Hunan Womens Univ, Tourism Dept, Changsha 410000, Hunan, Peoples R China.;[Wang, Zhi] Hunan Normal Univ, Coll Life Sci, Changsha 410081, Hunan, Peoples R China.

通讯机构： [Wang, Zhi] C;[Wang, Zhi] H;Chinese Acad Agr Sci, Inst Bast Fiber Crops, Changsha 410205, Hunan, Peoples R China.;Hunan Normal Univ, Coll Life Sci, Changsha 410081, Hunan, Peoples R China.

关键词： insect protein;insecticide;methamidophos;peptide hydrolase;phosphorothioic acid derivative;animal;drug effect;enzymology;female;gastrointestinal tract;hydrolysis;metabolism;spider;ultrastructure;Animals;Female;Gastrointestinal Tract;Hydrolysis;Insect Proteins;Insecticides;Organothiophosphorus Compounds;Peptide Hydrolases;Spiders

摘要： A piezoelectric quartz crystal impedance (PQCI) sensor was used to investigate influences of the insecticide methamidophos on proteinase activity in midguts of the wolf spider, Pardosa pseudoamulata (Araneae: Lycosidae). Results from PQCI indicated that low-concentration dose methamidophos (0.008%) can activate the proteinase but high-concentration dose methamidophos (0.016-0.032%) can inhibit the enzyme activity. The changes in subcellular structure of spider midgut cells were also observed. Electron micrographs of spider midgut epithelial cells showed that the low-dose methamidophos did not visibly impact the structure of these cells. Conversely, high-concentration dose methamidophos led to severe changes in the cell structure, including the karyotheca dissolved, the nucleolus, and the endoplasmic reticulum disappeared. These may contribute to changes in proteinase activity of spider. This work documents a feasible method for rapid and reliable detection of proteinase activity. © The Author(s) 2018. Published by Oxford University Press on behalf of Entomological Society of America. All rights reserved.

语种： 英文

作者： Luo, Longzao;Lin, Xiaoai;Zeng, Fanjian;Luo, Shuang;Chen, Zongbao;...

期刊： Bioresource Technology,2019年272:421-432 ISSN：0960-8524

通讯作者： Tian, Guangming

作者机构： [Chen, Zongbao; Luo, Longzao] Shangrao Normal Univ, Sch Chem & Environm Sci, Shangrao 334001, Peoples R China.;[Luo, Longzao; Tian, Guangming; Zeng, Fanjian] Zhejiang Univ, Dept Environm Engn, Coll Environm & Resource Sci, Hangzhou 310058, Zhejiang, Peoples R China.;[Lin, Xiaoai] Shangrao Normal Univ, Coll Life Sci, Shangrao 334001, Peoples R China.;[Luo, Shuang] Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Hunan, Peoples R China.

通讯机构： [Tian, Guangming] Z;Zhejiang Univ, Dept Environm Engn, Coll Environm & Resource Sci, Hangzhou 310058, Zhejiang, Peoples R China.

关键词： Nutrient recovery;Operation parameters;Photobioreactors;Piggery biogas slurry

摘要： Photobioreactor is deemed to be one of limiting factors for the commercial application of wastewater treatment based on microalgae cultivation. In this study, a novel Flat-Plate Continuous Open Photobioreactor (FPCO-PBR) was developed to treat piggery biogas slurry. The operation parameters, microbial stability and nutrient recovery potential of FPCO-PBR were investigated. Results showed that the appropriate influent mode for FPCO-PBR was multi-point or spraying mode. The optimal hydraulic retention time and interval time for biomass harvesting of FPCO-PBR were both 2 d. Nitrogen and phosphorus recovery rate were 30 mg L−1 d−1 and 7 mg L−1 d−1 respectively under optimal operating parameters. Microbial diversity remained relatively stable in FPCO-PBR. Biomass production rate of FPCO-PBR was 0.47 g L−1 d−1 under optimal operating parameters. The revenue generated from biomass was estimated to be 15.06 $ kg−1, which means that treating one ton of wastewater can generate $ 7.08 in revenue. © 2018 Elsevier Ltd

语种： 英文

作者： 向宇佳;田琳;刘晓成;何洋州;罗琳;...

作者机构： [向宇佳; 田琳; 刘晓成; 何洋州; 罗琳; 周耀渝] 湖南农业大学资源环境学院

会议名称： 《环境工程》2019年全国学术年会

会议时间： 2019-08-30

会议地点： 中国北京

关键词： 电芬顿反应;降解;铜绿微囊藻

摘要： 电芬顿反应因为操作简便、氧化能力强并且无二次污染等优点,越来越多应用于降解污水中的难降解有机物。本研究通过电芬顿反应并简单添加Cu2+来显著增强铜绿微囊藻的降解。除了电芬顿反应与Cu2+的关系,本文还探究溶液初始pH值、电流大小对降解铜绿微囊藻影响以及藻类细胞中有机质和色素在降解过程中的变化。结果表明:在溶液初始pH=3的经典芬顿体系中,铜绿微囊藻的降解率在1 h内达到87. 9%;在自然pH的芬顿体系中,铜绿微囊藻的降解率在1 h内达到63. 1%。同时,发现较高电流不利于芬顿反应的进行,铜绿微囊藻密度下降趋势与UV值下降趋势相似,认为铜绿微囊藻通过有机质流出,裂解死亡。本研究为降解铜绿微囊藻提供了一种新的、环保的、有前景的替代方案。

语种： 中文

作者： Mao, Qiming;Zhou, Yaoyu;Yang, Yuan;Zhang, Jiachao;Liang, Lifen;...

期刊： Journal of Hazardous Materials,2019年380:120848 ISSN：0304-3894

通讯作者： Luo, Shuang;Luo, Lin

作者机构： [Mao, Qiming; Yang, Yuan; Luo, Shuang; Luo, Lin; Zhou, Yaoyu; Zhang, Jiachao] Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Hunan, Peoples R China.;[Liang, Lifen] Foshan Univ, Sch Environm & Chem Engn, Foshan 528000, Peoples R China.;[Wang, Hailong] Foshan Univ, Sch Environm & Chem Engn, Biochar Engn Technol Res Ctr Guangdong Prov, Foshan, Guangdong, Peoples R China.;[Wang, Hailong] Zhejiang A&F Univ, Sch Environm & Resource Sci, Key Lab Soil Contaminat Bioremediat Zhejiang Prov, Hangzhou 311300, Zhejiang, Peoples R China.;[Jeyakumar, Paramsothy] Massey Univ, Sch Agr & Environm, Environm Sci, Private Bag 11 222, Palmerston North 4442, New Zealand.

通讯机构： [Luo, S; Luo, L] H;Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Hunan, Peoples R China.

关键词： Antibiotics;Atoms;Chemical activation;Density functional theory;Iron;Nanotechnology;Oxidation;Rate constants;Advanced Oxidation Processes;Bio chars;Fluoroquinolone antibiotics;Hydrogen atom abstraction;Nano-scale zero valent irons;Supported nanoscale zero-valent irons;Theoretical approach;Theoretical calculations;Chemicals removal (water treatment);biochar;charcoal;ciprofloxacin;hydrogen;hydrogen peroxide;hydroxyl radical;iron nanoparticle;unclassified drug;water;antiinfective agent;biochar;ciprofloxacin;hydrogen peroxide;iron;metal nanoparticle;aqueous solution;biochar;chemical compound;experimental study;hydrogen peroxide;iron nanoparticle;oxidation;pollutant removal;theoretical study;water treatment plant;activated sludge;aqueous solution;Article;calculation;chemical analysis;chemical reaction;comparative study;controlled study;degradation kinetics;environmental temperature;nonhuman;oxidation kinetics;surface area;waste component removal;water treatment;chemistry;isolation and purification;oxidation reduction reaction;pH;scanning electron microscopy;solution and solubility;temperature;water pollutant;Anti-Bacterial Agents;Charcoal;Ciprofloxacin;Hydrogen Peroxide;Hydrogen-Ion Concentration;Iron;Metal Nanoparticles;Microscopy, Electron, Scanning;Oxidation-Reduction;Solutions;Temperature;Water Pollutants, Chemical

摘要： Ciprofloxacin has been frequently detected in water environment, and its removal has become a significant public concern. Biochar-supported nanoscale zero-valent iron (BC/nZVI) to activate hydrogen peroxide (H2O2) has many advantages on promoting the removal of organic contaminants. In this paper, the BC/nZVI activating H2O2 degradation of ciprofloxacin was systematically investigated by experimental and theoretical approaches. The morphologies and property analysis showed that nZVI particles distributed uniformly on the biochar surface, which mainly include −OH, &gt;C[dbnd]O and C[sbnd]O[sbnd]C and C[sbnd]O groups. Different reaction conditions were compared to define the optimal conditions for ciprofloxacin removal in BC/nZVI/H2O2 system. More than 70% of ciprofloxacin was removed in the optimal conditions: acidic condition (pH 3∼4), low doses of H2O2 (20 mM), and temperature of 298 K. The hydroxyl radical (•OH) oxidation was the primary pathway in BC/nZVI/H2O2 degradation of ciprofloxacin process. The theoretical calculation indicated that hydrogen atom abstraction (HAA) pathways were the dominant oxidation pathways contributing 92.3% in overall second‒order rate constants (k) of •OH and ciprofloxacin. The current results are valuable to evaluate the application of BC/nZVI activating H2O2 degradation of ciprofloxacin and other fluoroquinolone antibiotics in water treatment plants. © 2019 Elsevier B.V.

语种： 英文