作者： Gong, Xiaomin*;Huang, Danlian*;Liu, Yunguo;Zou, Dongsheng;Hu, Xi;...

期刊： Ecotoxicology and Environmental Safety,2021年208:111510 ISSN：0147-6513

通讯作者： Gong, Xiaomin;Huang, Danlian

作者机构： [Xiao, Zhihua; Wu, Zhibin; Gong, Xiaomin; Zou, Dongsheng; Yang, Yang] Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Peoples R China.;[Xiao, Zhihua; Wu, Zhibin; Gong, Xiaomin; Zou, Dongsheng; Yang, Yang] Key Lab Rural Ecosyst Hlth Dongting Lake Area Hun, Changsha 410128, Peoples R China.;[Huang, Danlian; Liu, Yunguo] Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Peoples R China.;[Hu, Xi] Cent South Univ Forestry & Technol, Coll Environm Sci & Engn, Changsha 410004, Peoples R China.;[Zhou, Lu] Changsha Univ Sci & Technol, Sch Hydraul Engn, Changsha 410114, Peoples R China.

通讯机构： [Gong, Xiaomin; Huang, Danlian] H;Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Peoples R China.;Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Peoples R China.

关键词： Plant growth;Cadmium accumulation;Cd fractions;Sediments properties;Bacterial community

摘要： Environment functional materials have been widely used, but whether their effects on the contaminated environment could facilitate phytoremediation is not yet well understood. In this study, starch stabilized nanoscale zerovalent iron (SN), multiwall carbon nanotubes (MW) and tea waste derived biochar (TB) were used to facilitate the phytoremediation of cadmium (Cd) contaminated sediments by Boehmeria nivea (L.) Gaudich. Results showed that 100 mg/kg SN, 500 mg/kg MW and 500 mg/kg TB facilitated phytoremediation, as evidenced by increasing Cd accumulation and/or promoting plant growth. These concentrations of materials increased the reducible fraction of Cd by 9–10% and decreased the oxidizable proportion of Cd by 48–52%, indicating the improvement of Cd bioavailability through converting the oxidizable Cd into reducible form. The activities of urease, phosphatase and catalase, which related to nutrient utilization and oxidative stress alleviation, increased by 20–24%, 25–26%, and 8–9% in the sediments treated with 500 mg/kg MW and 500 mg/kg TB, respectively. In addition, the 16S rRNA gene sequence results showed that these concentrations of materials changed the bacterial diversity. The abundance of Acidobacteria, Actinobacteria, Nitrospirae and Firmicutes were increased by some of the applied materials, which could promote plant growth, change Cd bioavailability and reduce Cd toxicity. These findings indicated that the applied environment functional materials could facilitate the phytoremediation of Cd contaminated environment by changing Cd fractions, sediments properties and bacterial community structure. © 2020 The Authors

语种： 英文

作者： Deng, Xiao;Chen, Yixuan;Yang, Yang;Lu, Lei;Yuan, Xiaoqing;...

期刊： Environmental Pollution,2020年262(Jul.):114289 ISSN：0269-7491

通讯作者： Zeng, Qingru

作者机构： [Zeng, Hongyuan; Yuan, Xiaoqing; Zeng, Qingru; Deng, Xiao; Yang, Yang; Chen, Yixuan; Lu, Lei] Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Peoples R China.;[Zeng, Hongyuan; Zeng, Qingru; Yang, Yang] Hunan Agr Univ, Coll Biosci & Biotechnol, Changsha 410128, Peoples R China.

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

关键词： Rice;Cadmium;Alkaline fertilizer;Topdressing;Manganese fertilizer

摘要： Rice is a main source of dietary cadmium (Cd), thus, how to reduce the Cd concentration in brown rice has received extensive attention worldwide. In three acidic paddy soils slightly to moderately contaminated with Cd, a series of field experiments were conducted to evaluate the effects of different proportions of nitrogen-phosphorus-potassium (N-P-K) fertilizer (urea, calcium magnesium phosphate, and potassium carbonate, respectively) alone or coupled with a topdressing of manganese (Mn) fertilizer at the tillering stage on reducing Cd bioavailability in soil and uptake in rice. The rational application of NP-K fertilizer not only provided the basic nutrients to promote the normal growth of rice but also increased soil pH and thereby reduced the Cd bioavailability in soil. The Mg(NO3)(2)-extracted Cd concentrations in the three soils were reduced by 26.46-56.53%, while TCLP-extracted Cd were reduced by 19.87-45.41%, with little influence on soil cation exchange capacity (CEC) and organic matter (OM). The application of Mn fertilizer at the tillering stage increased Mn and Cd sequestration in the iron plaque. The Mn content in iron plaque increased by 15.71-58.67% and a significant positive correlation between Cd and Mn was observed at the three sites. Collectively, this combined method of fertilization significantly reduced Cd accumulation in rice tissues, the Cd concentrations in roots of treated plants decreased by 11.18-37.78%, whereas the concentrations in straw decreased by 13.16-41.03%. Particularly to brown rice, in which accumulation decreased by 25.19-44.70%, 37.35-47.84%, and 38.00-60.88% in three typical paddy fields, but no significant effect was observed for the Cd translocation factors (TF) among rice tissues. Thus, the basal application of combined urea and alkaline inorganic fertilizers followed by topdressing of Mn fertilizer may be a promising and cost- effective tactics for the remediation of Cdcontaminated paddy soils. (C) 2020 Elsevier Ltd. All rights reserved.

语种： 英文

作者： Luo, Jin-Song;Xiao, Yan;Yao, Junyue;Wu, Zhimin;Yang, Yong;...

期刊： FRONTIERS IN PLANT SCIENCE,2020年11:503982 ISSN：1664-462X

通讯作者： Zhang, Zhenhua

作者机构： [Xiao, Yan; Luo, Jin-Song; Zhang, Zhenhua; Yao, Junyue; Wu, Zhimin; Yang, Yong] Hunan Agr Univ, Southern Reg Collaborat Innovat Ctr Grain & Oil C, Coll Resources & Environm Sci, Changsha, Peoples R China.;[Xiao, Yan; Luo, Jin-Song; Zhang, Zhenhua; Yao, Junyue; Wu, Zhimin; Yang, Yong] Hunan Prov Key Lab Nutr Common Univ, Hunan Prov Key Lab Farmland Pollut Control & Agr, Natl Engn Lab Soil & Fertilizer Resources Efficie, Changsha, Peoples R China.;[Ismail, Abdelbagi M.] Int Rice Res Inst, Manila, Philippines.

通讯机构： [Zhang, Zhenhua] H;Hunan Agr Univ, Southern Reg Collaborat Innovat Ctr Grain & Oil C, Coll Resources & Environm Sci, Changsha, Peoples R China.;Hunan Prov Key Lab Nutr Common Univ, Hunan Prov Key Lab Farmland Pollut Control & Agr, Natl Engn Lab Soil & Fertilizer Resources Efficie, Changsha, Peoples R China.

关键词： plant defensin;CAL2;Cadmium accumulation;Arabidopsis;rice

摘要： Accumulation and detoxification of cadmium in rice shoots are of great importance for adaptation to grow in cadmium contaminated soils and for limiting the transport of Cd to grains. However, the molecular mechanisms behind the processes involved in this regulation remain largely unknown. Defensin proteins play important roles in heavy metal tolerance and accumulation in plants. In rice, the cell wall-localized defensin protein (CAL1) is involved in Cd efflux and partitioning to the shoots. In the present study, we functionally characterized the CAL2 defensin protein and determined its contribution to Cd accumulation. CAL2 shared 66% similarity with CAL1, and its mRNA accumulation is mainly observed in roots and is unaffected by Cd stress, but its transcription level was lower than that of CAL1 based on the relative expression of CAL2/Actin1 observed in this study and that reported previously. A promoter-GUS assay revealed that CAL2 is expressed in root tips. Stable expression of the CAL2-mRFP fusion protein indicated that CAL2 is also localized in the cell walls. An in vitro Cd binding experiment revealed that CAL2 has Cd chelation activity. Overexpression of CAL2 increased Cd accumulation in Arabidopsis and rice shoots, but it had no effect on the accumulation of other essential elements. Heterologous expression of CAL2 enhanced Cd sensitivity in Arabidopsis, whereas overexpression of CAL2 had no effect on Cd tolerance in rice. These findings indicate that CAL2 positively regulates Cd accumulation in ectopic overexpression lines of Arabidopsis and rice. We have identified a new gene regulating Cd accumulation in rice grain, which would provide a new genetic resource for molecular breeding.

语种： 英文

作者： 杨勇;李晗;旦增;云丹佳措;陈革明;...

期刊： 大麦与谷类科学,2020年37(03):35-40 ISSN：1673-6486

作者机构： 湖南农业大学资源环境学院/农田污染控制与农业资源利用湖南省重点实验室,湖南长沙410128;湖南华绿生物科技有限公司,湖南湘潭411200;西藏自治区日喀则市白朗县农牧综合服务中心,西藏日喀则857000;西藏珠峰华绿生态农业科技有限公司,西藏日喀则857000;[荣湘民; 杨勇] 湖南农业大学

关键词： 青稞;商品有机肥;肥料利用率;产量;有机质

摘要： 采用田间小区试验,研究商品有机肥对青稞产量和养分利用效率的影响。结果表明,随着商品有机肥施用量的增加,青稞籽粒产量呈先增加后减少的趋势。供试商品有机肥施肥量为2 250 kg/hm2时籽粒产量最高,达到5 007.5 kg/hm2,增产幅度为66.2%。氮磷钾肥利用率都随着商品有机肥施用量的增加呈先缓慢升高后快速降低的趋势,最高分别增加7.51、3.13、17.67百分点。由此说明增施商品有机肥可明显增加土壤速效养分含量和有机质含量,对土壤p H值影响不大。综合分析,青稞施用供试商品有机肥,推荐适宜施用量为1 500～2 250 kg/hm2。

语种： 中文

作者： 杨勇;李晗;旦增;云丹佳措;陈革明;...

期刊： 西藏农业科技,2020年42(04):52-56 ISSN：1005-2925

作者机构： 湖南农业大学资源环境学院/土壤肥料资源高效利用国家工程实验室/农田污染控制与农业资源利用湖南省重点实验室,湖南长沙410128;湖南华绿生物科技有限公司,湖南湘潭411200;白朗县农牧综合服务中心,西藏日喀则857000;西藏珠峰华绿生态农业科技有限公司,西藏日喀则857000;[荣湘民; 杨勇] 湖南农业大学

关键词： 青稞;有机肥;养分吸收;产量

摘要： 采用田间小区试验,研究'珠峰4000'商品有机肥对青稞氮磷钾养分吸收和籽粒产量的影响.结果表明:增施商品有机肥青稞产量明显增加,随着施肥量的增加,青稞籽粒产量呈先增加后减少的趋势,施肥量为2250 kg/hm2时产量最高,达到5007.5 kg/hm2,增产幅度达到66.2 ％;有效穗、穗粒数和结实率明显增加,千粒重增幅较小;养分含量增加不明显,而养分积累量显著增加.籽粒产量与养分积累量呈显著正相关关系,而与养分含量呈负相关关系;产量构成因素各指标都与产量呈正相关,但只有穗粒数达到极显著相关.

语种： 中文

作者： Cao, Lin-Ying*;Xu, Yun-Hao;He, Sen;Ren, Xiao-Min;Yang, Yuan;...

期刊： ENVIRONMENTAL SCIENCE & TECHNOLOGY LETTERS,2020年7(6):434-439 ISSN：2328-8930

通讯作者： Cao, Lin-Ying;Luo, Lin

作者机构： [Xie, Xian-De; Yang, Yuan; Xu, Yun-Hao; Cao, Lin-Ying; Cao, LY; Luo, Lin; Luo, Shuang; He, Sen] Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Peoples R China.;[Ren, Xiao-Min] Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Environm Chem & Ecotoxicol, Beijing 100085, Peoples R China.

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

摘要： Triclosan (TCS) and triclocarban (TCC) are two widely used antimicrobial agents that have been reported to be estrogenic disruptors. Previous researches have shown that TCC and TCS exhibit weak or no agonistic activity on classical estrogen receptors. We demonstrate first in the present study that TCS and TCC disrupt the estrogen system via the estrogen-related receptor γ(ERRÎ) at human exposure levels. The fluorescence competitive binding assay showed that TCC had approximately 9-fold higher binding affinity with ERRγthan TCS. TCS and TCC demonstrated higher binding potency with ERRγthan a synthetic ERRγagonist GSK4716, with a dissociation constant of 886 ± 141 and 96 ± 10 nM, respectively. By using the reporter gene assay, we found that TCS and TCC exerted agonistic activity toward ERRÎ, with the lowest observed effective concentration of 100 and 10 nM, respectively. Molecular docking showed that TCS and TCC tended to present an ERRγagonistic binding mode, and TCC exhibited lower binding energy than TCS, which provided a good theoretical explanation for our experimental observations. Our results revealed a novel mechanism for the estrogenic disruption of TCS and TCC, demonstrating that TCC deserves more attention in future research due to its higher activity. Copyright © 2020 American Chemical Society.

语种： 英文

作者： Gao, Lingwei;Mao, Qiming;Luo, Shuang*;Cao, Linying;Xie, Xiande;...

期刊： Environmental Pollution,2020年259:113795 ISSN：0269-7491

通讯作者： Luo, Shuang;Wei, Zongsu

作者机构： [Xie, Xiande; Mao, Qiming; Yang, Yuan; Cao, Linying; Luo, Shuang; Gao, Lingwei] Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Peoples R China.;[Gao, Lingwei] Cent South Univ, Sch Met & Environm, Inst Environm Engn, Changsha 410083, Peoples R China.;[Deng, Yunfeng] Tianjin Univ, Sch Mat Sci & Engn, Tianjin 300072, Peoples R China.;[Deng, Yunfeng] Tianjin Univ, Tianjin Key Lab Mol Optoelect Sci, Tianjin 300072, Peoples R China.;[Wei, Zongsu] Aarhus Univ, Ctr Water Technol WATEC, Dept Engn, Hangovej 2, DK-8200 Aarhus N, Denmark.

通讯机构： [Luo, Shuang] H;[Wei, Zongsu] A;Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Peoples R China.;Aarhus Univ, Ctr Water Technol WATEC, Dept Engn, Hangovej 2, DK-8200 Aarhus N, Denmark.

关键词： Advanced oxidation;Hydroxyl radical;Sulfamethoxazole;Sulfate radical;Theoretical calculation

摘要： This study provides insights into the similarities and differences of degradation reactions by •OH/[Formula presented] at the molecular level for improved antibiotics removal. © 2019 Elsevier LtdHydroxyl radical (•OH)- and sulfate radical ([Formula presented])-based advanced oxidation technologies (AOTs) have been proven an effective method to remove antibiotics in wastewater treatment plants (WWTPs). This study aims to gain insights into kinetics and mechanisms of neutral sulfamethoxazole (SMX) degradation, a representative antibiotic, by •OH and [Formula presented] using an experimental and theoretical approach. First, the second-order rate constants (k) of SMX with •OH and [Formula presented] were determined to be (7.27 ± 0.43) × 109 and (2.98 ± 0.32) × 109 M−1 s−1 in UV/H2O2 and UV/persulfate (UV/PS) systems, respectively. The following theoretical calculations at the M06–2X level of theory revealed that addition of radicals to the benzene ring is the most favorable first-step reaction for both •OH and [Formula presented], but that [Formula presented] exhibits higher energy barriers and selectivity than •OH due to steric hindrance. We further analyzed subsequent reactions and, interestingly, our findings closely corroborated HOMO/LUMO distributions of SMX to the oxidation pathways. Finally, the estimation of energy consumption for UV alone, •OH–, and [Formula presented]–mediated oxidation processes was compared. These comparative results, for the first time, provide insights into the similarities and differences of degradation of SMX by •OH/[Formula presented] at the molecular level and can help improve antibiotics removal using radical based AOTs in WWTPs. © 2019 Elsevier Ltd

语种： 英文

作者： Deng, Xiao;Yang, Yang;Zeng, Hongyuan;Chen, Yixuan;Zeng, Qingru*

期刊： Journal of Hazardous Materials,2020年384:121343 ISSN：0304-3894

通讯作者： Zeng, Qingru

作者机构： [Zeng, Hongyuan; Zeng, Qingru; Deng, Xiao; Yang, Yang; Chen, Yixuan] Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Peoples R China.;[Zeng, Hongyuan; Zeng, Qingru; Yang, Yang] Hunan Agr Univ, Coll Biosci & Biotechnol, Changsha 410128, Peoples R China.

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

关键词： Bioaccumulation;Biochemistry;Heavy metals;Iron;Pollution;Soils;Heavy metal accumulation;Heavy metal pollution;Iron plaques;Oryza sativa;Rice (Oryza sativa L.);Root morphology;Seedling establishment;Seedling transplanting;Morphology;cadmium;iron;lead;cadmium;iron;lead;metal;bioaccumulation;bioavailability;cadmium;concentration (composition);experimental study;heavy metal;iron;lead;reduction;rice;root architecture;seedling establishment;agronomic trait;bioavailability;biomass;cadmium poisoning;comparative study;concentration (parameter);controlled study;environmental impact;field experiment;lead poisoning;nonhuman;phytotoxicity;plant parameters;plant tissue;pollution;rice;root average diameter;root growth;root length;root morphology;runoff;seedling establishment;shoot growth;soil acidity;soil analysis;soil property;surface area;anatomy and histology;bioavailability;chemistry;food grain;growth, development and aging;metabolism;Oryza;plant root;rhizosphere;seedling;soil pollutant;Oryza sativa;Biological Availability;Cadmium;Edible Grain;Iron;Lead;Metals;Oryza;Plant Roots;Rhizosphere;Seedlings;Soil Pollutants

摘要： Global rice production is undergoing a shift from traditional seedling transplanting to direct seeding. There are also serious global challenges caused by heavy metal pollution in grain. To evaluate heavy metal accumulation in rice under different seedling establishment methods, we conducted field experiments with manual transplanting (MT), seedling throwing (ST) and direct seeding (DS). Data revealed that DS method enhances cadmium (Cd) and lead (Pb) accumulation in roots, straw, and brown rice. In particular, the Cd concentration in DS brown rice was 35.4% and 22.5% higher than in MT and ST methods, respectively; the concentration of Pb in DS brown rice was 1.97 times higher than in MT. The reasons for these observations are that DS rice root systems have finer diameters, larger specific surface areas, larger specific root lengths, more root tips, and reducing Fe plaque formation on root surface while DS rice roots formed in the upper soil layer and exhibited higher Cd and Pb bioactivity within the rhizosphere soil. Collectively, here we show for the first time that the shift in seedling establishment methods from transplanting to direct seeding also have played a partial contribution in the observed increased severity of heavy metal pollution in rice levels. © 2019 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： Gao, Yu-Pei;Yang, Yuan;Li, Lei;Wei, Wen-Jing;Xu, Hai;...

期刊： Analytica Chimica Acta,2020年1110:72-81 ISSN：0003-2670

通讯作者： Wang, Qiang;Qiu, Ya-Qun

作者机构： [Gao, Yu-Pei; Wei, Wen-Jing; Xu, Hai; Wang, Qiang; Li, Lei] Cent South Univ, Coll Chem & Chem Engn, Changsha 410083, Hunan, Peoples R China.;[Gao, Yu-Pei; Wei, Wen-Jing; Wang, Qiang; Li, Lei] Cent South Univ, Coll Chem & Chem Engn, Ctr Environm & Water Resources, 932 Lushan Nan Rd, Changsha 410083, Peoples R China.;[Gao, Yu-Pei; Wei, Wen-Jing; Wang, Qiang; Li, Lei] Cent South Univ, Ey Lab Hunan Prov Water Environm & Agr Prod Safet, Changsha 410083, Hunan, Peoples R China.;[Yang, Yuan] Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Peoples R China.;[Yang, Yuan] Hunan Agr Univ, Int Joint Lab Hunan Agr Typ Pollut Restorat & Wat, Changsha 410128, Peoples R China.

通讯机构： [Wang, Qiang] C;[Qiu, Ya-Qun] H;Cent South Univ, Coll Chem & Chem Engn, Changsha 410083, Hunan, Peoples R China.;Hunan Res Acad Environm Sci, Changsha 410004, Hunan, Peoples R China.

关键词： Extract gold nanoparticle;Organic matter;Sediment;Soil;UV digestion

摘要： Ever-growing application of engineering nanoparticles in many sectors of the society requires efficient methods to extract them from soil and sediment, for the sake of environmental protection. In this study, we develop a new method which uses sodium pyrophosphate solution (TSPP, Na4P2O7) as extratant to extract gold nanoparticle (AuNPs) from soil and sediment under optimized parameters through vortexing, water bath oscillation, ultrasonic bath and precipitation. SP-ICP-MS was used for the detection of number concentration, mass concentration and size distribution of AuNPs in soil. UV irradiation was innovatively used to directly degrade soil organic matter to improve the recovery of AuNPs due to their low recovery rate in rich organic soils. It could be found that the mass fraction recovery increased from 36% (without UV digestion) to 83% (with 48h UV digestion). The extraction method is versatile for different coating layers and wide-ranging particle sizes in real soil and sediment. Therefore, the rapid and efficient characterization and quantification of AuNPs in soil and sediment are achieved, and the researches on the extraction method of AuNPs and their behavior and toxicity assessment in soil environment can be enriched. © 2020 Elsevier B.V.

语种： 英文

作者： Yang, Ruijia;Tao, Jie;Huang, Qiaoyun;Tie, Boqing*;Lei, Ming;...

期刊： Journal of Soils and Sediments,2019年19(3):1319-1327 ISSN：1439-0108

通讯作者： Tie, Boqing;Du, Huihui

作者机构： [Tao, Jie; Tie, BQ; Du, HH; Yang, Yuan; Tie, Boqing; Du, Huihui; Lei, Ming; Yang, Ruijia] Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Hunan, Peoples R China.;[Huang, Qiaoyun; Du, Huihui] Huazhong Agr Univ, Coll Resources & Environm, Wuhan 430070, Hubei, Peoples R China.

通讯机构： [Tie, BQ; Du, HH; Du, Huihui] H;Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Hunan, Peoples R China.;Huazhong Agr Univ, Coll Resources & Environm, Wuhan 430070, Hubei, Peoples R China.

关键词： adsorption;anoxic conditions;antimony;cadmium;detection method;ferrihydrite;heavy metal;metalloid;pH;soil nutrient;sorption;thermodynamics

摘要： Purpose: Heavy metal and metalloid commonly coexist in soils and sediments, and interact frequently with various minerals. The coexistence of Sb and Cd is commonly observed in Sb mine area, but their co-adsorption behaviors to soil minerals still remain poorly understood. This study aimed to elucidate the co-adsorption characteristics of Cd(II) and Sb(III) by ferrihydrite (Fh) under anoxic condition. Materials and methods: Batch experiments were performed to determine the sorption capacity of Cd(II) and Sb(III) in both single and binary systems. The major functional groups that were responsible for Cd(II) and Sb(III) sorption were determined by X-ray photoelectron spectroscopy (XPS), while the thermodynamic sorption mechanisms were elucidated using isothermal titration calorimetry. Results and discussion: Cd(II) sorption on Fh increases with increasing pH levels (4–8) whereas Sb(III) sorption shows less variation with pH level variations. The Langmuir adsorption capacity is 55.54mg/g for Cd(II) and 188.19mg/g for Sb(III). In Cd–Sb binary systems, Cd(II) sorption is significantly diminished whereas Sb(III) uptake is close to single Sb(III) sorption. XPS indicates the Fe–OH groups are mainly responsible for the binding of Cd and Sb, possibly through the formation of inner-sphere complexes. This hypothesis is further confirmed by the positive entropy (ΔS) after Cd and/or Sb binding. A larger ΔS in the binary Cd–Sb titration than in their single titrations implies the formation of a ternary Fh–Sb–Cd complex, which results in a higher disorder of the sorption system. Conclusions: The presence of Sb(III) reduces Cd(II) sorption whereas Cd(II) has a negligible effect on Sb(III) sorption to ferrihydrite; moreover, Sb(III) and Cd(II) might form surface ternary complexes in binary systems. These new findings have important implications for predicting the sequestration, migration, and fate of Cd and Sb in soils. © 2018, Springer-Verlag GmbH Germany, part of Springer Nature.

语种： 英文

作者： 文炯;蒋建为;傅岳峰;许望龙;王伟政;...

期刊： 湖南农业科学,2019年(06):47-50 ISSN：1006-060X

作者机构： 岳阳市农业科学研究院,农业部岳阳农业环境科学观测实验站,湖南 岳阳 414000;湖南农业大学资源环境学院,农田污染控制与农业资源利用湖南省重点实验室,湖南 长沙 410128;[蒋建为; 文炯; 傅岳峰; 王伟政; 陈鸽; 许望龙; 陈慕文] 岳阳市农业科学研究院;[杨勇] 湖南农业大学

关键词： 水稻;多效唑;品质;产量

摘要： 采用田间小区试验,研究了不同多效唑和氮肥用量对水稻品种盛泰优018产量和品质的影响。结果表明:适量增施氮肥可增加水稻有效穗数和每穗总粒数,提高籽粒产量,对稻米品质影响较小。施用多效唑,水稻籽粒产量明显增加,增产幅度最高可达3.1%,有效穗数、每穗总粒数、结实率和千粒重均有小幅增加,但用量过大时会减少有效穗数;适量施用多效唑可提高稻米品质,稻米整精米率明显提高,直链淀粉含量和胶稠度小幅上升,垩白粒率和垩白度所有降低;株高随多效唑用量增加明显降低,增强水稻抗倒伏能力。适量增施氮肥和多效唑可提高盛泰优018的产量,改善稻米品质。

语种： 中文

作者： 文炯;石敦杰;荣湘民;田昌;杨勇

期刊： 作物研究,2019年33(4):309-314+326 ISSN：1001-5280

作者机构： 湖南农业大学资源环境学院/土壤肥料资源高效利用国家工程实验室,长沙410128;岳阳市农业科学研究院/农业农村部岳阳农业环境科学观测实验站,湖南岳阳414000;湖南农业大学资源环境学院/土壤肥料资源高效利用国家工程实验室,长沙,410128;[荣湘民; 文炯; 杨勇; 田昌; 石敦杰] 湖南农业大学

关键词： 生态沟渠;氮磷消纳;水生植物;生物拦截

摘要： 构建生态沟渠消纳水体氮磷是防控农业面源污染的重要措施。为筛选出适应湘北洞庭湖区农区沟渠生长的高富集氮、磷植物,选取津市市毛里湖稻区沟渠作为研究对象,进行生态沟渠拦截试验。于2016～2017年连续监测,系统研究狐尾藻、珍珠梅、海寿花等水生植物及组合对小流域农田排水中氮、磷的去除效果。结果表明:2年观测期（4～8月）内,拦截植物对农田排水总氮、铵态氮、硝态氮及总磷的去除率效应极显著（p <0. 01）,且去除率具有生长变化趋势。不同拦截植物及组合对总氮、铵态氮、硝态氮及总磷的去除率大小表现为狐尾藻+海寿花>海寿花>珍珠梅>狐尾藻>自然植被。其中,狐尾藻+海寿花组合平均总氮、铵态氮、硝态氮及总磷的去除率2016年分别为53. 57%、77. 35%、51. 74%和61. 06%,2017年分别为34. 67%、66. 53%、39. 51%和46. 05%。研究区生态沟渠对氮、磷污染物有较好的拦截效应,单种植物以海寿花的水体氮磷消纳效果较好,在此基础上混种狐尾藻,效果更佳。

语种： 中文

作者： Liu, Xiangrong;Liao, Jiayuan;Song, Haixing;Yang, Yong;Guan, Chunyun;...

期刊： Scientific Reports,2019年9(1) ISSN：2045-2322

通讯作者： Zhang, Zhenhua

作者机构： [Guan, Chunyun; Song, Haixing; Liu, Xiangrong; Zhang, Zhenhua; Liao, Jiayuan; Yang, Yong] Hunan Agr Univ, Coll Resources & Environm Sci, Southern Reg Collaborat Innovat Ctr Grain & Oil C, Changsha 410128, Hunan, Peoples R China.;[Liu, Xiangrong] Hunan Qidong Country Tobacco Co, Hengyang 421600, Peoples R China.;[Song, Haixing; Liu, Xiangrong; Zhang, Zhenhua; Liao, Jiayuan; Yang, Yong] Natl Engn Lab Soil & Fertilizer Resources Efficie, Changsha 410128, Hunan, Peoples R China.

通讯机构： [Zhang, Zhenhua] H;[Zhang, Zhenhua] N;Hunan Agr Univ, Coll Resources & Environm Sci, Southern Reg Collaborat Innovat Ctr Grain & Oil C, Changsha 410128, Hunan, Peoples R China.;Natl Engn Lab Soil & Fertilizer Resources Efficie, Changsha 410128, Hunan, Peoples R China.

摘要： Biochar-based fertilizers have attracted increased attention, because biochar can improve the soil fertility, promote plant growth and crop yield. However, biochar-based controlled release nitrogen fertilizers (BCRNFs) still face problems because of the high cost, inefficient production technology, instability of nitrides, and the challenge associated with the controlled release of nutrients. In this study, we hydrothermally synthesised novel BCRNFs using urea-loaded biochar, bentonite and polyvinyl alcohol for controlled release of nutrients. Scanning electron microscopy and gas adsorption were conducted to identify the urea-loading and storage of bentonite in the inner pores of the biochar particles. X-ray diffraction, Fourier transform infrared spectroscopic and X-ray photoelectron spectroscopic studies demonstrated that strengthening the interactions among biochar, urea, and bentonite, helps control the moisture diffusion and penetration of bentonite, thereby leading to nutrient retention. The BCRNF showed significantly improved nutrient release characteristic compared with that of a mixture of biochar and urea. This urea-bentonite composite loaded with urea provides control over the release of nutrients stored in the biochar. BCRNF, especially those produced hydrothermally, can have potential applications in sustainable food security and green agriculture.

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： Zhan, Faqi;Wang, Keke;Yang, Xuetao;Liu, Yisi;Yang, Yahui;...

期刊： Electrochimica Acta,2019年306:96-105 ISSN：0013-4686

通讯作者： Li, Jie;Li, Wenzhang

作者机构： [Zhan, Faqi; Li, Jie; Yang, Xuetao; Wang, Keke; Li, Wenzhang] Cent S Univ, Sch Chem & Chem Engn, Changsha 410083, Hunan, Peoples R China.;[Zhan, Faqi] Lanzhou Univ Technol, State Key Lab Adv Proc & Recycling Nonferrous Met, Lanzhou 730050, Gansu, Peoples R China.;[Yang, Yahui] Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Hunan, Peoples R China.;[Liu, Yisi] Hubei Normal Univ, Inst Adv Mat, Huangshi 415000, Hubei, Peoples R China.;[Li, Dongwei] Chongqing Univ Educ, Div Sci Res Management, Chongqing 400065, Peoples R China.

通讯机构： [Li, J; Li, WZ] C;Cent S Univ, Sch Chem & Chem Engn, Changsha 410083, Hunan, Peoples R China.

关键词： WO3 plates;Heteropolyacid;In-situ;Photoelectrochemical;Less interfacial defects

摘要： The charge separation and transfer are critical steps during the photoelectrochemical processes. In this paper, we focus on the interfacial properties within the heteropolyacid (denoted as PW12) modified WO3 heterojunction film synthesized by an epitaxial growth method. The characterizations show that heteropolyacid is formed on the surface of WO3 plates with less interfacial defects between PW12 and WO3. The PW12/WO3 photoanodes synthesized via the in-situ method display a photocurrent density of 0.65 mA/cm(2) at 1.23 V vs. RHE, which exhibits 1.6 times as much as the bare WO3. And the composite achieves the maximum value of 1.52 mA/cm(2) at 1.8 V vs. RHE, while those of PW12/WO3 films prepared by a dip-coating method and pristine WO3 films are just 1.10 and 0.85mA/cm(2). The improvements in PEC performances of PW12/WO3 photoanodes (in-situ) were attributed to the higher electron transmission rate and longer electron lifetime resulted from the less interfacial defects. Moreover, the PW12/WO3 film was treated with TiCl4 solution to form a TiO2/PW12/WO3 ternary heterojunction, which exhibits a higher photocurrent density of 1.89 mA/cm(2). The current research has proposed a new perspective and method for the design of highly efficient heterojunction photoelectrodes and inorganic synthesis. (c) 2019 Elsevier Ltd. All rights reserved.

语种： 英文

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