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

期刊： Environmental Pollution,2021年281:116999 ISSN：0269-7491

通讯作者： Zeng, Qingru(qrzeng@163.com)

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

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

关键词： Arsenic;Growth stage;Rice seedling establishment;Root morphological indices

摘要： Understanding how the seedling establishment method affects arsenic (As) accumulation in rice is important for safe agricultural production. In a field experiment with three seedling establishment methods and two rice cultivars, the effects of direct seeding (DS), manual transplanting (MT), and seedling throwing (ST) on root morphological indices and the distribution, translocation, and accumulation of As in rice tissues across growth stages were compared. DS method resulted in the greatest accumulation of As in the two rice cultivars and led to more As distributed in aboveground tissues during the entire growth period. Especially in DS brown rice, the concentration of total As increased by 24.0%–40.8%, and that of inorganic As increased by 24.4%–40.0%, compared with the concentrations in MT and ST rice. A multiple regression model was developed with root morphological indices and the total As concentration in brown rice, and the R2 value of the model was 0.819, which was significant at the 1% level. Compared with the other establishment methods, the thinner diameters, smaller volumes, larger specific surface areas, and greater numbers of root tips in DS rice roots across growth stages promoted As uptake. The concentrations of As in root tips were approximately five times greater than those in the root base, and root tips were the key factor determining the difference in As accumulation in rice roots under the different seedling establishment methods. The results of this study demonstrate that the choice of an appropriate rice seedling establishment method is important to avoid the environmental consequences of As contamination and safely produce rice grain. Therefore, despite the current trend of increased use of DS, transplantation is recommended as a safer pattern of rice seedling establishment in As-contaminated areas. © 2021 Elsevier LtdDirect seeding method for rice production enhances the As accumulation in grain and transplanting should be promoted because it represents a safer way in As-contaminated areas. © 2021 Elsevier Ltd

语种： 英文

作者： Chai, Youzheng;Yang, Haochuan;Bai, Ma;Chen, Anwei;Peng, Liang;...

期刊： Bioresource Technology,2021年337:125421 ISSN：0960-8524

通讯作者： Chen, Anwei(A.Chen@hunau.edu.cn)

作者机构： [Wang, Xueqin; Yan, Binghua; Peng, Liang; Qin, Pufeng; Peng, Cheng; Yang, Haochuan; Chen, Anwei; Zhao, Danyang; Chai, Youzheng; Bai, Ma] Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Peoples R China.

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

关键词： 2, 5-furandicarboxylic acid;Biomass;Heavy metals transfer;MnO(2);Response surface method

摘要： In recent years, 2, 5-furandicarboxylic acid (FDCA) has attracted much attention as the precursor of bio-polyester materials. A coupled process of ultrasonic-assisted dilute acid pretreatment and MnO2 was designed in this study to directly produce FDCA from lignocellulosic biomass, which is different from the traditional preparation process. Moreover, the critical parameters in the process were analyzed and optimized by the response surface method. The yield of FDCA could reach 52.1% under the optimal conditions. The reaction mechanism indicated that heavy metal elements in lignocellulosic biomass could play the role of the Lewis acid catalyst to promote the formation of FDCA to a certain extent. With the increase of temperature, the heavy metals transfer in biomass from the solid phase to the liquid phase increased, but most of them remain in the former. Therefore, further purification and treatment measures are worthy of attention. © 2021 Elsevier Ltd

语种： 英文

作者： Luo, Longzao;Luo, Shuang;Wang, Huimin;Hu, Kexin;Lin, Xiaoai;...

期刊： Bioresource Technology,2021年337:125414 ISSN：0960-8524

通讯作者： Yan, Binghua(binghuayan@yeah.net)

作者机构： [Hu, Kexin; Wang, Huimin; Luo, Longzao; Liu, Linhai] Shangrao Normal Univ, Sch Chem & Environm Sci, Shangrao 334001, Peoples R China.;[Yan, Binghua; Luo, Shuang] Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Peoples R China.;[Lin, Xiaoai] Shangrao Normal Univ, Coll Life Sci, Shangrao 334001, Peoples R China.

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

关键词： Humic acid;Light intensity;Microalgae;Temperature;TiO2

摘要： Resource recovery from piggery biogas slurry has become an inevitable demand for sustainable development of pig industry. Microalgae show great potential in recovering nitrogen and phosphorus from piggery slurry, but struggle to utilize organic pollutants, as most of them are inert components (e.g., humic acids, HAs). In this study, nano-TiO2 was used to enhance the utilization of HAs by microalgae from piggery biogas slurry. Results showed that the optimal conditions for microalgal growth and HAs removal by the microalgae-TiO2 coupling system were TiO2 dosage of 0.30 g/L, microalgal inoculation concentration of 0.40 g/L, light intensity of 360 µmol photon/(m2·s) and temperature of 30 °C, with the microalgal chlorophyll concentration of 6.51 mg/L and HAs removal efficiency of 50.14%. Analysis of HAs composition variations in the piggery biogas slurry indicated that the decrease of HAs was caused by their decomposition into small molecules under the photocatalytic reactions of TiO2. © 2021 Elsevier Ltd

语种： 英文

作者： Li, Bingyu;Wei, Dongning;Zhou, Yimin;Huang, Yayuan;Tie, Boqing;...

期刊： Chemical Engineering Journal,2021年424:130410 ISSN：1385-8947

通讯作者： Lei, Ming

作者机构： [Huang, Yayuan; Tie, Boqing; Li, Bingyu; Wei, Dongning; Lei, Ming; Zhou, Yimin] Hunan Agr Univ, Coll Resource & Environm, Changsha 410128, Peoples R China.;[Huang, Yayuan; Tie, Boqing; Li, Bingyu; Wei, Dongning; Lei, Ming; Zhou, Yimin] Hunan Engn & Technol Res Ctr Irrigat Water Purifi, Changsha 410128, Peoples R China.;[Huang, Yayuan; Tie, Boqing; Li, Bingyu; Wei, Dongning; Lei, Ming; Zhou, Yimin] Minist Agr, Key Lab Southern Farmland Pollut Prevent & Contro, Changsha 410128, Peoples R China.;[Huang, Yayuan; Tie, Boqing; Li, Bingyu; Wei, Dongning; Lei, Ming; Zhou, Yimin] Prov Key Lab Rural Ecosyst Hlth Dongting Lake Are, Changsha 410128, Hunan, Peoples R China.

通讯机构： [Lei, Ming] H;[Lei, Ming] M;[Lei, Ming] P;Hunan Agr Univ, Coll Resource & Environm, Changsha 410128, Peoples R China.;Hunan Engn & Technol Res Ctr Irrigat Water Purifi, Changsha 410128, Peoples R China.

关键词： ATR-FTIR;Arsenate;Cadmium;Adsorption;Ternary complex

摘要： Elucidating the interfacial interactions of arsenate (AsO43-) and cadmium (Cd) on minerals can better reveal their environmental behavior under various geological settings. Herein, the adsorption of Cd on ferrihydrite (Fh) in the presence of arsenate was investigated through batch experiments, surface complexation, and spectroscopic techniques. We determined the concentration-dependent interactions of Cd (II) and As (V) on each other's behavior on Fh. Cadmium and arsenate tended to co-precipitate at high Cd/As ratios, whereas adsorption dominated at low Cd/As ratios. Compared with the single-ion system, the coexistence of Cd(II) and As on Fh significantly reduces the respective mobility of Cd(II) and As(V). The results of in situ attenuated total reflection–Fourier-transform infrared spectroscopy and charge distribution multisite complexation modeling revealed that the synergistic effects originated from electrostatic interactions and the formation of a ternary complex. The curve fitting of the spectra revealed three deconvolution peaks at ~ 765 cm−1, ~813 cm−1, and ~ 870 cm−1, which were assigned to As–OX (X = H+, cations, and H2O), As–O–Fe, and As–Oumcomplexed, respectively. After the addition of Cd(II), the intensity of As–OX increased at different pH values, indicating the formation of an As–O–Cd ternary complexes. We infer that two types of surface complex were assembled on the surface of Fh: namely anion-bridged Fe–As–Cd and cation-bridged Fe–Cd–As. These results contribute to our understanding of the behavior of multiple contaminates in an iron-rich environment and are helpful for the development of the corresponding restoration technology. © 2021 Elsevier B.V.

语种： 英文

作者： 蔡彤;杜辉辉;刘孝利;铁柏清;杨宇

期刊： 环境科学,2021年42(5):2522-2530 ISSN：0250-3301

通讯作者： Liu, Xiao-Li(zzhxxll@163.com)

作者机构： [蔡彤; 杜辉辉; 刘孝利; 铁柏清; 杨宇] College of Resources and Environment, Hunan Agricultural University, Changsha;410128, China;Technology and Research Center for Irrigation Water Resource and Quality Purification of Hunan Province, Changsha;[蔡彤; 杜辉辉; 刘孝利; 铁柏清] 410128, China<&wdkj&>Technology and Research Center for Irrigation Water Resource and Quality Purification of Hunan Province, Changsha;[蔡彤; 杜辉辉; 刘孝利; 铁柏清; 杨宇] 410128, China

关键词： 油茶果壳;硅酸钠改性;添加量;Cd形态;淹水实验

摘要： 研究选取湖南典型农业废弃物油茶果壳为原材料,尝试采用Na2SiO3溶液浸泡油茶果壳粉末方法,制备改性生物炭（MBC）,并开展不同生物炭材料对溶液中镉（Cd）的吸附与其耦合淹水对土壤中Cd的活性阻控性能研究.用扫描电镜（SEM）、比表面积测试（BET）和傅里叶红外光谱（FTIR）等表征手段对生物炭的物理化学性质进行分析.结果显示,MBC相比未改性生物炭（BC）拥有更大的比表面积与更加丰富的官能团种类,且对溶液中Cd2+具有更强的吸附能力.土壤淹水实验结果表明,淹水可使土壤p H值升高,同时降低酸可溶态Cd组分含量,且随着淹水时间的延长,土壤酸可溶态Cd含量呈逐渐向残渣态转化趋势,而生物炭添加耦合淹水比淹水对照处理能明显进一步促进可溶态Cd向残渣态转化,降低酸可溶态Cd含量.酸可溶态Cd组分含量与生物炭的添加量呈显著负相关关系,淹水60 d时,5.0%添加量的MBC实验组土壤酸可溶态Cd含量约为0.33 mg·kg-1,相比仅淹水的对照处理降幅约为45.0%.综上可知,硅酸钠溶液改性油茶果壳生物炭是一种Cd污染水土和土壤治理的新型有效材料,研究结果同时为油茶果壳的资源化途径提供了方法参考.

语种： 中文

作者： Riaz, Muhammad;Kamran, Muhammad;Fang, Yizeng;Yang, Guoling;Rizwan, Muhammad;...

期刊： Chemosphere,2021年266:128938 ISSN：0045-6535

通讯作者： Wang, Xiurong

作者机构： [Riaz, Muhammad; Wang, Qianqian; Fang, Yizeng; Deng, Lulu; Yang, Guoling; Wang, Youjuan; Wang, Xiurong] South China Agr Univ, Coll Nat Resources & Environm, Root Biol Ctr, State Key Lab Conservat & Utilizat Subtrop Agrobi, Guangzhou 510642, Guangdong, Peoples R China.;[Kamran, Muhammad] Chinese Acad Sci, Inst Soil Sci, Key Lab Soil Environm & Pollut Remediat, Nanjing 210008, Peoples R China.;[Rizwan, Muhammad; Ali, Shafaqat] Govt Coll Univ Faisalabad, Dept Environm Sci & Engn, Faisalabad 38000, Pakistan.;[Ali, Shafaqat] China Med Univ, Dept Biol Sci & Technol, Taichung 40402, Taiwan.;[Zhou, Yaoyu] Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Peoples R China.

通讯机构： [Wang, Xiurong] S;South China Agr Univ, Coll Nat Resources & Environm, Guangzhou 510642, Guangdong, Peoples R China.

关键词： Cadmium;Micronutrient;Polysaccharides;Alleviation;Defense;Heavy metals

摘要： Cadmium (Cd) pollution is a key concern globally that affects plant growth and productivity. Boron (B) is a micronutrient that helps in the formation of the primary cell wall (CW) and alleviates negative effects of toxic elements on plant growth. Nonetheless, knowledge about how B can reduce Cd toxicity in rice seedlings is not enough, particularly regarding CW-Cd adsorption. Therefore, the current experiment investigated the alleviative role of B on Cd toxicity in rice seedling. The experiment was carried out with 0 μM and 30 μM H3BO3 under 50 μM Cd toxicity in hydroponics. The results showed that Cd exposure alone inhibited plant growth parameters and caused lipid peroxidation. Moreover, Cd toxicity led to obvious visible toxicity symptoms on the leaves. However, increasing the availability of B alleviated Cd toxicity by reducing Cd concentration in plant tissues and improving antioxidative system. Moreover, cell wall pectin and hemicellulose adsorbed a significant amount of Cd. Fourier-Transform Infrared spectroscopy (FTIR) spectra exhibited that cell wall functional groups were increased by B application. Scanning electron microscopy (SEM) equipped with energy-dispersive X-ray (EDX) microanalysis confirmed the higher Cd binding onto CW. The findings of this investigation showed that B could mitigate Cd stress by decreasing Cd uptake and encouraging Cd adsorption on CW, and activation of the protective mechanisms. The present results might help to increase rice productivity on Cd polluted soils. © 2020 Elsevier Ltd

语种： 英文

作者： Chen, Hong;Wu, Jun;Wang, Hong;Zhou, Yaoyu;Xiao, Benyi*;...

期刊： Environmental Technology,2021年42(28):4539-4549 ISSN：0959-3330

通讯作者： Xiao, Benyi

作者机构： [Zhou, Lu; Wu, Jun; Chen, Hong; Wang, Hong; Xiong, Ying; Yu, Guanlong] Changsha Univ Sci & Technol, Sch Hydraul Engn, Key Lab Dongting Lake Aquat Ecoenvironm Control &, Changsha, Peoples R China.;[Wu, Jun; Xiao, Benyi] Chinese Acad Sci, Res Ctr Ecoenvironm Sci, 18 Shuangqing Rd, Beijing 100085, Peoples R China.;[Zhou, Yaoyu] Hunan Agr Univ, Coll Resources & Environm, Changsha, Peoples R China.;[Zhou, Yaoyu] Hong Kong Polytech Univ, Dept Civil & Environm Engn, Kowloon, Hong Kong, Peoples R China.;[Yang, Min; Wu, Sha] Changsha Univ Sci & Technol, Sch Chem & Food Engn, Changsha, Peoples R China.

通讯机构： [Xiao, Benyi] C;Chinese Acad Sci, Res Ctr Ecoenvironm Sci, 18 Shuangqing Rd, Beijing 100085, Peoples R China.

关键词： Butyric-type fermentation;inoculum pretreatment;renewable fuel;resource utilisation;organic waste

摘要： Biohydrogen produced from agricultural waste through dark co-fermentation is an increasingly valuable source of renewable energy. Rice straw (RS) and pig manure (PM) are widely available waste products in Asia with complementary levels of carbon and nitrogen that together have a high biohydrogen production potential. However, no research has yet determined the ideal inoculum pretreatment method and mixing ratio for biohydrogen production using these resources. In this study, we tested biohydrogen production using three different inoculum pretreatment methods (acid, alkali and thermal) at five RS/PM ratios (1:0, 5:1, 3:1, 1:1 and 0:1, based on total solids). All three pretreatments promoted biohydrogen production with the increase of bioactivity of biohydrogen-producing organisms (compared with a control group), though acid was clearly superior to thermal or alkali. Using acid pretreatment and RS/PM ratio of 5:1 corresponded with a relatively low (Formula presented.) -N concentration (655.17 mg/L), a maximal cumulative biohydrogen production of 44.59 mL/g VSadded with a low methane production (&lt;0.1%), a large butyric acid accumulation (1035.30 mg/L) and a biohydrogen conversion rate of 2.12%. The optimal pH for biohydrogen production from co-fermentation of RS and PM ranged from 5.0–5.5. © 2020 Informa UK Limited, trading as Taylor & Francis Group.

语种： 英文

作者： Deng, Xiao;Chen, Yixuan;Yang, Yang;Peng, Liang;Si, Luo;...

期刊： 环境科学与工程前沿(英文),2021年15(6):1-13 ISSN：2095-2201

通讯作者： Zeng, Qingru(qrzeng@163.com)

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

通讯机构： [Qingru Zeng] C;College of Resources and Environment, Hunan Agricultural University, Changsha, China

关键词： Cadmium;Genotypes;Growth stages;Micro X-ray fluorescence;Planting mode

摘要： Global rice production practices have gradually changed from a reliance on transplanting to direct seeding. Yet how this shift may alter cadmium (Cd) accumulation in rice is poorly known. Here we conducted field experiments with two rice genotypes cultivars that were planted using three methods: via direct seeding (DS), seedling throwing (ST), and manual transplanting (MT). Rice samples were collected during four growth stages. The formation and distribution of iron plaque were analyzed using DCB (dithionite-citrate-bicarbonate) extractions and observed under micro-XRF (micro X-ray fluorescence). The results revealed that, in each growth stage, DS rice was more apt to harbor Cd distributed in the plant’s aerial parts, and the Cd concentration of brown rice from DS was 21.8%–43.3% significantly higher than those from ST and MT at maturity stage (p < 0.05). During the vegetative stages, the Cd uptake percentage was higher in DS than MT rice, and those plants arising from the DS method were capable of absorbing more Cd earlier in their growth and development. Conversely, using DS decreased the amount of iron plaque covering the root surface in every growth stage, especially in the critical period of Cd accumulation, such that the roots’ middle areas were distinguished by a near-complete absence of iron plaque, thus weakening its role as an effective barrier to Cd uptake from soil. Collectively, this study demonstrated that implementing the DS mode of planting will increase Cd’s distribution in the aboveground parts of rice, and heightening the risk of Cd contamination in grain.

语种： 英文

作者： Feng, Chengyang;Tang, Lin*;Deng, Yaocheng;Wang, Jiajia;Liu, Yani;...

期刊： Applied Catalysis B: Environmental,2021年281:119539 ISSN：0926-3373

通讯作者： Tang, Lin

作者机构： [Wang, Jiajia; Yu, Jiangfang; Tang, Lin; Wang, Jingjing; Liu, Yani; Feng, Chengyang; Yang, Haoran; Ouyang, Xilian] Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Hunan, Peoples R China.;[Wang, Jiajia; Yu, Jiangfang; Tang, Lin; Wang, Jingjing; Liu, Yani; Feng, Chengyang; Yang, Haoran; Ouyang, Xilian] Hunan Univ, Key Lab Environm Biol & Pollut Control, Minist Educ, Changsha 410082, Hunan, Peoples R China.;[Deng, Yaocheng] Hunan Agr Univ, Coll Resources & Environm, Changsha 410028, Peoples R China.

通讯机构： [Tang, Lin] H;Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Hunan, Peoples R China.

关键词： Band structure regulation;Charge separation;g-C3N4;sulfur doping;Surface charge transfer

摘要： Exfoliating g-C3N4 into 2D nanosheet to minimize the stacking layer for the improvement of charge transfer and separation is considered to be the effective measure to enhance its photocatalytic performance. However, no matter what method is used, the exfoliated g-C3N4 nanosheet shows decreased optical absorption compared to the pristine bulk-like one. In this work, a simple one-step sulfur doping method is proposed on the basis of exfoliated g-C3N4 nanosheet, which can directly regulate the band structure of g-C3N4 and enhance its optical absorption ability. The proposed sulfur doping method redshift the light absorption edge of g-C3N4 nanosheet to the level of pristine bulk-like g-C3N4, and even induce the generation of a new n→π* absorption band. In addition, the introduced sulfur doping site can form a local electron accumulation point, so that to further improve the charge separation efficiency and surface charge transfer ability of g-C3N4 nanosheets. © 2020 Elsevier B.V.

语种： 英文

作者： Wu, Xiuwen;Tian, Hui;Li, Li;Guan, Chunyun;Zhang, Zhenhua

期刊： Environmental Pollution,2021年285:117218 ISSN：0269-7491

通讯作者： Zhang, Zhenhua(zhzh1468@163.com)

作者机构： [Tian, Hui; Wu, Xiuwen] Qingdao Agr Univ, Coll Resources & Environm Sci, Qingdao, Peoples R China.;[Li, Li; Zhang, Zhenhua; Tian, Hui] Hunan Agr Univ, Coll Resources & Environm Sci, Southern Reg Collaborat Innovat Ctr Grain & Oil C, Changsha, Peoples R China.;[Guan, Chunyun] Natl Ctr Oilseed Crops Improvement, Hunan Branch, Changsha, Peoples R China.

通讯机构： [Zhenhua Zhang] S;Southern Regional Collaborative Innovation Center for Grain and Oil Crops in China, College of Resources and Environmental Sciences, Hunan Agricultural University, Changsha, China

关键词： Cadmium tolerance;Cell wall components;Oilseed rape;Subcellular distribution;Vacuolar

摘要： Oilseed rape (Brassica napus) has potential as a hyperaccumulator in the phytoremediation of cadmium (Cd)-contaminated soils. Oilseed rape varieties with higher Cd accumulation ability and Cd tolerance are ideal candidates for the hyperaccumulation of excess Cd. To explore the physiological and molecular mechanisms underlying Cd tolerance and high Cd accumulation in oilseed rape leaves, we examined two genotypes, "BN067" (Cd-sensitive with lower Cd accumulation in leaves) and "BN06" (Cd-tolerant with higher Cd accumulation in leaves). We characterized the physiological morphology, structure, subcellular distribution of Cd, cell wall components, cell chelates, and the transcriptional levels of the related genes. Greater Cd accumulation was observed in the cell walls and vacuoles of Cd-tolerant leaves, reducing Cd toxicity to the lamellar structure of the chloroplast thylakoid and leaf stomata. Higher expression of PMEs genes and lower expression of pectin methylesterase inhibitors (PMEI) genes improved pectin methyl esterase (PME) activity in leaves of Cd-tolerant genotype. Stronger demethylation of pectin along with higher pectin and hemicellulose levels induced by lower pectinase and hemicellulose activities in the leaves of the Cd-tolerant genotype, resulting in higher Cd retention in the cell walls. Under Cd toxicity, higher Cd sequestration within the vacuoles of Cd-tolerant leaves was closely related to greater accumulation of Cd chelates with stronger biosynthesis in protoplasts. The results highlight the importance of using hyperaccumulation by plants to remediate our environment, and also provide a theoretical basis for the development of Cd-tolerant varieties. 0 2021 Published by Elsevier Ltd.

语种： 英文

作者： Xiong, Sheng;Gong, Daoxin;Deng, Yaocheng;Tang, Rongdi;Li, Ling;...

期刊： Bioresource Technology,2021年337:125407 ISSN：0960-8524

通讯作者： Deng, Yaocheng(dengyaocheng@hunau.edu.cn)

作者机构： [Deng, Yaocheng; Tang, Rongdi; Li, Ling; Gong, Daoxin; Su, Long; Zhou, Zhanpeng; Yang, Lihua; Xiong, Sheng; Zheng, Jiangfu] Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Peoples R China.

通讯机构： [Yaocheng Deng] C;College of Resources & Environment, Hunan Agricultural University, Changsha 410128, China

关键词： Adsorption;Biochar;Butachlor;Enteromorpha prolifera;Pore tailoring

摘要： In this work, Enteromorpha prolifera derived magnetic biochar (MBC) is prepared for the removal of butachlor (BTR) and characterized. The NaOH added during the magnetic loading process has an activating effect and enhancing the accessibility of the pores. Based on the BET result, the importance of pore accessibility rather than the specific surface area has been proposed. The maximum adsorption capacity of BTR for MBC is 158.5 mg/g. Then, the batch experiment shows that the adsorption of MBC to BTR fitted with the quasi-second-order kinetic model. The effect factors on the BTR removal were studied. Through the result of BET, Raman, XPS and FT-IR, the mechanism of MBC adsorption of butachlor was explored. After 3 cycles, the prepared MBC has a negligible reduction in the removal capacity of BTR, which provides a reference scheme for the large-scale application of Enteromorpha prolifera and the water treatment of BTR. © 2021 Elsevier Ltd

语种： 英文

作者： Liu, Huanyao;Meng, Cen;Wang, Yi;Li, Yong;Li, Yuyuan;...

期刊： Ecological Indicators,2021年127:107781 ISSN：1470-160X

通讯作者： Wang, Yi(wangyi@isa.ac.cn)

作者机构： [Liu, Huanyao] Hunan Agr Univ, Coll Resource & Environm, Changsha 410128, Peoples R China.;[Wang, Yi; Li, Yuyuan; Wu, Jinshui; Li, Yong; Meng, Cen; Liu, Xinliang] Chinese Acad Sci, Inst Subtrop Agr, Changsha Res Stn Agr & Environm Monitoring, Changsha 410125, Peoples R China.;[Wang, Yi; Li, Yuyuan; Wu, Jinshui; Li, Yong; Meng, Cen; Liu, Xinliang] Chinese Acad Sci, Inst Subtrop Agr, Key Lab Agroecol Proc Subtrop Reg, Changsha 410125, Peoples R China.

通讯机构： [Yi Wang] C;Changsha Research Station for Agricultural & Environmental Monitoring, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China<&wdkj&>Key Laboratory for Agro-ecological Processes in Subtropical Regions, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China

关键词： Catchment environment;Landscape;Water quality;Topography;Soil type;Land use

摘要： Although a landscape is a multidimensional integrated synthesis, the relationship between land use and water quality was merely studied in relation to protecting the aquatic ecological service function from the ‘landscape perspective’. This study analyzed the integrated landscape pattern by coupling land use, soil property, and topography and determined the stream water total nitrogen (TN) and total phosphorus (TP) in Chinese subtropical catchments from 2010 to 2017 to reveal and quantify the relationship between multidimensional landscape patterns and stream water N and P levels using the GIS and partial least squares regression (PLSR) techniques. The results suggested that the areal proportions of tea field and residential area in the Ultisols and on the first three slope categories (0–28.02°) and paddy field in the Ultisols and on slope category I (0–5.35°) were positively correlated with the TN and TP, while forest in the Ultisols and on slope category IV (28.02–80.30°) was negatively correlated with the TN (p ≤ 0.05). For the multidimensional landscape metrics, the Euclidean nearest-neighbor distance (ENN_MN) and interspersion and juxtaposition index (IJI) were positively correlated with the TN, while the ENN_MN was positively correlated with the TP (p ≤ 0.05). The PLSR analysis explained the variations of TN and TP levels well (R2 ≥ 0.66), in which the areal proportions of the tea field and residential area in the Ultisols and on the first three slope categories (0–28.02°) and the paddy field in the Ultisols and on slope category I (0–5.35°) were the important variables for both TN and TP; however, the areal proportions of forest in the Ultisols and on slope category IV (28.02–80.30°) and the IJL were only important to the TN. Therefore, the multidimensional landscape pattern providing specific land use, soil property, and topography can be more capable in restoring and protecting stream N and P pollution at an applicable level. © 2021 The Authors

语种： 英文

作者： Zhang, Pingzhi;Hou, Zhufeng;Jiang, Li*;Yang, Jack;Saidi, Wissam A.;...

期刊： ACS Applied Materials & Interfaces,2021年13(51):61365-61373 ISSN：1944-8244

通讯作者： Li, Wei;Jiang, Li

作者机构： [Zhang, Pingzhi; Li, Wei] Hunan Agr Univ, Sch Chem & Mat Sci, Changsha 410128, Peoples R China.;[Hou, Zhufeng] Chinese Acad Sci, Fujian Inst Res Struct Matter, State Key Lab Struct Chem, Fuzhou 350002, Peoples R China.;[Yang, Jack] Univ New South Wales, Sch Mat Sci & Engn, Mat & Mfg Futures Inst, Sydney, NSW 2052, Australia.;[Saidi, Wissam A.] Univ Pittsburgh, Dept Mech Engn & Mat Sci, Pittsburgh, PA 15261 USA.;[Prezhdo, Oleg, V] Univ Southern Calif, Dept Chem, Los Angeles, CA 90089 USA.

通讯机构： [Li, Wei; Jiang, Li] H;Hunan Agr Univ, Sch Chem & Mat Sci, Changsha 410128, Peoples R China.;Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Peoples R China.

关键词： Cu2ZnSnS4;anharmonicity;charge carrier lifetime;nonadiabatic dynamics;real-time time-dependent density functional theory

摘要： We report a time-domain ab initio investigation of the nonradiative electron-hole recombination in quaternary Cu2ZnSnS4 (CZTS) at different temperatures using a combination of time-dependent density functional theory and nonadiabatic molecular dynamics. Our results demonstrate that higher temperatures increase both inelastic and elastic electron-phonon interactions. Elevated temperatures moderately increase the lattice anharmonicity and cause stronger fluctuations of electronic energy levels, enhancing the electron-phonon coupling. The overall nuclear anharmonic effect is weak in CZTS, which can be ascribed to their stable bonding environment. Phonon-induced loss of electronic coherence accelerates with temperature, due to stronger elastic electron-phonon scattering. The enhanced inelastic electron-phonon scattering decreases charge carrier lifetimes at higher temperatures, deteriorating material performance in optoelectronic devices. The detailed atomistic investigation of the temperature-dependent charge carrier dynamics, with particular focus on anharmonic effects, guides the development of more efficient solar cells based on CZTS and related semiconductor photoabsorbers. © 2021 American Chemical Society.

语种： 英文

作者： Zhang, Wenping;Li, Hanchang;Tan, Xin;Li, Zhonghao;Zhong, Cheng;...

期刊： ENVIRONMENTAL ENGINEERING SCIENCE,2021年38(7):676-684 ISSN：1092-8758

通讯作者： Wu, Genyi(wugenyi99@163.com)

作者机构： [Li, Hanchang; Xiao, Weihua; Zhang, Wenping; Tan, Xin; Zhong, Cheng; Li, Zhonghao; Zhang, Wenjun; Yang, Liangjiu] Hunan Agr Univ, Coll Water Resources & Civil Engn, Changsha, Peoples R China.;[Xiong, Yuanfu; Zhang, Wenping; Wu, Genyi] Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Peoples R China.;[Wu, Genyi] Environm Sci Inst South China, Environm Protect Dept, Guangzhou, Peoples R China.

通讯机构： [Genyi Wu] C;College of Resources and Environment, Hunan Agricultural University, Changsha, P.R. China.<&wdkj&>Environmental Protection Department, Environmental Science Institute in South China, Guangzhou, P.R. China.

关键词： Cd concentration;DCB-Cd;Fe–Mn plaque;oxygation

摘要： Oxygation (O) is a water-saving and energy-saving irrigation method that can also influence the absorption of cadmium (Cd) by rice, but the related mechanism is still unclear. In this study, the relationship between O method and Fe-Mn plaque formation was tested through pot experiments. The Fe-Mn plaque content and Cd concentration were measured during different rice growth periods, and the fitted models based on their correlation were established. The results show that, Fe-Mn plaque formation was the most significant factor affecting Cd accumulation in rice under O conditions. The content of rice root Fe-Mn plaque was higher after the application of O during the filling and maturity stages of rice growth, and Fe-Mn plaque inhibited Cd accumulation in the rice roots and grains and reduced the translocation factors (TFs) from the rice dithionite-citrate-bicarbonate extract (DCB) to the roots (TFDCB-R) and from the roots to the straw (TFStraw-G). O may influence the Fe-Mn plaque formation on the root surface to impede Cd absorption by rice. This research provides theoretical support for the Cd absorption under O conditions. © Copyright 2021, Mary Ann Liebert, Inc., publishers 2021.

语种： 英文

作者： 周一敏;黄雅媛;刘晓月;李冰玉;刘羽翼;...

期刊： 环境科学,2021年42(2):932-940 ISSN：0250-3301

通讯作者： Lei, Ming(leiming8297@163.com)

作者机构： [周一敏; 黄雅媛; 李冰玉; 李卓晴; 王薪琪; 雷鸣] College of Resources and Environment, Hunan Agricultural University, Changsha;410128, China;[刘晓月] Aerospace Kaitian Environmental Technology Co., Ltd., Changsha;410100, China;[刘羽翼] Hunan Breath Environment Technology Co., Ltd., Changsha

关键词： 水稻;镉;富集;叶面喷施;纳米MnO2

摘要： 镉（Cd）容易被水稻富集,从而造成稻米中Cd含量超标,严重威胁人类健康.锰（Mn）是植物必需元素,为了探究叶面喷施纳米MnO2对水稻富集Cd的影响机制,本研究在酸性Cd污染土壤上进行田间小区试验,在水稻抽穗早期叶面喷施0.1%、0.3%和0.5%的纳米MnO2溶液.结果表明与对照组相比,叶面喷施不同浓度的纳米MnO2可以有效降低水稻叶、壳和糙米中的Cd含量,增加所有部位的Mn含量,但对水稻的产量影响不大.叶面喷施纳米MnO2后,提高了叶片光合作用效果,抑制了叶片脂质过氧化,增加了氧化应激酶的含量,从而缓解Cd对水稻的胁迫.此外,叶面喷施纳米MnO2增加了水稻根表铁锰胶膜的含量,强化了铁锰胶膜对Cd的吸附/共沉淀作用,从而限制水稻根系吸收Cd.因此,在水稻抽穗早期叶面喷施纳米MnO2是一种增加糙米中Mn含量和减少Cd含量的有效措施.

语种： 中文

作者： Tang, Rongdi;Xiong, Sheng;Gong, Daoxin*;Deng, Yaocheng*;Wang, Yongchang;...

期刊： ACS Applied Materials & Interfaces,2020年12(51):56663-56680 ISSN：1944-8244

通讯作者： Gong, Daoxin;Deng, Yaocheng

作者机构： [Wang, Yongchang; Liao, Chanjuan; Tang, Rongdi; Deng, Yaocheng; Gong, Daoxin; Su, Long; Yang, Lihua; Xiong, Sheng; Gong, DX] Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Peoples R China.;[Ding, Chunxia] Hunan Agr Univ, Sch Chem & Mat Sci, Changsha 410128, Peoples R China.

通讯机构： [Gong, DX; Deng, YC] H;Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Peoples R China.

关键词： Ti3C2 MXene;Synthesis and modification;Photocatalysis;Hydrogen production;Pollutant removal

摘要： In 2011, with the successful isolation of Ti3C2, a door of 2D layered MXene has been opened and received growing attention from researchers. MXene refers to a family of two-dimensional (2D) materials made up of atomic layers of the transition metal, carbide, nitrides, or carbonitrides. Given the large surface area, adjustable surface terminal groups, and excellent conductivity of MXene, it has shown exciting potential in photocatalysis, energy conversion, and many other fields. Among many 2D MXene, Ti3C2 was the most studied for its availability, low cost, facile modification procedure, and outstanding electronic properties. In previous investigations, Ti3C2 has shown huge potential in the photocatalysis area. Ti3C2 in a photocatalysis system can enhance the separation of photoinduced electrons and holes, reduce charge recombination, and thus improve the photocatalysis performance in many systems. To adjust the performance of Ti3C2 in different applications, the properties of Ti3C2 including morphology, structures, and stability are tunable by different post-processing method in the hybridized materials. In this review, an all-around understanding of the fabrication and modification methods of Ti3C2 and their connection to photocatalytic applications of Ti3C2 MXene based materials are presented. Moreover, a summary and our perspectives of Ti3C2 are given for further investigation. ©

语种： 英文

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

期刊： Environmental Pollution,2020年262(Jul.):114289.1-114289.11 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： Wang, Di;Sun, Yuqing;Tsang, Daniel C. W.*;Hou, Deyi;Khan, Eakalak;...

期刊： Chemical Engineering Journal,2020年388:124243 ISSN：1385-8947

通讯作者： Wang, Linling;Tsang, Daniel C. W.

作者机构： [Gong, Jianyu; Wang, Linling; Wang, Di] Huazhong Univ Sci & Technol, Sch Environm Sci & Engn, Wuhan 430074, Peoples R China.;[Sun, Yuqing; Tsang, Daniel C. W.; Wang, Di; Zhao, Yaoyu] Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hung Hom, Kowloon, Hong Kong, Peoples R China.;[Hou, Deyi] Tsinghua Univ, Sch Environm, Beijing 100084, Peoples R China.;[Khan, Eakalak] Univ Nevada, Dept Civil & Environm Engn & Construct, Las Vegas, NV 89154 USA.;[Alessi, Daniel S.] Univ Alberta, Dept Earth & Atmospher Sci, Edmonton, AB T6G 2E3, Canada.

通讯机构： [Wang, Linling; Tsang, Daniel C. W.] H;Huazhong Univ Sci & Technol, Sch Environm Sci & Engn, Wuhan 430074, Peoples R China.;Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hung Hom, Kowloon, Hong Kong, Peoples R China.

关键词： Advanced oxidation process;Hydraulic fracturing;Polyacrylamide;Shale gas development;Suspended solid;Sustainable wastewater treatment

摘要： The high content and low removal efficiency of suspended solids (SS) in wastewater derived from shale gas development via hydraulic fracturing has raised advanced treatment problems (e.g., organics removal) and environmental concerns. In this study, two kinds of suspended solids were separated from synthetic flowback wastewater (FWW) after 1 or 14 days of sedimentation. The physicochemical properties, porous structures, surface chemistry, and particle stability of the obtained 1-/14-day solids were characterized. To illustrate the specific roles of SS during radical-based FWW treatment, the removal of di-(2-ethylhexyl) phthalate (DEHP, a typical recalcitrant organic that has been identified in FWW) by a ferrous iron/peroxysulphate (Fe2+/PS) system was examined as a representative case. Results showed that DEHP was simultaneously adsorbed onto the solids and degraded by Fe2+/PS. The removal processes were governed by the phase distribution of DEHP and Fe2+, and the distribution was influenced by interactions between the 1-/14-day solids, Fe2+/PS, and various FWW components. Polyacrylamide (PAM), an anionic surfactant commonly detected in FWW, can attach to the solids and aid in maintaining the structural and compositional integrity of the solids. Due to stronger adsorption with PAM, the 14-day solids retained less DEHP and Fe2+, contributing to enhanced DEHP degradation in the solution phase as compared to the 1-day solids. Thus, sufficient sedimentation is advantageous for the degradation of recalcitrant organic contaminants (e.g., DEHP) in FWW treatment. Moreover, certain FWW components (i.e., PAM and ethylene glycol) can interact with FWW solids, creating a positive synergistic effect on organic removal efficiency. © 2020 Elsevier B.V.

语种： 英文

作者： Cao, Jiao;Sun, Saiwu;Li, Xin;Yang, Zhaohui*;Xiong, Weiping;...

期刊： Chemical Engineering Journal,2020年382:122802 ISSN：1385-8947

通讯作者： Yang, Zhaohui

作者机构： [Yang, Zhaohui; Cao, Jiao; Jia, Meiying; Zhang, Yanru; Wu, You; Sun, Saiwu; Xiong, Weiping; Zhou, Chengyun; Li, Xin] Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Hunan, Peoples R China.;[Yang, Zhaohui; Cao, Jiao; Jia, Meiying; Zhang, Yanru; Wu, You; Sun, Saiwu; Xiong, Weiping; Zhou, Chengyun; Li, Xin] Hunan Univ, Minist Educ, Key Lab Environm Biol & Pollut Control, Changsha 410082, Peoples R China.;[Zhou, Yaoyu] Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Peoples R China.

通讯机构： [Yang, Zhaohui] H;Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Hunan, Peoples R China.

关键词： Actual wastewater;Aluminum-cobalt layered double hydroxide (AlCo-LDH);Cobalt zeolitic imidazolate framework (Co-ZIF);PMS activation;Tetracycline (TC)

摘要： In consideration of the complex synthesis of layered double hydroxides (LDHs), a simple and efficient strategy was needed to design and fabricate LDHs with high performance. In this study, aluminum-cobalt layered double hydroxide (AlCo-LDH) with uniformly distributed component was synthesized by in-situ etching of cobalt zeolitic imidazolate framework (Co-ZIF) at room temperature. The obtained AlCo-LDH showed high catalysis performance of tetracycline (TC) degradation via the activation of peroxymonosulfate (PMS). The removal efficiency can reach to 92.3% within 5 min and 49.1% of TOC removal efficiency could be obtained in 30 min. Moreover, the degradation rate constants of AlCo-LDH/PMS system (0.980 min−1) was about 16.6 times higher than Co-ZIF/PMS system (0.059 min−1). The unique hydrotalcite-like layered structure of AlCo-LDH with large surface area and volume made TC molecules diffused and interacted with the reaction sites more easily. More importantly, the higher content of Al ions in AlCo-LDH catalyst helped the low content of Co ions to activate PMS. The forming process of AlCo-LDH and the TC degradation mechanisms were investigated. The quenching experiments combined with electron paramagnetic resonance (EPR) analysis showed the SO4[rad]− and 1O2 radicals were the main reactive species for TC degradation. Moreover, the AlCo-LDH catalyst was stable in water for the negligible leaking of metal ions. Significantly, the AlCo-LDH/PMS system was effective and almost unaffected by pH values, organic and inorganic matters in water. In addition, high removal efficiencies were achieved in various real samples by the AlCo-LDH/PMS system. This work provided a novel and facile route to synthesis advanced MOF-derived LDHs catalyst with high performance in remediation of actual wastewater. © 2019 Elsevier B.V.

语种： 英文

作者： Zhou, J.;Chen, L. H.;Peng, L.;Luo, S.;Zeng, Q. R.*

期刊： Chemosphere,2020年247:125856 ISSN：0045-6535

通讯作者： Zeng, Q. R.

作者机构： [Chen, L. H.; Luo, S.; Peng, L.; Zhou, J.; Zeng, Q. R.] Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Hunan, Peoples R China.

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

关键词： Biochar;Contaminated biomass;Heavy metals;Oil crop rotation;Phytoremediation;Two-step extraction

摘要： The disposal of contaminated plants limits the use of phytoremediation. Therefore, the disposal of contaminated sunflower was investigated after determining the phytoremediation of heavy metals under an oil crop rotation of sunflower (Helianthus annuus L)–sesame (Sesamum indicum L.). In the field experiment, the extraction efficiency of sunflower-sesame rotation was 0.07% for lead (Pb); 1.37% for zinc (Zn); 1.10% for copper (Cu); and 6.12% for cadmium (Cd). Contaminated sunflower stems were pyrolyzed at different temperature. The biochar produced at 300 °C was extracted in a two-step process (acid-extraction from biochar and metals precipitation in alkaline condition). At pH = 1, 65.67% of the Cd and much potassium (K) were extracted. After acid-extraction, adjust the pH of filtrate to 10, metals were precipitated and then separated from the K-enriched solution. Therefore, pyrolysis can process contaminated residues, and the biochar extracts can be reutilized as fertilizer to off-site crop production. Thus, an oil crop-rotation system, in addition to creating economic benefits, can be used by local farmers in contaminated soils. © 2020 Elsevier Ltd

语种： 英文