Sorption mechanisms of antibiotic sulfamethazine (SMT) on magnetite-coated biochar: pH-dependence and redox transformation

被引:28
作者
Bai, Shanshan [1 ]
Zhu, Shishu [2 ]
Jin, Chao [2 ]
Sun, Zhiqiang [1 ]
Wang, Li [1 ]
Wen, Qinxue [1 ]
Ma, Fang [1 ]
机构
[1] Harbin Inst Technol, Sch Environm, State Key Lab Urban Water Resource & Environm, Harbin 150090, Peoples R China
[2] Sun Yat Sen Univ, Sch Environm Sci & Engn, Guangzhou 510275, Peoples R China
关键词
Biochar; Sorption; Sulfonamide antibiotics; Hydrogen bond; Ionized organics;
D O I
10.1016/j.chemosphere.2020.128805
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Sorption of sulfonamides (SAs) on magnetite-coated biochar (MBC) is a promising approach for the remediation of antibiotic contaminants, due to its extended adsorption capacity and irreversibility. However, the actual sorption mechanisms of SAs on MBC remain unclear and the gap in knowledge hinders understanding of the fate of SAs in soils or sediments. In this study, various MBCs were prepared under different pyrolysis temperatures, with batch sorption experiments conducted using SMT as the model pollutant. Results of a two-compartment kinetic model demonstrated that aromatic components of MBCs dominated slow-sorption mechanisms, whereas the embedded magnetite further accelerated fast-sorption due to H-bonding. Modification of BC with magnetite improved the distribution coefficient (K-d) and isotherm linearity of SMT. Multi-parameter model results indicated that the pH-dependence of SMT sorption on BCs and MBCs occurred via a dominant mechanism of pi-bond assisted H-bonding. Compared to pristine BCs, the change in pH-dependent sorption characteristics of SMT on MBC results from the regulation of pi-bonding and proton configuration. Simultaneous transformation of SMT to sulfate ions on BCs or MBCs was also observed. The degradation of SMT occurred because of persistent free radicals (PFRs) on BCs or the inherent redox of iron minerals on MBCs. However, the small fraction of SMT transformed on BCs or MBCs was not found to result in overestimation of SMT sorption. This study presents the critical mechanisms of SMT sorption on pyrochars and provides novel understanding of the fate of SMT on carbonaceous materials during practical remediation applications. (C) 2020 Elsevier Ltd. All rights reserved.
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页数:10
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共 68 条
[1]   Biochar composites with nano zerovalent iron and eggshell powder for nitrate removal from aqueous solution with coexisting chloride ions [J].
Ahmad, Munir ;
Ahmad, Mahtab ;
Usman, Adel R. A. ;
Al-Faraj, Abdullah S. ;
Abduljabbar, Adel S. ;
Al-Wabel, Mohammad I. .
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH, 2018, 25 (26) :25757-25771
[2]   Self-assembly biochar colloids mycelial pellet for heavy metal removal from aqueous solution [J].
Bai, Shanshan ;
Wang, Li ;
Ma, Fang ;
Zhu, Shishu ;
Xiao, Ting ;
Yu, Tianmiao ;
Wang, Yujiao .
CHEMOSPHERE, 2020, 242
[3]   Simultaneous Immobilization of Lead and Atrazine in Contaminated Soils Using Dairy-Manure Biochar [J].
Cao, Xinde ;
Ma, Lena ;
Liang, Yuan ;
Gao, Bin ;
Harris, Willie .
ENVIRONMENTAL SCIENCE & TECHNOLOGY, 2011, 45 (11) :4884-4889
[4]   Transitional adsorption and partition of nonpolar and polar aromatic contaminants by biochars of pine needles with different pyrolytic temperatures [J].
Chen, Baoliang ;
Zhou, Dandan ;
Zhu, Lizhong .
ENVIRONMENTAL SCIENCE & TECHNOLOGY, 2008, 42 (14) :5137-5143
[5]   A novel magnetic biochar efficiently sorbs organic pollutants and phosphate [J].
Chen, Baoliang ;
Chen, Zaiming ;
Lv, Shaofang .
BIORESOURCE TECHNOLOGY, 2011, 102 (02) :716-723
[6]   Removal of sulfamethoxazole and ciprofloxacin from aqueous solutions by graphene oxide [J].
Chen, Hao ;
Gao, Bin ;
Li, Hui .
JOURNAL OF HAZARDOUS MATERIALS, 2015, 282 :201-207
[7]   Fast and slow adsorption of carbamazepine on biochar as affected by carbon structure and mineral composition [J].
Chen, Jian ;
Zhang, Di ;
Zhang, Huang ;
Ghosh, Saikat ;
Pan, Bo .
SCIENCE OF THE TOTAL ENVIRONMENT, 2017, 579 :598-605
[8]   Magnetic biochar catalysts from anaerobic digested sludge: Production, application and environment impact [J].
Chen, Yi-di ;
Bai, Shunwen ;
Li, Ruixiang ;
Su, Guanyong ;
Duan, Xiaoguang ;
Wang, Shaobin ;
Ren, Nan-qi ;
Ho, Shih-Hsin .
ENVIRONMENT INTERNATIONAL, 2019, 126 :302-308
[9]   pH-dependent sorption of sulfonamide antibiotics onto biochars: Sorption mechanisms and modeling [J].
Chen, Zaiming ;
Xiao, Xin ;
Xing, Baoshan ;
Chen, Baoliang .
ENVIRONMENTAL POLLUTION, 2019, 248 :48-56
[10]   Quantification of Chemical States, Dissociation Constants and Contents of Oxygen-containing Groups on the Surface of Biochars Produced at Different Temperatures [J].
Chen, Zaiming ;
Xiao, Xin ;
Chen, Baoliang ;
Zhu, Lizhong .
ENVIRONMENTAL SCIENCE & TECHNOLOGY, 2015, 49 (01) :309-317