Removal of tetracycline by biochar-supported biogenetic sulfidated zero valent iron: Kinetics, pathways and mechanism
文献类型： 外文期刊
作者： Wang, Anqi 1 ; Hou, Jun 1 ; Feng, Yanfang 2 ; Wu, Jun 1 ; Miao, Lingzhan 1 ;
作者机构： 1.Hohai Univ, Coll Environm, Key Lab Integrated Regulat & Resources Dev Shallo, Minist Educ, Nanjing 210098, Peoples R China
2.Jiangsu Acad Agr Sci, Inst Agr Resources & Environm, Key Lab Agro Environm Downstream Yangtze Plain, Minist Agr & Rural Affairs, Nanjing 210014, Peoples R China
关键词： Biogenetic sulfidation; Zero-valent iron; Biochar; Tetracycline; Reactive oxygen species
期刊名称：WATER RESEARCH （ 影响因子：12.8； 五年影响因子：13.3 ）
ISSN： 0043-1354
年卷期： 2022 年 225 卷
页码：
收录情况： SCI
摘要： The application of zero-valent iron (ZVI) is limited due to passivation and agglomeration. Therefore, biochar loading (MB) and biogenetic sulfidation via sulfate-reducing bacteria (SRB) were used to improve the reactivity of ZVI (BS-ZVI@MB) towards tetracycline (TC) degradation. Biochar provided more attachment sites for ZVI and SRB, thus alleviating the agglomeration. Additionally, quinone groups on biochar enhanced the electrons transfer through the measurement of electron donating/accepting capacities, and biogenetic sulfidation could inhibit the surface passivation of ZVI. Fe(II/III) produced after the addition of BS-ZVI@MB could complex with the A ring in TC to form Fe(II/III)-TC, which brought the oxidation of TC by complexed Fe(III). Reactive oxygen species (ROS) (primarily circle OH) were generated during the oxidation of Fe(II), so as to promote the TC degradation. Extracellular polymeric substances (EPS) secreted from SRB had a slight quenching effect on ROS. Meanwhile, EPS formed a protective layer with Fe(II/III) on BS-ZVI@MB, reducing its reactivity with TC. Overall, this study showed an efficient modification technology of ZVI by biogenetic sulfidation and biochar loading for TC degradation.
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