标题: Passivation of multiple heavy metals in lead-zinc tailings facilitated by straw biochar-loaded N-doped carbon aerogel nanoparticles: Mechanisms and microbial community evolution

作者: Li, JH (Li, Jiahao); Xia, CG (Xia, Chenggong); Cheng, R (Cheng, Rong); Lan, JR (Lan, Jirong); Chen, FY (Chen, Fangyuan); Li, XL (Li, Xuli); Li, SY (Li, Shiyao); Chen, J (Chen, Jiaao); Zeng, TY (Zeng, Tianyu); Hou, HB (Hou, Haobo)

来源出版物: SCIENCE OF THE TOTAL ENVIRONMENT卷:803 DOI: 10.1016/j.scitotenv.2021.149866出版年: JAN 10 2022

摘要: Heavy metal (HM) soil pollution has become an increasingly serious problem with the development of industries. Application of biochar in HMs remediation from contaminated environment has attracted considerable research attention during the past decade. Although the mechanism of HMs passivation with biochar has been investigated, effects and mechanisms of interaction among soil-indigenous microbes and novel carbon matrix composites for HMs adsorption and passivation are still unclear. Four different biochar-loaded aerogels, namely, BNCA-1-600, BNCA-1-900, BNCA-2-600, and BNCA-2-900, were synthesized in this study. Adsorption capacity of four kinds of synthetic materials and two types of contrast biochars (BC600 and BC900) to HMs in aqueous solution, passivation capacity of HMs in soil, and effects on soil organic matter and microbial community were explored. Results showed that BNCA-2-900 exhibits excellent adsorption property and a maximum removal capacity of 205.07 mg.g(-1) at 25 degrees C for Pb(II), 105.56 mg.g(-1) for Cd(II), and 137.89 mg.g(-1) for Zn(II). Leaching concentration of HMs in contaminated soil can meet the national standard of China (GB/T 5085.3-2007) within 120 days. Results of this study confirmed that the additive BNCA-2-900 and coexistence of indigenous microorganisms can effectively reduce bioavailability of HMs. Another potential mechanism may be to remove the passivation ofHMs by porous structure and surface functional groups as well as improve the content of organic matter and microbial abundance. The research results may provide a novel perceptive for the development of functional materials and strategies for eco-friendly and sustainable multiple HMs remediation in contaminated soil and water by using a combination of carbon matrix composites and soil-indigenous microorganisms. (C) 2021 Published by Elsevier B.V.作者关键词: Heavy metals; Passivation; Nanoparticles; Biochar; Microbial diversity

地址: [Li, Jiahao; Cheng, Rong; Lan, Jirong; Chen, Fangyuan; Li, Xuli; Li, Shiyao; Chen, Jiaao; Zeng, Tianyu; Hou, Haobo] Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430072, Hubei, Peoples R China.

[Xia, Chenggong] Cent Southern Safety & Environm Technol Inst Co L, Wuhan 430071, Hubei, Peoples R China.

[Li, Jiahao; Zeng, Tianyu; Hou, Haobo] Wuhan Univ, Zhaoqing Environm Technol Res Inst, Zhaoqing 526200, Guangdong, Peoples R China.

通讯作者地址: Zeng, TY; Hou, HB (通讯作者)，Wuhan Univ, Zhaoqing Environm Technol Res Inst, Zhaoqing 526200, Guangdong, Peoples R China.

电子邮件地址: zty_0209@whu.edu.cn; houhb@whu.edu.cn

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