文献类型: 外文期刊
作者: Qiu, Weiwen;Liu, Xuewei;Lin, Lina;Khan, Zulgarnain Haider;Song, Zhengguo
作者机构:
关键词: Fe-Mn-La-impregnated biochar composite (FMLBC); Arsenic (As); Adsorption; Mechanism
期刊名称: SCIENCE OF THE TOTAL ENVIRONMENT
ISSN: 0048-9697
年卷期: 2019 年 686 卷
页码:
摘要: A novel Fe-Mn-La-impregnated biochar composite (FMLBC) was synthesized using an impregnation method for efficient As (III) adsorption. The pseudo-second-order model (R-2 values are 0.996, 0.996, and 0.994 for different FMLBC rate used) better fitted the kinetic adsorption of arsenic (As) on the FMLBC than the pseudo-first order model (R-2 values are 0.978, 0.971, and 0.991 respectively). The SEM-EDS, FTIR and XPS results confirmed the addition of Fe, Mn and La into the BC structure. Compared with pristine biochar (3.73 mg g(-1)) and Fe-Mnimpregnated biochar (9.48 mg g(-1)), the As (III) adsorption capacity of Fe-Mn-La impregnated biochar (14.9 mg g(-1)) was significantly improved. The presence of NO3- and SO42- did not influence As adsorption, whereas PO43- influenced As removal. The mechanism of As adsorption on the FMLBC involved oxidization, electrostatic attraction, ligand exchange, and formation of an inner-sphere R-O-As complex. Among them, the electrostatic attraction and inner-sphere complexation contributed the most. The simple preparation process and high adsorption performance suggest that the FMLBC could be served as a promising adsorbent for As (III) removal from aqueous solution. (C) 2019 Elsevier B.V. All rights reserved.
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