In situ arsenic oxidation and sorption by a Fe-Mn binary oxide waste in soil
In situ arsenic oxidation and sorption by a Fe-Mn binary oxide waste in soil
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DOI：
10.1016/j.jhazmat.2017.08.066
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发表时间：
2018-01-15
影响因子：
13.6
通讯作者：
Johnson, Karen L.
中科院分区：
文献类型：
--
作者：
McCann, Clare M.;Peacock, Caroline L.;Johnson, Karen L.
研究了铁锰二元氧化物废料对历史污染土壤中砷（As）的吸附能力。最初的实验室吸附实验表明，亚砷酸盐[As（III）]被氧化成砷酸盐[As（V）]的锰氧化物组分，与并发的As（V）吸附的铁氧化物。二元氧化物废物对As（III）和As（V）的吸附容量分别为70 mg g（-1）和32 mg g（-1）。X-射线吸收近边结构和扩展X-射线吸收精细结构在As K-边证实了所有二元氧化物废物表面络合物都是通过单核双齿角共享吸附的As（V），2Fe在3.27 A。废物在真实的土壤中进行这种耦合氧化-吸附反应的能力被研究，其中将10重量%的废物添加到工业As污染的土壤中。电子探针微区分析表明，砷积累到二氧化物废物的铁氧化物组分，其中没有作为先天。添加二元氧化物废物也使As的生物可利用性显著降低7.80%（p < 0.01）。结果表明，铁锰二元氧化物废料可以提供一个潜在的原位修复策略的砷和铅污染土壤的固定。皇冠版权所有（C）2017由Elsevier B. V.发布。保留所有权利。
The ability of a Fe-Mn binary oxide waste to adsorb arsenic (As) in a historically contaminated soil was investigated. Initial laboratory sorption experiments indicated that arsenite [As(III)] was oxidized to arsenate [As(V)] by the Mn oxide component, with concurrent As(V) sorption to the Fe oxide. The binary oxide waste had As(III) and As(V) adsorption capacities of 70 mg g(-1) and 32 mg g(-1) respectively. X-ray Absorption Near-Edge Structure and Extended X-ray Absorption Fine Structure at the As K-edge confirmed that all binary oxide waste surface complexes were As(V) sorbed by mononuclear bidentate corner-sharing, with 2 Fe at 3.27 A. The ability of the waste to perform this coupled oxidation-sorption reaction in real soils was investigated with a 10% by weight addition of the waste to an industrially As contaminated soil. Electron probe microanalysis showed As accumulation onto the Fe oxide component of the binary oxide waste, which had no As innately. The bioaccessibility of As was also significantly reduced by 7.80% (p < 0.01) with binary oxide waste addition. The results indicate that Fe-Mn binary oxide wastes could provide a potential in situ remediation strategy for As and Pb immobilization in contaminated soils. Crown Copyright (C) 2017 Published by Elsevier B.V. All rights reserved.