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Combined modification of clay with sulfhydryl and iron: Toxicity alleviation in Cr-contaminated soils for mustard (Brassica juncea) growth

文献类型： 外文期刊

作者： Fei, Yingheng 2 ; Liu, Chengshuai 1 ; Li, Fangbai 3 ; Chen, Manjia 3 ; Tong, Hui 3 ; Liu, Chuanping 3 ; Liao, Changzho 1 ;

作者机构： 1.Chinese Acad Sci, Inst Geochem, State Key Lab Environm Geochem, Guiyang 550081, Peoples R China

2.Chinese Acad Sci, Guangzhou Inst Adv Technol, Guangzhou 511458, Guangdong, Peoples R China

3.Guangdong Inst Ecoenvironm & Soil Sci, Guangdong Key Lab Agr Environm Pollut Integrated, Guangzhou 510650, Guangdong, Peoples R China

关键词： Bentonite;Chromium;Soil remediation;Thiol modification;Thiol/Fe modification

期刊名称：JOURNAL OF GEOCHEMICAL EXPLORATION （ 影响因子：3.746； 五年影响因子：4.362 ）

ISSN： 0375-6742

年卷期： 2017 年 176 卷

页码：

收录情况： SCI

摘要： Clays are promising adsorbents for heavy metal removal from the environment because they are economical, naturally abundant and environmentally stable. Application of natural clays, however, are typically limited due to their adsorption capacity and because they usually possess little redox potential except for some specific clays with special functional groups, restricting their application in the removal and detoxification of oxidized metal ions, such as Cr(VI). In the present study, natural bentonite was modified with thiol and iron functional groups to improve both its adsorption performance and reduction ability. Material characterization techniques confirmed the success of grafting the thiol group and pillaring the reduced Fe in the clay. Batch adsorption tests demonstrated an enhanced Cr-adsorption capability of the functionalized bentonite. Moreover, the reduced product, Cr(III),was accumulated in the reaction system, indicating a decrease in Cr(VI) toxicity due to its reduction to Cr(III)by the reduced iron functional group in the modified clay. Pot experiments, using mustard as the target seedling, further demonstrated that the thiol/Fe-modified clay could efficiently stabilize and detoxify Cr(VI) in the soil, therefore inhibiting its accumulation in the crop tissues and ultimately improving plant growth. The results suggested that this novel clay modified with sulfhydryl and iron might be a promising material for the stabilization and toxicity alleviation of Cr(VI)-contaminated soils. (C) 2016 Elsevier B.V. All rights reserved.

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