Carbon-coated montmorillonite nanocomposite for the removal of chromium(VI) from aqueous solutions

doi:10.1016/j.jhazmat.2019.01.080

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	Carbon-coated montmorillonite nanocomposite for the removal of chromium(VI) from aqueous solutions
	Wei J; Tu C; Yuan GD; Bi DX; Xiao L; Theng BKG; Wang HL; Ok YS
发表期刊	Journal of Hazardous Materials
ISSN	0304-3894
	2019
卷号	368 页码:541-549
关键词	Carbon-coated montmorillonite Chromium(VI) Adsorption STXM XANES
研究领域	Engineering, Environmental ; Environmental Sciences
DOI	10.1016/j.jhazmat.2019.01.080
产权排序	1
作者部门	海岸带环境过程实验室
英文摘要	A carbon-coated montmorillonite nanocomposite (CMt), obtained by hydrothermal carbonization of montmorillonite suspension in glucose, was used to remove Cr(VI) from aqueous solutions. The distribution and speciation of Cr immobilized by CMt were assessed by transmission electron microscopy with energy-dispersive Xray analysis, X-ray absorption near edge structure (XANES), and scanning transmission soft X-ray microscopy (STXM). The variation in the functional groups and molecular structures of CMt was also investigated. The capacity of CMt for adsorbing Cr(VI) was markedly superior to that of the parent montmorillonite, showing maximum uptake of 100 and 12.4 mg g(-1) at pH 2 and 8, respectively. The Cr K-edge XANES and STXM analyses indicated that Cr(VI) was reduced to Cr(III) under both acidic and alkaline conditions, while a Cr(OH)3 precipitate and Cr(III)-acetate complex were the predominant species present on the CMt surface. The Fourier transform infrared spectroscopy and C K-edge XANES further suggested that the phenolic groups in CMt could serve as electron donors, facilitating Cr(VI) reduction. The combined results indicate that electrostatic attraction, Cr(VI) reduction, complexation, and precipitation are involved in the removal of Cr(VI) by CMt.
文章类型	Article
收录类别	SCI
语种	英语
关键词[WOS]	HYDROTHERMAL CARBONIZATION PROCESS ; HEXAVALENT CHROMIUM ; ORGANIC-MOLECULES ; HEAVY-METALS ; CR(VI) ; ADSORPTION ; ABSORPTION ; REDUCTION ; SOIL ; IMMOBILIZATION
研究领域[WOS]	Engineering, Environmental ; Environmental Sciences
WOS记录号	WOS:000461270900061
引用统计	被引频次：69[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.yic.ac.cn/handle/133337/24146
专题	中国科学院海岸带环境过程与生态修复重点实验室_海岸带环境过程实验室中国科学院烟台海岸带研究所
通讯作者	Yuan GD
推荐引用方式 GB/T 7714	Wei J,Tu C,Yuan GD,et al. Carbon-coated montmorillonite nanocomposite for the removal of chromium(VI) from aqueous solutions[J]. Journal of Hazardous Materials,2019,368:541-549.
APA	Wei J.,Tu C.,Yuan GD.,Bi DX.,Xiao L.,...&Ok YS.(2019).Carbon-coated montmorillonite nanocomposite for the removal of chromium(VI) from aqueous solutions.Journal of Hazardous Materials,368,541-549.
MLA	Wei J,et al."Carbon-coated montmorillonite nanocomposite for the removal of chromium(VI) from aqueous solutions".Journal of Hazardous Materials 368(2019):541-549.