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

doi:10.1016/j.jhazmat.2019.01.080

CORC > 烟台海岸带研究所 > 中国科学院烟台海岸带研究所 > 中科院海岸带环境过程与生态修复重点实验室 > 近岸生态与环境实验室

	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
刊名	Journal of Hazardous Materials
	2019
卷号	368 页码:541-549
关键词	Carbon-coated montmorillonite Chromium(VI) Adsorption STXM XANES
ISSN号	0304-3894
DOI	10.1016/j.jhazmat.2019.01.080
产权排序	1
文献子类	Article
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.
WOS关键词	HYDROTHERMAL CARBONIZATION PROCESS ; HEXAVALENT CHROMIUM ; ORGANIC-MOLECULES ; HEAVY-METALS ; CR(VI) ; ADSORPTION ; ABSORPTION ; REDUCTION ; SOIL ; IMMOBILIZATION
WOS研究方向	Engineering, Environmental ; Environmental Sciences
语种	英语
WOS记录号	WOS:000461270900061
内容类型	期刊论文
源URL	[http://ir.yic.ac.cn/handle/133337/24146]
专题	烟台海岸带研究所_近岸生态与环境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.