Effective removal of heavy metal ions by attapulgite supported sulfidized nanoscale zerovalent iron from aqueous solution

doi:10.1016/j.colsurfa.2021.128192

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	Effective removal of heavy metal ions by attapulgite supported sulfidized nanoscale zerovalent iron from aqueous solution
	Chen, Minzhang 1,2; Xu, Hui 1,2; Zhang, Yajuan 1,2; Zhao, Xuefang 1,2; Chen, Yong 1,2; Kong, Xiuqin 1,2
刊名	Colloids and Surfaces A: Physicochemical and Engineering Aspects
	2022-05-05
卷号	640
关键词	Activation energy Adsorption Chemicals removal (water treatment) Chromium compounds Copper compounds Heavy metals Iron compounds Metal ions Morphology Nanostructured materials Redox reactions Sulfur compounds Thermoanalysis Attapulgites Effective removals Heavy metal ion Nano scale Nano zero-valent irons Nano-scale zero valent irons Nanoscale zero-valent iron Removal of heavy metal ions Removal process Sulphur-modified
ISSN号	0927-7757
DOI	10.1016/j.colsurfa.2021.128192
英文摘要	Sulfidation of nanoscale zero valent iron (nZVI) has attracted increasing interest for improving the reactivity and selectivity of nZVI towards heavy metal ions. In this study, attapulgite-loaded sulfide modified nZVI (APT/S-nZVI) was synthesized, and used for removal Cr(), Cu() and Zn() alone or coexisting. The morphology and structure characterizations indicated that sulfide-modified nZVI particles were well distributed and immobilized on the attapulgite surface. Batch experiments of Cr(), Cu() and Zn() removal were conducted at varying mass ratios, S/Fe ratios, pH and initial concentrations. Moreover, kinetic and thermodynamic analyses were used to study the removal process, and possible mechanisms of removal for Cr(), Cu() and Zn() were discussed. The results of removal performance tests demonstrated that APT/S-nZVI displayed high removal capacity and fast removal rate for three heavy metal ions compared to the nZVI, which derived from the synergistic effects of the strongly reducing characteristics of nZVI combined with high electronic conductivity of FeS and high surface area of APT. Dynamic studies revealed that the removal process was highly consistent with the pseudo-second-order model for three metal ions adsorption and reaction process. Additionally, combined the value of activation energy, it has been proved that the removal Cr(VI) and Cu() were controlled by chemical surface-limiting step, and removal Zn() was controlled by chemically diffusion step. The modification of S changes the removal mechanism between APT/S-nZVI and metal ions, which is closely related to the redox potential of metal ion and the solubility product constant (Ksp) of metal sulfides. Overall, the work suggests that APT/S-nZVI has a good potential for the elimination of micropollutants in the aquatic environment. © 2022
WOS研究方向	Chemistry
语种	英语
出版者	Elsevier B.V.
WOS记录号	WOS:000765944700002
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/157923]
专题	石油化工学院
作者单位	1.College of Petrochemical Technology, Lanzhou University of Technology, Lanzhou, China; 2.Key Laboratory of Low Carbon Energy and Chemical Engineering of Gansu Province, China
推荐引用方式 GB/T 7714	Chen, Minzhang,Xu, Hui,Zhang, Yajuan,et al. Effective removal of heavy metal ions by attapulgite supported sulfidized nanoscale zerovalent iron from aqueous solution[J]. Colloids and Surfaces A: Physicochemical and Engineering Aspects,2022,640.
APA	Chen, Minzhang,Xu, Hui,Zhang, Yajuan,Zhao, Xuefang,Chen, Yong,&Kong, Xiuqin.(2022).Effective removal of heavy metal ions by attapulgite supported sulfidized nanoscale zerovalent iron from aqueous solution.Colloids and Surfaces A: Physicochemical and Engineering Aspects,640.
MLA	Chen, Minzhang,et al."Effective removal of heavy metal ions by attapulgite supported sulfidized nanoscale zerovalent iron from aqueous solution".Colloids and Surfaces A: Physicochemical and Engineering Aspects 640(2022).