Enhanced removal of chromate by graphene-based sulfate and chloride green rust nanocomposites

被引：16
作者：
Alidokht, Leila [1 ]
Oustan, Shahin [1 ]
Khataee, Alireza [2 ]
Neyshabouri, Mohammad R. [1 ]
Reyhanitabar, Adel [1 ]
机构：
[1] Univ Tabriz, Dept Soil Sci, Fac Agr, Tabriz, Iran
[2] Univ Tabriz, Fac Chem, Dept Appl Chem, Res Lab Adv Water & Wastewater Treatment Proc, Tabriz, Iran
来源：
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS | 2016年 / 68卷
关键词：
Green rust; Chromate reduction; Graphene; Nanocomposite; REDUCTION; CARBONATE; KINETICS; IRON; DECHLORINATION; MECHANISMS; SURFACE; ANION; OXIDE;
D O I：
10.1016/j.jtice.2016.09.004
中图分类号：
TQ [化学工业];
学科分类号：
0817 ;
摘要：
Green rust, a double layered (Fe-II, Fe-III) hydroxide, can impact the mobility and toxicity of highly reactive contaminants such as chromate through reduction of Cr-VI to Cr-III. The reduction of Cr-VI by sulfate and chloride green rusts (GRs) was comparatively studied for a range of initial Cr-VI concentrations and pH values. At an equal molar ratio of Cr-VI to Fe-II in GR, sulfate green rust (GRSO(4)) removed higher amounts of Cr-VI from solution than chloride green rust (GRC1). The rate of the reactions with respect to initial concentration of Cr-VI is well described by pseudo-second order model. The GRCI reacted with chromate much faster than GRSO(4). The obtained pseudo-second order rate coefficients for the GRC1 and GRSO(4) ranged from 99.53 to 14.24 and 35.45 to 4.53 mmol/s; respectively. Graphene-based green rust nanocomposites were prepared using partially reduced graphene (PRG) and examined for removal of Cr-VI. The efficiency of Cr-VI removal by GRSO(4)/PRG and GRCl/PRG nanocomposites was dependent on the mass ratio of PRG to total Fe precipitated as GR (PRG:Fe-(s)) and the highest removal was observed at PRG:Fe-(s) mass ratios of 1:2. In comparison with bare GRs, the GR/PRG nanocomposites removed higher amounts of Cr-VI from solution. However, the reduction rates of Cr-VI by GR/PRG nanocomposites were similar to 2 to 3-fold lower than those observed by bare GRs in both sulfate and chloride systems. (C) 2016 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
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收藏
页码：266 / 274
页数：9
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