Removal of hexavalent chromium from water by modified sponge iron particles and insights into mechanism

被引：0
作者：
Guilin Zhu
Junde Song
Weihong Dong
Jingfeng Lu
Yan Wang
Weinan Jiang
Ping Guo
机构：
[1] Jilin University,Key Laboratory of Groundwater Resources and Environment, Ministry of Education
[2] Jilin University,Institute of Water Resources and Environment
[3] Institute of Liaoning Engineering Investigation and Design,College of Construction Engineering
[4] Jilin University,undefined
来源：
Environmental Science and Pollution Research | 2018年 / 25卷
关键词：
Sponge iron; Modified sponge iron; Decontamination; Hexavalent chromium; Removal mechanism;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
Sponge iron particles modified with expanded graphite and Cu were used to purify solutions contaminated with aqueous Cr(VI). A removal mechanism that involved physical adsorption and a redox reaction is proposed. The reaction, which consisted of rapid adsorption, a desorption stage, and an adsorption–desorption equilibrium stage, corresponded to a first-order kinetic model. The properties of the adsorption materials before and after use were investigated by X-ray diffraction, scanning electron microscopy–energy-dispersive spectroscopy, Fourier-transform infrared spectroscopy, energy-dispersive X-ray fluorescence spectroscopy, and surface area measurements. Changes in the surface properties, e.g., attachment of material to the surface and filling of pores with Cr, were clearly observed. The Langmuir model best described Cr(VI) adsorption on the sponge iron and its modified particles. Removal efficiencies of 98.7, 98.8, and 100% were achieved in 7 h at a Cr(VI) dosage of 10 mg/L. Sponge iron particles are therefore potential adsorbents and after modification give good removal of Cr(VI) ions from contaminated water.
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页码：26173 / 26181
页数：8
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