Efficient Removal of Cr(Ⅵ) from Aqueous Solution with Fe@Fe2O3 Core-Shell Nanowires

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• 作者：Zhihui AiYing ChengLizhi ZhangJianrong Qiu
• 会议时间：2012-11-10
• 关键词：Removal ; Chromium (Ⅵ) ; Adsorption isotherms ; Adsorption kinetics ; Core-shell Fe@Fe2O3 nanowires
• 作者单位：Zhihui Ai(Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, College of Chemistry, Central China Normal University, Wuhan 430079, People's Republic of China ;National Coal Combustion Laboratory, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China)Ying Cheng,Lizhi Zhang(Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, College of Chemistry, Central China Normal University, Wuhan 430079, People's Republic of China)Jianrong Qiu(National Coal Combustion Laboratory, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China)
• 母体文献：第二届重金属污染防治技术及风险评价研讨会暨重金属污染防治专业委会2012年首届学术年会论文集
• 会议名称：第二届重金属污染防治技术及风险评价研讨会暨重金属污染防治专业委会2012年首届学术年会
• 主办单位：中国环境科学学会
• 语种：chi

摘要

The batch removal of Cr(Ⅵ) from simulated wastewater with Fe@Fe2O3 core-shell nanowires (FCSNs) was investigated in this study.It was found each gram of the FCSNs could remove 7.78 mg of Cr(Ⅵ) from simulated wastewater containing 8.0 mg·L-1 of Cr(Ⅵ) with an initial pH of 6.5 at room temperature.Freundlich adsorption isotherm was applicable to describe the removal processes.Kinetics of the Cr(Ⅵ) removal was found to follow pseudo-second-order rate equation.Furthermore,the as-prepared and Cr(Ⅵ)-adsorbed FCSNs were carefully examined by scanning electron microscopy (SEM),energy dispersive X-ray analysis (EDX),Fourier transform infrared spectroscopy (FT-IR),and X-ray photoelectron spectroscopic analysis (XPS).The characterization results suggested the adsorbed Cr(Ⅵ) was partially reduced to Cr(Ⅲ) in Cr2O3/Cr(OH)3 nature on the FCSNs.The possible mechanism of removal of Cr(Ⅵ) on FCSNs was proposed,which involved the dominant Cr(Ⅵ) adsorption followed with the partial reduction of Cr(Ⅵ) to Cr(Ⅲ) (chromium (Ⅲ) oxyhydroides) on the surface of FCSNs.These Fe@Fe2O3 core-shell nanowires with high specific surface area and strong magnetic property are very attractive for the removal of Cr(Ⅵ) from wastewater.