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Citation: LIANG Mei-Na, LIU Hai-Ling, LIU Shu-Shen, ZHU Yi-Nian. Preparation of Nanometer-size Iron Oxides and Their Adsorption of As(Ⅴ)[J]. Chinese Journal of Applied Chemistry, ;2007, 24(12): 1418-1423. shu

Preparation of Nanometer-size Iron Oxides and Their Adsorption of As(Ⅴ)

1.
a MOE, Key Laboratory of Changfiang River Water Environment, College of Environmental Science and Technology, Tongfi University, Shanghai 200092;
2.
b Department of Resources and Environmental Engineering, Guilin University of Technology, Guilin

Corresponding author: LIU Hai-Ling,
Received Date: 14 January 2007
Available Online: 1 May 2007
Fund Project: 国家自然科学基金资助项目(40773059) (40773059)上海市重点基础研究计划(06JC14067)资助项目 (06JC14067)广西科学基金(桂林自0728222) (桂林自0728222)广西"新世纪十百千人才工程"专项资金资助项目(2004217) (2004217)

Nanometer-size iron oxides were respectively prepared by homogeneous precipitation,sol-gel phase transfer,and sol-gel evaporation processes,and the preparation conditions were studied and the powders were characterized.Scanning electron microscopy showed that the average grain size was between 100~ 300 nm.The adsorption of As(Ⅴ) on the nanometer-size iron oxides prepared by the different processes under different conditions was compared experimentally.The results indicated that the nanometer-size iron oxides can lower the arsenic concentration to below 0.01 mg/L from 2 mg/L in solution at pH between 4.0 and 6.0.The maximal adsorption capacity of the iron oxides prepared by sol-gel evaporation process was 30.96,30.58 and 17.06 mg/g when the pH was 3,7,and 10,respectively,and the adsorption capacity of the nanometer-size iron oxide thus prepared was greater than that of the other nanometer-size oxides and common block iron oxides.Its adsorption isotherm can be fitted by Langmuir adsorption equation with a correlation coefficient R² of >0.95.
- nanometer-size iron oxide,
- preparation,
- arsenic,
- adsorption
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