Adsorption of Chloride Anion from Aqueous Solution by Calcined (Mg-Al) Hydrotalcites of Different Mg/Al Ratio
文献类型： 外文期刊
作者： Wan, Dongjin 1 ; Qu, Dan 2 ; Xiao, Hua 3 ; Liu, Yongde 1 ; Lu, Ting 1 ; Xu, Wenqing 4 ;
作者机构： 1.Henan Univ Technol, Sch Chem & Chem Engn, Zhengzhou 450001, Peoples R China
2.Beijing Forestry Univ, Coll Environm Sci & Engn, Beijing 100085, Peoples R China
3.Zhejiang Acad Agr Sci, Inst Environm Resource Soil & Fertilizer, Hangzhou 310021, Zhejiang, Peoples R China
4.Chinese Acad Sci, Inst Proc Engn, Beijing 100190, Peoples R China
关键词： Hydrotalcite;Mg/Al ratio;Chloride;Adsorption;Isotherm
期刊名称：FUNDAMENTAL OF CHEMICAL ENGINEERING, PTS 1-3
ISSN： 1022-6680
年卷期： 2011 年 233-235 卷
页码：
收录情况： SCI
摘要： Hydrotalcites (HT-X) of different Mg/Al ratio (X is Mg/Al molar ratio, 3 and 4) was synthesized by co-precipitation method. Calcined HTLCs (CHT-X) at 500 degrees C have been shown to recover their original layered structure by taking up chloride ion from aqueous solution. Adsorption of chloride by CHT-X was investigated in batch mode. The kinetics study showed that the pseudo-second-order kinetics model could be used to describe the adsorption process satisfactorily. The equilibrium isotherm showed that the Langmuir model gave a better fit to the experimental data than the Freundlich model. The maximum adsorption capacity of CHT-3 was 83.33 mg/g; CHT-4 was 90.09 mg/g. The samples of different Mg/Al ratio have different crystallite size, thus showing different adsorption capacity. As the Mg/Al ratio increases from 3 to 4; the electric charge density between the layers becomes weaker; the interlayer spacing increases; the sample shows greater adsorption capacity. The HT-X where characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), electron dispersive X-ray analysis (EDX).
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