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《Acta Materiae Compositae Sinica》 2017-01
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Characteristics and mechanism of uranium(Ⅵ)adsorption by Fe(Ⅱ)-Al LDH

LIU Xingqun;XIE Shuibo;ZENG Fanyong;ZHONG Yu;ZENG Taotao;LIU Yingjiu;Insitute of Urban Construction University of South China;Hunan Province Key Laboratory of Pollution Control and Resources Reuse Technology;College of Environmental Science and Engineering,Hunan University;  
Fe(Ⅱ)-Al layered double hydroxides(Fe-Al LDHs)were prepared by the ultrasound-assisted co-precipitation method and used for the adsorption of uranium(Ⅵ)from aqueous solution.The effects of initial pH,adsorbent dosage,temperature,adsorption time and initial U(Ⅵ)ions concentration on adsorption of U(Ⅵ)were investigated.The prepared composites were characterized by SEM,FTIR,XRD and X-ray photoelectron spectroscopy(XPS).The experiment results indicate that the maximum adsorption occur at pH of 6 and the adsorption reach equilibrium within 120 min.Meanwhile the removal rate is up to 99.98%for initial U(Ⅵ)concentration of 10mg/L and adsorbent dosage of 1.0g/L at 25 ℃,and the maximum adsorption capacity for U(Ⅵ)ions is 117.13mg/g.The experimental data fit well with the Langmuir isotherm model and pseudo-second-order kinetic model(R~2≈1),Adsorption of U(Ⅵ)on Fe(Ⅱ)-Al LDH is primarily due to spontaneous endothermic reaction.The results of SEM、FTIR and XPS show that the structure of Fe(Ⅱ)-Al LDH has no change,chemisorption plays a major role and redox take subsidiary function.
【Key Words】: layered double hydroxides uranium(Ⅵ) mechanism adsorption chemisorption
【Fund】: 国家自然科学基金项目(11175081);; 高等学校博士点基金项目(20134324110003);; 湖南省高校重点实验室创新基金项目(13K085);; 湖南省教育厅优秀青年项目(14B154)
【CateGory Index】: TL941.1
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