Kinetic and thermodynamic studies of adsorption of gallium(III) on nano-TiO2
Kinetic and thermodynamic studies of adsorption of gallium(III) on nano-TiO2
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DOI：
10.1007/s12598-010-0003-9
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发表时间：
2010-01
期刊：
影响因子：
8.8
通讯作者：
Lei Zhang;Y. Zhu;Hongmei Li;Na Liu;Xueyan Liu;Xuejun Guo
中科院分区：
文献类型：
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作者：
Lei Zhang;Y. Zhu;Hongmei Li;Na Liu;Xueyan Liu;Xuejun Guo
采用间歇平衡实验研究了纳米TiO 2对水溶液中镓的吸附性能。结果发现，Ga（III）的吸附效率大于96%，在pH 3.0。研究了溶液浓度和温度对纳米TiO 2吸附Ga（III）的影响。使用Langmuir吸附等温线分析结果。吸附等温线可以用Langmuir模型很好地解释。根据D-R吸附等温线计算出平均吸附能为15.81 kJ·mol−1。动力学实验数据符合准二级动力学模型。估算了吸附过程的热力学参数。Ga（III）在纳米TiO 2上的吸附Δ H_（max）和Δ G_（max）值显示出吸热和自发的吸附性质。
Nano-TiO2was employed for the adsorption of gallium from aqueous solution in batch equilibrium experiments to investigate its adsorption properties. It was found that the adsorption efficiency of Ga(III) was more than 96% at pH 3.0. The adsorption capacities and rates of Ga(III) onto nano-TiO2were evaluated as a function of solution concentration and temperature. The results were analyzed using the Langmuir adsorption isotherms. Adsorption isothermal data could be well interpreted by the Langmuir model. The mean energy of adsorption, 15.81 kJ·mol−1, was calculated from the D-R adsorption isotherm. The kinetic experimental data properly correlate with the pseudo-second-order kinetic model. The thermodynamic parameters for the process of adsorption have been estimated. The ΔHƟand ΔGƟvalues of gallium(III) adsorption on nano-TiO2showed an endothermic and spontaneous nature of adsorption.