Thermodynamics and kinetics of cadmium ions adsorption by nanoscale humic acid

被引：0

作者：

Cheng, Liang ^{[1
]}

Hou, Cui-Hong ^{[1
]}

Liu, Guo-Ji ^{[1
]}

Zhang, Bao-Lin ^{[1
]}

机构：

[1] School of Chemical Engineering and Energy, Zhengzhou University, Zhengzhou

来源：

Gao Xiao Hua Xue Gong Cheng Xue Bao/Journal of Chemical Engineering of Chinese Universities | 2015年 / 29卷 / 01期

关键词：

Adsorption performance; Cadmuim ions; Kinetics; Nanoscale humic acid; Thermodynamics;

D O I：

10.3969/j.issn.1003-9015.2015.01.010

中图分类号：

学科分类号：

摘要：

Nanoscale humic acid was prepared by alkali-solution/acid-isolation together with high shearing methods, which was used in the adsorption of cadmium ions. The prepared acid was characterized by means of AFM, FT-IR, SEM and BET, and the static equilibrium adsorption isotherm and adsorption kinetic curves were obtained. The results show that the adsorption process follows the Freundlich isothermal adsorption model. The enthalpy change at temperatures of 288~308 K is 24.22 kJ·mol-1, which suggests that adsorption process is endo-thermic. The adsorption kinetics follows the psendo-second-order equation and the apparent activition energy is 25.58 kJ·mol-1. This result indicates that the adsorption process is chemical reaction controlled rather than diffusion controlled. The adsorption capacity decreases 18.9% after 5 times of acid reusing and this result demonstrates that the adsorbent has good regenerability. ©, 2015, Zhejiang University. All right reserved.

引用

页码：72 / 77

页数：5

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