Removal of diclofenac from aqueous solution with multi-walled carbon nanotubes modified by nitric acid

doi:10.1016/j.cjche.2015.06.010

摘要/Abstract

摘要： Modified multi-walled carbon nanotubes (MWCNTs) were used as adsorbents for removal of diclofenac. The reaction conditions were examined. Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich isotherm models were applied to determine appropriate equilibrium expression. The results show that the experimental data fit the Freundlich equation well. Thermodynamic parameters show that the adsorption process is spontaneous and exothermic. The kinetic study indicates that the adsorption of diclofenac can be well described with the pseudo-second-order kinetic model and the process is controlled by multiple steps.

关键词: Diclofenac, Multi-walled carbon nanotubes, Adsorption, Isotherm equilibrium, Thermodynamic, Kinetic modeling

Abstract: Modified multi-walled carbon nanotubes (MWCNTs) were used as adsorbents for removal of diclofenac. The reaction conditions were examined. Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich isotherm models were applied to determine appropriate equilibrium expression. The results show that the experimental data fit the Freundlich equation well. Thermodynamic parameters show that the adsorption process is spontaneous and exothermic. The kinetic study indicates that the adsorption of diclofenac can be well described with the pseudo-second-order kinetic model and the process is controlled by multiple steps.

Key words: Diclofenac, Multi-walled carbon nanotubes, Adsorption, Isotherm equilibrium, Thermodynamic, Kinetic modeling

Xiang Hu, Zhao Cheng. Removal of diclofenac from aqueous solution with multi-walled carbon nanotubes modified by nitric acid[J]. , 2015, 23(9): 1551-1556.

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