Behaviors and kinetics of toluene adsorption-desorption on activated carbons with varying pore structure

Journal of Environmental Sciences (China)
Xi YangXiaoxu Cui

Abstract

This work was undertaken to investigate the behaviors and kinetics of toluene adsorption and desorption on activated carbons with varying pore structure. Five kinds of activated carbon from different raw materials were selected. Adsorption isotherms and breakthrough curves for toluene were measured. Langmuir and Freundlich equations were fitted to the equilibrium data, and the Freundlich equation was more suitable for simulating toluene adsorption. The process consisted of monolayer, multilayer and partial active site adsorption types. The effect of the pore structure of the activated carbons on toluene adsorption capacity was investigated. The quasi-first-order model was more suitable for describing the process than the quasi-second-order model. The adsorption data was also modeled by the internal particle diffusion model and it was found that the adsorption process could be divided into three stages. In the external surface adsorption process, the rate depended on the specific surface area. During the particle diffusion stage, pore structure and volume were the main factors affecting adsorption rate. In the final equilibrium stage, the rate was determined by the ratio of meso- and macro-pores to total pore volume. The rate ov...Continue Reading

Citations

Dec 16, 2018·Environmental Science and Pollution Research International·Amira AbdelraheemMarwa Elkady
Apr 12, 2019·Environmental Science and Pollution Research International·Junchao ZhuLiqing Li
Feb 23, 2018·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Diana Hernández-MonjeJuan Carlos Moreno-Piraján
Nov 20, 2020·The Science of the Total Environment·Willis GwenziMunyaradzi Mtisi
Feb 7, 2021·Nanomaterials·Yeongkyun SonYuhoon Hwang
Jul 3, 2021·Journal of Environmental Sciences (China)·Wenhao WuKun Yang
Oct 29, 2021·Environmental Science and Pollution Research International·Cunxi ChengYuming Zheng

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