南京理工大学学报（自然科学版）2013，Vol.37Issue(1)：156-163,8.
粉末活性炭吸附水中ClO-2的热力学及动力学研究
Thermodynamics and kinetics for sorption of chlorite on powdered activated carbon from water
摘要
Abstract
To explore the rate-control mechanism of the sorption of chlorite on powdered activated carbon(PAC)from water, isotherms and mechanism of the sorption are studied by using the beaker stirring experiments under the pH and temperature of conventional water treatment. Thermodynamic characteristics of the sorption are explored using Langmuir and Freundlich models to fit the sorption isotherms data. Mechanism and rate-control steps of the sorption are studied using pseudo-first-order, pseudo-second-order,intraparticle diffusion and film diffusion kinetic models to analyze the kinetic data of the sorption. Results show that the sorption process of chlorite on PAC is found to be a spontaneous and endothermic process with the mechanism of chemisorption, and the apparent activation energy of the sorption is calculated to be about 53 kJ/mol. The sorption of chlorite on PAC is favorable at pH = 6, and the equilibrium uptake of sorption increases with the increase of the initial chlorite concentration and the temperature. The sorption isotherms are well described by Freundlich model,and the sorption kinetics fits well the pseudo-second-order model. The results prove that the chemisorption reaction is the main rate-control mechanism of the sorption of chlorite on PAC.
关键词
粉末活性炭/亚氯酸盐/吸附/热力学/动力学Key words
powdered activated carbon/ chlorite/ sorption/ thermodynamics/ kinetics分类
建筑与水利引用本文复制引用
李新杰,蒋丹丹,张跃军..粉末活性炭吸附水中ClO-2的热力学及动力学研究[J].南京理工大学学报（自然科学版）,2013,37(1):156-163,8.
