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Thermodynamics and kinetics for sorption of chlorite on powdered activated carbon from water


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Thermodynamics and kinetics for sorption of chlorite on powdered activated carbon from water
Li XinjieJiang DandanZhang Yuejun
School of Chemical Engineering,NUST,Nanjing 210094,China
powdered activated carbonchloritesorptionthermodynamicskinetics
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.


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Last Update: 2013-02-15