Kinetic and equilibrium studies of chromium (Ⅲ) removal from aqueous solution by IRN-77 cation-exchange resin
The kinetic and thermodynamic characteristics of adsorption of Cr (Ⅲ) on IRN77 cation-exchange resin was investigated in the present study.Cr (Ⅲ) sorption on cation-exchange resin IRN77 was studied as a function of time and temperature.The temperature was found to have a positive effect on film and particle diffusion processes.The activation energy was calculated using Arrhenius equation based on the rate constants and indicated that the activation energy of the particle diffusion process was higher than that of the film diffusion process.The film diffusion equation was well-fitted with a correlation coefficient over 0.99.The results showed that the film diffusion process was the rate-limiting step during Cr (Ⅲ) sorption process.After the rate constants of adsorption isotherm of Cr (Ⅲ) obtained from the Langmuir equation,the thermodynamic parameters ΔSs,ΔHθ and ΔGθ were further calculated using the Eyring equation.The ΔSθ and ΔHθ were found to he-128.07 J/mol·K and 42.98 kJ/mol,respectively.The ΔGθ at tempemtttre 298K,313K and 328K were 81.14,83.07 and 84.99 kJ/mol,respectively.The thermodynamic characteristics revealed that the mechanism of Cr (Ⅲit) sorption was endothermic and the entropy-driving ion exchange.
Chromium(Ⅲ) Ion-exchange Langmuir model Kinetics study Film diffusion
Huai Li Jianzheng Li Zifang Chi Weishi Ke
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin School of Environment, Tsinghua University, Beijing 100084, PR China Fujian-Bailin Environmental Technology Co.Ltd., Quanzhou 362271, Fujian Province, PR China
国际会议
The Seventh International Conference on Waste Management and Technology(第七届固体废物管理与技术国际会议(ICWMT7))
北京
英文
646-655
2012-09-05（万方平台首次上网日期，不代表论文的发表时间）