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Kinetics and Thermodynamics of Adsorption of VB12 onto Mesoporous Carbon Coated with PMMA

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Guo Zhuo 1 *   Zhang Weiwei 2   Ding Xiangping 3   Li Sha 3   Ma Lei 3  
文摘 Ordered mesoporous carbons CMK-3, CMK-1 coated with poly(methyl methacrylate)(PMMA)(CMK-3-PMMA and CMK-1-PMMA) and pristine mesoporous carbons CMK-3, CMK-1 were employed to adsorb vitamin B12(VB12) from water solution. Adsorption isotherm and kinetics of adsorption were investigated via batch experiments. It was found that the adsorption capacity of VB12 at 30, 40 and 50 °C can reach 688.2, 572.4 and 428.7 mg/g, respectively. The adsorption isotherm can be described by Langmuir model. The pseudo first-and second-order kinetic models were employed to fit the dynamic adsorption. It was found that the dynamic adsorption follows the pseudo second-order model. The thermodynamic equilibrium coefficients obtained at different temperatures were used to evaluate the thermodynamic constants ΔG~0, ΔH~0 and ΔS~0. The negative value of Gibbs free energy, ΔG~0 indicates that the adsorption occurred via a spontaneous process. The increase in the value of –ΔG~0 with increasing temperature indicates that higher temperatures were favourable to the sorption process. The enthalpy values of ΔH~0<40 kJ/mol(66.36 kJ/mol and 56.43 kJ/mol) for CMK-3-PMMA and CMK-1-PMMA confirm that chemisorption were involved in the adsorption process. This is consistent with the IR spectra and is another evidence for the formation of hydrogen bond between PMMA in the pore of CMK-3 and VB12.
来源 Chemical Research in Chinese Universities ,2010,26(3):431-435 【核心库】
关键词 Mesoporous carbon ; VB12 adsorption ; Equilibrium ; Kinetics ; Thermodynamics
地址

1. School of Materials Science and Engineering, Shenyang Institute of Chemical Technology, State Key Laboratory of Inorgnic Synthesis and Preparative Chemistry, Shenyang, 110142  

2. Jilin University, State Key Laboratory of Inorgnic Synthesis and Preparative Chemistry, Changchun, 130012  

3. School of Materials Science and Engineering, Shenyang Institute of Chemical Technology, Shenyang, 110142

语种 英文
文献类型 研究性论文
ISSN 1005-9040
学科 化学
基金 国家自然科学基金
文献收藏号 CSCD:3893170

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