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

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	Kinetics and Thermodynamics of Adsorption of VB12 onto Mesoporous Carbon Coated with PMMA
其他题名	Kinetics and Thermodynamics of Adsorption of VB12 onto Mesoporous Carbon Coated with PMMA
	Guo Zhuo 1; Zhang Weiwei 2; Ding Xiangping 1; Li Sha 1; Ma Lei 1
	2010
发表期刊	CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
ISSN	1005-9040
卷号	26 期号:3 页码:431-435
摘要	Ordered mesoporous carbons CMK-3. CMK-1 coated with poly(methyl methaerylate)(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 degrees 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 Delta G(0), Delta H(0) and Delta S(0). The negative value of Gibbs free energy, Delta G(0) indicates that the adsorption occurred via a spontaneous process. The increase in the value of -Delta G(0) with increasing temperature indicates that higher temperatures were favourable to the sorption process. The enthalpy values of Delta H(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.
其他摘要	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.
关键词	MOLECULAR-SIEVES EQUILIBRIUM TEMPLATES REMOVAL Mesoporous carbon VB12 adsorption Equilibrium Kinetics Thermodynamics
收录类别	CSCD
语种	英语
资助项目	[National Natural Science Foundation of China]
CSCD记录号	CSCD:3893170
引用统计	被引频次：1[CSCD] [CSCD记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/141822
专题	中国科学院金属研究所
作者单位	1.中国科学院金属研究所 2.吉林大学
推荐引用方式 GB/T 7714	Guo Zhuo,Zhang Weiwei,Ding Xiangping,et al. Kinetics and Thermodynamics of Adsorption of VB12 onto Mesoporous Carbon Coated with PMMA[J]. CHEMICAL RESEARCH IN CHINESE UNIVERSITIES,2010,26(3):431-435.
APA	Guo Zhuo,Zhang Weiwei,Ding Xiangping,Li Sha,&Ma Lei.(2010).Kinetics and Thermodynamics of Adsorption of VB12 onto Mesoporous Carbon Coated with PMMA.CHEMICAL RESEARCH IN CHINESE UNIVERSITIES,26(3),431-435.
MLA	Guo Zhuo,et al."Kinetics and Thermodynamics of Adsorption of VB12 onto Mesoporous Carbon Coated with PMMA".CHEMICAL RESEARCH IN CHINESE UNIVERSITIES 26.3(2010):431-435.