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Kinetics and Thermodynamics of Adsorption of VB12 onto Mesoporous Carbon Coated with PMMA
Alternative TitleKinetics and Thermodynamics of Adsorption of VB12 onto Mesoporous Carbon Coated with PMMA
Guo Zhuo1; Zhang Weiwei2; Ding Xiangping1; Li Sha1; Ma Lei1
2010
Source PublicationCHEMICAL RESEARCH IN CHINESE UNIVERSITIES
ISSN1005-9040
Volume26Issue:3Pages:431-435
AbstractOrdered 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.
Other AbstractOrdered 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.
KeywordMOLECULAR-SIEVES EQUILIBRIUM TEMPLATES REMOVAL Mesoporous carbon VB12 adsorption Equilibrium Kinetics Thermodynamics
Indexed ByCSCD
Language英语
Funding Project[National Natural Science Foundation of China]
CSCD IDCSCD:3893170
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/141822
Collection中国科学院金属研究所
Affiliation1.中国科学院金属研究所
2.吉林大学
Recommended Citation
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.
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