| Kinetics and Thermodynamics of Adsorption of VB12 onto Mesoporous Carbon Coated with PMMA | |
| Alternative Title | Kinetics and Thermodynamics of Adsorption of VB12 onto Mesoporous Carbon Coated with PMMA |
| Guo Zhuo1; Zhang Weiwei2; Ding Xiangping1; Li Sha1; Ma Lei1 | |
| 2010 | |
| Source Publication | CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
 |
| ISSN | 1005-9040 |
| Volume | 26Issue:3Pages:431-435 |
| Abstract | 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. |
| Other Abstract | 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. |
| Keyword | MOLECULAR-SIEVES EQUILIBRIUM TEMPLATES REMOVAL Mesoporous carbon VB12 adsorption Equilibrium Kinetics Thermodynamics |
| Indexed By | CSCD |
| Language | 英语 |
| Funding Project | [National Natural Science Foundation of China] |
| CSCD ID | CSCD:3893170 |
| Citation statistics |
Cited Times:1[CSCD]
[CSCD Record]
|
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/141822 |
| Collection | 中国科学院金属研究所 |
| Affiliation | 1.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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