Kinetics and mechanism of the adsorption of methylene blue onto ACFs
The kinetics and mechanism of methylene blue (MB) adsorption onto activated carbon fibers (ACFs) have been studied. The effects of various experimental parameters, such as the initial MB concentration and the ACF mass, on the adsorption rate were investigated. Equilibrium data were fit well by a Fre...
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| Published in | Journal of China University of Mining and Technology Vol. 18; no. 3; pp. 437 - 440 |
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| Main Author | |
| Format | Journal Article |
| Language | English |
| Published |
Elsevier B.V
01.09.2008
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| Subjects | |
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| Abstract | The kinetics and mechanism of methylene blue (MB) adsorption onto activated carbon fibers (ACFs) have been studied. The effects of various experimental parameters, such as the initial MB concentration and the ACF mass, on the adsorption rate were investigated. Equilibrium data were fit well by a Freundlich isotherm equation. Adsorption measurements show that the process is very fast. The adsorption data were modeled using first- and second-order kinetic equations and intra-particle diffusion models. It was found that the first-order kinetic equation could best describe the adsorption kinetics. The adsorption process was found to be complex and controlled by both surface and pore diffusion with surface diffusion at the earlier stages, followed by pore diffusion at the later stages. The thermodynamic parameters ΔG
0, ΔS
0 and ΔH
0, have been calculated. The thermodynamics of the MB-ACF system indicate that the adsorption process is spontaneous. |
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| AbstractList | The kinetics and mechanism of methylene blue (MB) adsorption onto activated carbon fibers (ACFs) have been studied. The effects of various experimental parameters, such as the initial MB concentration and the ACF mass, on the adsorption rate were investigated. Equilibrium data were fit well by a Freundlich isotherm equation. Adsorption measurements show that the process is very fast. The adsorption data were modeled using first- and second-order kinetic equations and intra-particle diffusion models. It was found that the first-order kinetic equation could best describe the adsorption kinetics. The adsorption process was found to be complex and controlled by both surface and pore diffusion with surface diffusion at the earlier stages, followed by pore diffusion at the later stages. The thermodynamic parameters DeltaG0, DeltaS0 and DeltaH0, have been calculated. The thermodynamics of the MB-ACF system indicate that the adsorption process is spontaneous. The kinetics and mechanism of methylene blue (MB) adsorption onto activated carbon fibers (ACFs) have been studied. The effects of various experimental parameters, such as the initial MB concentration and the ACF mass, on the adsorption rate were investigated. Equilibrium data were fit well by a Freundlich isotherm equation. Adsorption measurements show that the process is very fast. The adsorption data were modeled using first- and second-order kinetic equations and intra-particle diffusion models. It was found that the first-order kinetic equation could best describe the adsorption kinetics. The adsorption process was found to be complex and controlled by both surface and pore diffusion with surface diffusion at the earlier stages, followed by pore diffusion at the later stages. The thermodynamic parameters ΔG 0, ΔS 0 and ΔH 0, have been calculated. The thermodynamics of the MB-ACF system indicate that the adsorption process is spontaneous. |
| Author | YANG, Zhi-yuan |
| Author_xml | – sequence: 1 givenname: Zhi-yuan surname: YANG fullname: YANG, Zhi-yuan email: yzy_444@163.com organization: Department of Chemistry & Chemical Engineering, Xi'an University of Science and Technology, Xi'an, Shaanxi 710054, China |
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| Cites_doi | 10.1016/S0032-9592(98)00112-5 10.1016/0021-9797(81)90192-2 10.1016/j.jcis.2005.01.007 10.1002/cjce.5450760419 10.1016/S0043-1354(02)00540-7 10.1016/0926-860X(91)80009-N 10.1016/S0956-053X(00)00076-3 10.1016/S0032-9592(02)00051-1 10.1016/0269-7491(93)90127-A |
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| Title | Kinetics and mechanism of the adsorption of methylene blue onto ACFs |
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