Adsorption Behavior of Methyl Orange onto Modified Ultrafine Coal Powder

The adsorption of methyl orange onto ultrafine coal powder （UCP） and modified ultrafine coal powder （MUCP） from aqueous solutions were studied, in which the influence of contact time, dosage, temperature, pH, and methyl orange concentration in the solution were investigated. The adsorption kinetics...

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Bibliographic Details
Published in:Chinese journal of chemical engineering 2009-12, Vol.17 (6), p.942-948
Main Author: 刘转年 周安宁 王贵荣 赵晓光
Format: Article
Language:English
Subjects:
adsorption
Langmuir等温式
methyl orange
ultrafine coal powder
wastewater treatment
动力学模型
吸附动力学
吸附改性
吸附行为
接触时间
甲基橙
超细煤粉
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Summary:The adsorption of methyl orange onto ultrafine coal powder （UCP） and modified ultrafine coal powder （MUCP） from aqueous solutions were studied, in which the influence of contact time, dosage, temperature, pH, and methyl orange concentration in the solution were investigated. The adsorption kinetics of methyl orange by UCP and MUCP can be described by the Lagergren first-order and pseudo second-order kinetic models, respectively. The adsorption isotherms of methyl orange onto MUCP at 303, 313 and 323 K follow the Freundlich and Langmuir isotherm equation. Values of △G^0 for methyl orange adsorption onto MUCP are -22.55, -23.10 and -23.79 kJ·mol^-1 at 303, 313, and 323 K, respectively. The values of △H^0 and △S^0 are -3.74 kJ· mol^-1 and 61.99 J·mol^-1, respectively. The adsorption process is spontaneous and exothermic.
ISSN:1004-9541
2210-321X
DOI:10.1016/S1004-9541(08)60300-6