吸附
化学
五氯苯酚
吸热过程
氯酚
离子强度
热力学
无机化学
吸附
物理化学
有机化学
水溶液
苯酚
物理
作者
Mara Cea,John C. Seaman,Alejandra A. Jara,Marı́a de la Luz Mora,M.C. Díez
出处
期刊:Chemosphere
[Elsevier]
日期:2010-01-01
卷期号:78 (2): 86-91
被引量:34
标识
DOI:10.1016/j.chemosphere.2009.10.040
摘要
The sorption of 2,4-dichlorophenol, 2,4,6-trichlorophenol, and pentachlorophenol by a allophanic soil was studied in a series of batch experiments. Chlorophenol sorption behavior was evaluated as a function of reaction time (0-96h) and input concentration at a fixed ionic strength (0.1mol L(-1) KCl) at 25, 35, and 45 degrees C. Sorption results for the various reaction temperatures were used in calculating thermodynamic parameters. Chlorophenol sorption increased with temperature, suggesting an endothermic process. The Elovich equation was used to describe the kinetic data. Data from the isotherm experiments were described by the Triple-Layer Model in which monodentate outer- and inner-sphere complexes were formed between deprotonated organic molecules and active sites on the variable-charge soil. The calculated thermodynamic parameters suggest that chlorophenol sorption is a spontaneous (DeltaG<0), endothermic (DeltaH>0) and entropy-driven reaction (DeltaS>0).
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