Effect of temperature on the sorption and desorption of perfluorooctane sulfonate on humic acid

查看全文 作　　者：Chengxia Jia, Chun You, Gang Pan State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.

出　　处：《Journal of Environmental Sciences》索引2010年第22卷第3期,共7页

基　　金：supported by the National Natural Science Foundation of China (No. 20477050, 20621703) 摘　　要：Sorption and desorption of perfluorooctane sulfonate (PFOS) on humic acid at different temperatures were studied. It was found that the sorption process could be modeled with power kinetic equation very well, suggesting that diflusion predominated the sorption of PFOS on the humic acid. The sorption capacity was doubled when the temperature increased from 5 to 35°C, and thermodynamics parameters △G0 was calculated to be -7.11 to -5.04 kJ/mol, △H0 was 14.2 kJ/mol, and △S 0 was 69.5 J/(mol·K), indicating that the sorption was a spontaneous, endothermic, and entropy driven process. Desorption hysteresis occurred at all studied temperatures which suggested that humic acid may be an important sink of PFOS in the environment. 关键词：吸附过程全氟辛烷腐殖酸磺酸温度解吸动力学方程热力学参数

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Effect of temperature on the sorption and desorption of perfluorooctane sulfonate on humic acid

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