Aquatic environment

Effect of temperature on the sorption and desorption of perfluorooctanesulfonate on humic acid


Chengxia Jia , Chun You , Gang Pan

DOI:

Received May 20, 2009,Revised September 02, 2009, Accepted , Available online

Volume 22,2010,Pages 355-361

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Sorption and desorption of perfluorooctane sulfonate (PFOS) on humic acid at di erent temperatures were studied. It was found that the sorption process could be modeled with power kinetic equation very well, suggesting that di usion 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.

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