Journal
JOURNAL OF ENVIRONMENTAL SCIENCES
Volume 22, Issue 3, Pages 355-361Publisher
SCIENCE PRESS
DOI: 10.1016/S1001-0742(09)60115-7
Keywords
perfluorooctane sulfonate; sorption; desorption; temperature; humic acid
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Funding
- National Natural Science Foundation of China [20477050, 20621703]
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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 diffusion predominated the sorption of PFOS on the humic acid. The sorption capacity was doubled when the temperature increased from 5 to 35 degrees C, and thermodynamics parameters Delta G(0) was calculated to be -7.11 to -5.04 kJ/mol, Delta H-0 was 14.2 kJ/mol, and Delta 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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