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Citation: LUO Gang, ZHANG Quan-Xing, LI Ai-Min, LIU Fu-Qiang, SHAO Li, CHEN Jin-Long. Adsorption and Thermodynamic Properties of Sorbic Acid on the Polymeric Adsorption Resins[J]. Chinese Journal of Applied Chemistry, ;2003, 20(12): 1139-1142. shu

Adsorption and Thermodynamic Properties of Sorbic Acid on the Polymeric Adsorption Resins

1.
State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing 210093

Corresponding author: ZHANG Quan-Xing,
Received Date: 25 March 2003
Available Online: 2 July 2003
Fund Project: 国家自然科学基金资助项目(20274017) (20274017)

The adsorption and thermodynamic behavior of sorbic acid in aqueous solution by three kinds of macroporous polymeric resins:NDA-150, CHA-111 and Amberlite XAD-4 have been investigated by static method. The results show that isotherm adsorption curves of sorbic acid by three polymeric resins all well fit to Freundlich adsorption isotherm equation. The adsorption capacities for sorbic acid on NDA-150 are 1.4~2.4 times and 2.1~4.0 times as high as that on CHA-111 and Amberlite XAD-4 respectively, due to the differences in surface polarity and micropore structure of the resins. The negative values of the adsorption enthalpy ΔH and the absolute values<42 kJ/mol indicate the exothermic physical adsorption character. The study on the free energy of adsorption manifests that there is a rather better pore structure in NDA-150. The negative values of the adsorption entropy ΔS indicate the more restricted mobility of the sorbic acid on the resin surface than in solution.
- macroporous polymeric resin,
- sorbic acid,
- adsorption behavior,
- thermodynamic property
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