Abstract
Gas sorption and transport properties of ozone-treated polysulfone (PSF) were investigated. Ozone treatment of PSF was made by the exposure of PSF to ozone-containing oxygen for certain hours. Gas sorption isotherms for PSF were made for N 2, O 2, CH 4 and CO 2, and sorption data were analyzed by the dual-mode sorption model. Overall sorption for each gas except CO 2 decreased after ozone treatment of PSF. Dual sorption parameters k D and b decreased and C H′ increased for all the gases after ozone treatment. Diffusion coefficients were calculated by the equation P= DS. The diffusion coefficient of each gas decreased after ozone treatment. The increase in the ideal selectivity of ozone-treated PSF, α(O 2/N 2) was more affected by the difference in diffusion coefficients between ozone-treated PSF and untreated PSF than by the difference in solubility coefficients. However, α(CO 2/CH 4) was affected by differences in solubility coefficients as well as diffusion coefficients.
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