Ozone resistance of polyethersulfone（PES） and polyvinylidene fluoride（PVDF） ultrafiltration membranes
LI Kai, XU Wei-hua, SU Qian, WEN Gang, HUANG Ting-lin
Collaborative Innovation Center of Water Pollution Control and Water Quality Security Assurance of Shaanxi Province, Shaanxi Key Laboratory of Environmental Engineering, Key Laboratory of Northwest Water Resource, Environment and Ecology, Ministry of Education, Xi'an University of Architecture and Technology, Xi'an 710055, China
Abstract：The effect of ozone on permeability, retention ability and mechanical properties of polyethersulfone(PES) and polyvinylidene fluoride(PVDF) membranes were investigated by static immersion experiments, and the changes in chemical composition and properties of PES and PVDF ultrafiltration membranes were analyzed. The pure water permeability of PES membrane increased to more than 3 times of the original membrane and the retention rate of humic acid(HA) by ozonated membrane decreased to about 0 after exposed to saturated ozonated water for 2h at room temperature(20±1)℃. Combing the analysis of composition and properties of the membrane surface, the hydrophilic additives polyvinylpyrrolidone(PVP) were oxidized, while PES molecules were seriously degraded, leading the destruction of the structure and function of PES separation layer. For the PVDF membrane, the pure water permeability of ozonated membrane was about 1.4 times of the original membrane and the HA rejection rate decreased from 61.1% to 41.2% after exposure to saturated ozonated water for 1 h. Moreover, the performances of the ozonated membranes did not further decrease with the extension of the exposure time. The analysis of the composition and properties of the membrane surface showed that the damage of the separation layer of PVDF membrane was mainly caused by the oxidation and loss of PVP, and PVDF matrix was not decomposed. The ozone resistance of PVDF membrane separation layer was significantly higher than that of PES membrane, but the mechanical properties of both membranes were significantly decreased by ozonation.
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