Effect of Polyethylene Glycol on Microstructure and Properties of Polyvinyl Chloride Ultrafiltration Membrane
Polyvinyl chloride(PVC)ultrafiltration membrane was prepared through phase inversion method,with polyethylene glycol(PEG)of molecular weight 8 ku serving as the additive and pore-forming agent.The influence of PEG on the structure and performance of PVC ultrafiltration membrane was investigated through the analysis of the viscosity of the casting solution,element composition of membrane surface,membrane microscopic morphology,contact angle of membrane surface,and membrane penetration interception.PVC and PEG were partially compatible system.The addition of PEG resulted in the uniformity of the surface pores of PVC ultrafiltration membrane,enhanced the hydrophilicity of the membrane surface and the nanoscale micropores within the membrane,altered the structure of the finger-like pores inside the ultrafiltration membrane,and was beneficial for water flow penetration.However,insufficient PVC and excessive PEG would lead to the collapse of the functional layer,thereby increasing the mass transfer resistance of water flow.When the mass fraction of the polymer amounted to 19％and the mass ratio of PVC to PEG stood at 17:2,the pure water flux of the ultrafiltration membrane could reach 4.16 L/(m2·h·kPa),and the rejection of bovine serum albumin(BSA)was 96％.After the cyclic treatment of the humic acid solution and cleaning with pure water,the membrane flux recovery rate was 80.3％.The pilot application outcomes demonstrated that the ultrafiltration membrane could lower the turbidity of the effluent to less than 0.1 NTU and could eliminate 100％of E.coli.
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