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The Mechanism Study on the Effect of Additives on the Structure of Reverse Osmosis Support Membrane

Author: WangLiYa
Tutor: QianXin；ZhouYong
School: Zhejiang University of Technology
Course: Materials Science
Keywords: Polysulfone Ultrafiltration membrane Water Surfactant Phase inversion
CLC: TB383.2
Type: Master's thesis
Year: 2010
Downloads: 30
Quote: 1
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Abstract


The topics to polysulfone (PSF) is a film material , N, N- dimethyl acetamide (DMAc) as solvent and non - solvent additives in water, a surfactant ( sodium dodecyl sulfate , nonylphenol polyethylene polyoxyethylene ether phosphate , TritonX100 TritonX114 ) for the additive , water as the coagulation bath , the precipitate was immersed in a constant temperature and humidity conditions , by ultrafiltration membranes prepared by phase inversion . Different molecular weight of polysulfone membrane material impact on the casting solution viscosity and membrane structure and performance , different additives and content on the viscosity of the casting solution and membrane structure and properties , and phase inversion formation mechanism analysis , then explore the casting solution temperature, solvent evaporation , solvent composition changes on the membrane structure and performance . The results show that the molecular weight polysulfone casting solution viscosity is relatively high, the film table face and a smaller aperture , slightly lower than the pure water flux of the membrane , the rejection rate has increased ; non-solvent additive water . the increase of the added amount can cause the cast film fluid viscosity increases , the pure water flux of the membrane increases , the rejection rate is decreased . Polysulfone membrane casting solution viscosity with the increase of the added amount of the surfactant , the four add surfactant showed a downward trend after the first increase in the pure water flux of the membrane also appeared in the first and then decreases law , but the rejection rate is decreased . Polysulfone casting solution viscosity decreased with the cast of the film liquid temperature rises , the membrane water flux behavior first and then decreases with the increase in temperature of the casting solution , the retention rate , exhibits the opposite trend. Polysulfone membrane with whether adding a surfactant , polysulfone membrane water flux phenomenon decreases and then increases , the retention rate first increases and then decreases with the extension of time of solvent evaporation , addition of surfactant the sponge - like pore structure with a solvent evaporation time extended finger hole almost disappeared . Polysulfone membrane casting solution to DMC / DMAC as a mixed solvent system of the film accompanied by the increase in the amount of pure water add pure water flux appears first increased and then decreased , the rejection rate has remained downward trend .

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