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Fabrication of Antifouling Interface of Ultrafiltration Membrane and Study of Its Separation Property

Author: SunMengPing
Tutor: SuYanLei
School: Tianjin University
Course: Chemical processes
Keywords: Pollution Ultrafiltration Membrane Modification Separation performance
CLC: TQ028.8
Type: Master's thesis
Year: 2010
Downloads: 144
Quote: 0
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Abstract


Membrane separation technology is energy efficient new separation technology. But ultrafiltration membrane fouling phenomena appearing cause flux reduction, separation performance deteriorates. In this study, using a variety of modification methods, to build the interface membrane pollution, improve the performance of membrane separation. Membrane surface using chemical modification method, the PAN ultrafilters chemical hydrolysis, hydrolysis of PAN film is obtained. Hydrolysis of membrane surface carboxyl groups further reacted with ethanolamine, to create a hydrophilic membrane surface fouling. XPS and contact angle results show that: the modified amide group content of the film surface increases, membrane hydrophilicity. SEM photographs displayed on the surface of PAN ultrafiltration membrane chemically modified, PAN ultrafiltration membrane remains asymmetric structures. Ultrafiltration experimental data show that: the surface chemical modification can effectively improve the performance of PAN ultrafiltration membrane fouling. With the membrane surface hydrophilic group content increases, the film blank PAN membrane flux recovery rate 47% to 96%, and after repeated use after, PAN hydrolysis of the modified membrane flux recovery rate can still be up to 95%. Preparation of Fluorinated random polyacrylonitrile (PAN-PFMA) copolymer film material, fluorine-containing group to build pollution interface, prepared by phase inversion membrane PAN-PFMA. He inspected the solvent evaporation time on PAN-PFMA ultrafiltration membrane performance. SEM photographs show: PAN-PFMA film section morphology of loose sponge-like structure. With the solvent evaporation time, the film thickness decreased. XPS data showed that: the film surface with the solvent was evaporated fluorine content of the extension of time increased, but the contact angle of the film decreases. By extending the solvent evaporation time, can significantly improve the PAN-PFMA copolymer membrane separation performance and anti-pollution performance. Polyvinylpyrrolidone - composite silica nanoparticles (PVP-silica nanocomposite) as additive pollution interface constructed, prepared with anti-pollution properties of PES / PVP-silica membrane. PVP-silica nanoparticles particle size of about 20-40nm. SEM photos show PVP-silica nanoparticles added PES ultrafiltration membrane did not cause significant changes in membrane structure. XPS data indicate that PVP-silica nanoparticles PVP added to improve the coverage of the membrane surface. PES-PVP membrane relative to the control, PES / PVP-silica has a high flux membrane and a lower recovery rate of protein contamination. Further analysis showed that: PES / silica-PVP modified ultrafiltration membrane fouling mainly from irreversible pollution, water cleaning can easily eliminate reversible pollution.

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CLC: > Industrial Technology > Chemical Industry > General issues > Chemical processes ( physical processes and physical and chemical processes ) > Separation process > New separation method
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