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Effect of Inorganic Salt Additives on Formation of Phase-Inversion Polyethersulfone Ultrafiltration Membrane  

김민정 (충북대학교 공과대학 화학공학부)
이상덕 (충북대학교 공과대학 화학공학부)
염경호 (충북대학교 공과대학 화학공학부)
Publication Information
Membrane Journal / v.12, no.2, 2002 , pp. 75-89 More about this Journal
Abstract
The effect of addition of inorganic salts in polyethersulfone (PES) polymer solution on the membrane formation and ultrafiltartion performance was studied through the thermodynamic and kinetic properties of casting solution. To control the thermodynamic and kinetic properties of casting solution, various inorganic salts $[CaC1_2, LiCl, LiClO_4, ZnC1_2 $and Mg(ClO_4)_2]$ were added in the PES/NMP solution. Variation of membrane morphology and performance of the resulting membranes with change of the salt type and content added in tasting solution were discussed using viscosity, coagulation value, light transmittance measurement, overall membrane porosity, ultrafiltration experiment and cross-sectional SEM image. For all kind of inorganic salts, according as increase of the salt content in casting solution, viscosity is increased, coagulation value becomes lower, top layer thickness below the skin surface is increased, bovine serum albumin(BSA) rejection decreased and pure water flux is increased except $CaC1_2$ and LiCl. In case of $CaC1_2$ and LiCl, it is found that when the salt content is increased, the formation of macrovoids is suppressed and the precipitation rate becomes slow while instantaneous demixing of precipitation type is maintained. However, in case of $LiClO_4$ and $Mg(ClO_4)_2,$ it is found that precipitation rate becomes faster.
Keywords
membrane formation; phase inversion; polyethersulfone; UF membrane; inorganic salt;
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