Development of a LCST membrane forming system for cellulose acetate ultrafiltration hollow fiber

摘要

A novel lower critical solution temperature (LCST) membrane forming system containing cellulose acetate (CA)/poly (vinyl pyrrolidone) (PVP 360K)/N-methyl-2-pyrrolidone (NMP)/l,2-propanediol with a weight ratio of 24.0:5.0:62.6:8.4 had been developed.CA hollow fiber ultrafiltration (UF) membranes were fabricated using the dry-wet spinning technique.The fibers were post-treated with a 200 mg/L hypochlorite solution over a period of 6 h at pH 7.The experimental results showed that water flux of a membrane decreased while retention increased with increasing CA concentration in a dope.It was concluded that the membrane pore size decreased with increasing CA concentration.The membrane fouling tendency for BSA was 3 times higher than that for PVP 24K.