Beijing Huagong Daxue Xuebao (Ziran Kexueban)/Journal of Beijing University of Chemical Technology (Natural Science Edition)
Volume 43, Issue 2, 1 February 2016, Pages 6-11, ISSN: 16714628
Li, P., Li, Y., Ye, F., Cao, B.
Abstract
Nanofiltration (NF) membranes based on polyarylene sulfide sulfone (PASS) have been prepared by an immersion precipitation method using pure water as the coagulation bath. The effects of varying the preparation parameters, including (1) polymer concentration, (2) preparation temperature, and (3) air exposure time, on the microstructure and separation performance of the resulting PASS membranes, including water flux and rejection of dyes, were investigated in detail. The optimal membrane preparation parameters were found to be: 22% PASS mass fraction, a doping temperature of 80 ℃, and 0 s exposure time. Under these conditions, the obtained PASS membrane exhibited a pure water flux of 50.0 L/(m2·h), a water flux of 0.01% of congo red (CR) solution of 47.6 L/(m2·h) with a 96.0% rejection to CR. The structures of the membranes were characterized by scanning electron microscopy (SEM). The effects of different organic solvents including toluene, diethyl ether, methanol, ethyl acetate, and n-hexane, as well as sodium hydroxide (1 mol/L) and hydrochloric acid (1 mol/L) solutions on the separation performance with 0.01% mass fraction of congo red solution were systematically studied. Specifically, the PASS membranes were soaked in the above mentioned solvents for 1 day or 7 days, and their separation performance was then evaluated. The results showed that the water fluxes were significantly changed but the rejections to CR were similar. Hence, the PASS membrane had excellent solvent resistance. © 2016, Beijing University of Chemical Technology. All right reserved.
