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以海藻酸钠(SA)水溶液为活性层铸膜液,分别以聚砜(PSF)、聚丙烯腈(PAN)为基膜,采用涂敷、热处理、交联剂交联的方法制备了荷负电复合纳滤膜,考察了海藻酸钠浓度、基膜、交联剂浓度等对膜性能的影响,制膜条件优化结果为,以聚砜超滤膜为基膜,海藻酸钠铸膜液质量分数为3%,交联剂为质量分数0.5%的硫酸和质量分数1%的戊二醛溶液,30℃下交联24 h,然后在50℃下处理30 min。复合膜在25℃,0.6 MPa的操作条件下,对质量浓度为0.2 g.L-1的Na2SO4、NaCl溶液的截留率分别为88.8%、48.7%;渗透通量分别为5.95、6.33 L.m-.2h-1。
The aqueous solution of sodium alginate (SA) was used as the casting solution of active layer. Polysulfone (PSF) and polyacrylonitrile (PAN) as base films were prepared by coating, heat treatment and cross-linking. Composite nanofiltration membrane, investigated the concentration of sodium alginate, base film, cross-linking agent concentration on the performance of the membrane, membrane conditions optimized results to polysulfone ultrafiltration membrane as the base membrane, sodium alginate casting solution quality The fraction was 3%, the crosslinking agent was 0.5% sulfuric acid and 1% glutaraldehyde solution, crosslinked at 30 ℃ for 24 h and then treated at 50 ℃ for 30 min. Under the operating conditions of 25 ℃ and 0.6 MPa, the rejection of Na2SO4 and NaCl solutions with mass concentration of 0.2 gL-1 were 88.8% and 48.7%, respectively. The permeation fluxes were 5.95 and 6.33 Lm-2h- 1.