摘要
酚酞基聚芳醚酮(PEK-C)超滤膜的表面通过紫外辐照接枝丙烯酸(AA)可以制备对II价盐有很好截留率的亲水性纳滤膜.FTIR-ATR、表面接触角、SEM和AFM的研究结果表明,在接枝单体溶液中加入异丙醇(i-PrOH)作为链转移剂并不影响AA在PEK-C超滤膜表面的接枝反应.得到的改性膜同样具有优良的纳滤性能.与不加i-PrOH的AA改性膜相比,新合成的膜有较高的滤出液通量,该膜对盐离子的截留率虽有所降低,但可以通过增加接枝反应时间和辐照光源的强度来提高.i-PrOH的浓度对膜的分离性能的影响很大,在低浓度时,改性膜对离子的截留率会有所下降,继续提高i-PrOH的浓度,膜的截留率不再变化而滤出液通量会有成倍的增加,表明链转移剂的存在可能会提高膜的接枝密度,增加膜的表面电荷,使膜对离子的截留率保持不变.
Hydrophilic nanofiltration membranes with good retention to bivalent salts were prepared by graft polymerization of acrylic acid （AA） onto surface of cardo polyetherketone （PEK-C） ultrafiltration membranes. The influence of isopropanol （i-PrOH） as transfer agent on the graft polymerization and the performance of nanofiltration membranes were studied. The results of FTIR-ATR, contact angle, SEM and AFM showed that the presence of i-PrOH did not disturb the graft polymerization of AA. It was in favor of membrane permeation increase. Although the retention to salts was a little decreased, it could be improved by increasing the irradiation time or irradiation intensity. It was found that when the weight ratio of i-PrOH over AA was higher than 0.75, the flux of modified membrane was linearly increased with i-PrOH concentration while the retention to salt was kept unchanged. It was suggested that the transfer reaction of i-PrOH should increase grafting density and surface charge, which would be in favor of salt retention.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
2005年第20期1906-1912,共7页
Acta Chimica Sinica
基金
国家973基础研究(No.2003CB615702)
国家自然科学基金(No.20374014)资助项目.
