表面原位聚合法荷正电纳滤分离层的构建及分离性能的研究  

Construction and Separation Performance of Positively Charged Nanofiltration Separation Layers Prepared via Surface In-Situ Polymerization

作　　者：姚之侃[1] 李莹[1] 朱宝库[1] 朱利平[1] 

机构地区：[1]浙江大学高分子科学与工程学系膜与水处理技术教育部工程研究中心高分子合成与功能构造教育部重点实验室,浙江杭州310027

出　　处：《高校化学工程学报》2015年第4期789-794,共6页Journal of Chemical Engineering of Chinese Universities

基　　金：国家自然科学基金(20974094);863计划(2012AA03A602)

摘　　要：以聚氯乙烯(PVC)中空纤维超滤膜为支撑层,甲基丙烯酰氧乙基三甲基氯化铵(DMC)为荷正电单体,聚乙二醇双丙烯酸酯(PEGDA)为交联单体,通过表面原位聚合的方法,制备得到了荷正电PVC中空纤维复合纳滤膜。考察了DMC与PEGDA比例对复合纳滤膜渗透和截留性质的影响。结果表明,调控两种单体的比例可以有效地调节膜的渗透分离性能。随着DMC含量的增加,膜表面亲水性与通量增加,对小分子染料结晶紫的截留率下降,对维多利亚蓝B的截留率则始终保持在99%以上,而对氯化钠等无机盐类始终没有截留能力。当DMC与PEGDA比例为9:1时,复合纳滤膜在0.3 MPa下,纯水通量为78.6 L?m-2?h-1,对维多利亚蓝B的截留率高达99.9%,对结晶紫的截留率仅为1.9%,对氯化钠的截留率为零,表明该膜可以用于小分子有机染料的高效分离以及盐溶液中小分子有机染料的脱除。A positively charged separation layer was constructed on the outer surface ol the polyvlnyl chloride （PVC） hollow fiber ultrafiltration membrane via surface in-situ polymerization. Methacryloyloxy ethyl trimethyl ammonium chloride （DMC） and polyethylene glycol diacrylate （PEGDA） were used as the positively charged monomer and the cross-linking monomer, respectively. The densification degree and charge density of the separation layer could be adjusted by changing monomer ratio of the polymerization process. The impact of monomer ratio on permeability and separation properties was investigated. The results show that with the increase of the positively charged monomer ratio, the surface hydrophilicity and membrane flux is increased, and the rejection ratios on Crystal Violet is decreased. The rejection ratios on Victoria Blue B keeps higher than 99% but NaC1 could permeate through the membranes. When the ratio of charged and cross-linking monomer is 9：1, the water flux of the composite nanofiltration membrane at 0.3 MPa is 78.6 L·m^-2h^-1, and the rejection ratio on Victoria blue B is as high as 99.9%, with the rejection ratio on Crystal Violet of 1.9%, and the NaC1 rejection ratio is 0. These results indicate that these membranes are promising on the effective separation of small organic dyestuff molecules and removing, small organic dyestuff molecules from salt solutions.

关 键 词：聚氯乙烯中空纤维膜 表面原位聚合 荷正电 纳滤膜 

分 类 号：TQ028.8[化学工程]