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.
出处
《高校化学工程学报》
EI
CAS
CSCD
北大核心
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)
关键词
聚氯乙烯中空纤维膜
表面原位聚合
荷正电
纳滤膜
polyvinyl chloride hollow fiber membrane
surface in-situ polymerization
positively charge
nanofiltration membrane
