聚砜超滤膜制备、改性及抗油污染性能评价

Fabrication and modification of polysulfone ultrafiltration membrane and anti-oil fouling property evaluation

采用聚砜、聚乙烯吡咯烷酮和甲基吡咯烷酮为原料,通过相转化法制得聚砜超滤膜,并用二氧化钛、盐酸多巴胺、硅烷偶联剂KH550和三(羟甲基)氨基甲烷盐酸盐进行表面改性。实验考察了不同质量分数的聚砜对膜水通量的影响及改性前后膜水通量、透过系数及接触角的变化,同时配制500mg·L^(-1)的含油污水进行抗油污染测试。实验发现:聚砜超滤膜的水通量与压力成正比,且随着聚砜浓度的增加,聚砜超滤膜的纯水透过系数逐渐降低。最终选取质量分数为15%的聚砜超滤膜进行改性,改性后的膜纯水通量较改性前下降了40.66%,接触角从66.5°下降至35.3°,亲水性提高了46.91%,且抗污染性明显提高,在含油污水测试中,水通量增大了2.2倍,表现出较普通聚砜超滤膜更高的水通量和稳定性。

Abstract Polysulfone uhrailtration （UF） membrane was first fabricated by phase inversion method using polysulfone （PSF）, polyvinylpyrrolidone （PVP） and methyl pyrrolidone （NMP）. To optimize the fabrication condition, the influence of different mass fraction of polysulfone on the membrane properties （i.e., water flux and permeability） was measured which indicated that the optimal fabrication condition was 15% mass fraction for polysulfone. Then, the membrane surface was modified by using TiO2, dopamine hydrochloride, silane coupling agent KH550 and tri（hydroxymethyl） amino methane hydrochloride to enhance its anti-fouling properties. Compared with the pristine membrane, the pure water flux of modified membrane decreased by 40.66%, indicating the modified layer significantly increased the membrane resistance. However, the contact angle of the modified membrane decreased by 46.91% （from 66.5° to 35.3°）, which showed that the hydrophilic of the membrane was significantly enhanced. By filtering the oil-containing water （500 mg.L-1）, a slight decrease of water flux was observed for the modified membrane with stable water flux of 2.2 times higher modified membrane surface. than that of pristine membrane due to the hydrophilicity of the