以聚丙烯腈(PAN)为基体,N,N-二甲基乙酰胺为溶剂,正硅酸乙酯(TEOS)为无机前体,3-氨丙基三乙氧基硅烷(APTES)为添加剂,原位合成了SiO2/PAN杂化膜.借助于扫描电镜、红外光谱、接触角和渗透性能试验等测试手段,研究了APTES对SiO2/PAN杂化膜的微观形貌、化学结构、亲水性及渗透性能的影响.结果表明,原位合成法制备SiO2/PAN杂化膜的过程中,APTES使SiO2表面拥有一定量的-NH2官能团,提高了SiO2与PAN的相容性,使其在PAN基体中分散得更均匀,不但使膜具有更薄的皮层和尺寸更大的垂直指状孔结构,还进一步提高了膜表面的亲水性、水通量和抗污染性能,其中,APTES添加量为12％的(T/A12)/PAN膜的纯水接触角最小,纯水通量为260.43 L/(m2·h),且对BSA的截留率保持在99％以上.
The SiO2/PAN hybrid membranes were fabricated in situ by the method of non-solvent induced phase separation (NIPS) with polyacrylonitrile (PAN) as the matrix,N,N-dimethylacetamide (DMAc) as the solvent,tetraethoxysilane (TEOS) as the inorganic precursorand 3-aminopropyltriethoxysilane (APTES) as the additive.The effects of APTES on the micromorphology,chemical structure,hydrophilic property and filtration performance of SiO2/PAN hybrid membranes were investigated by the SEM,FTIR,contact angle measurement and ultrafiltration performance test.The results indicated that the-NH2 groups were grafted on the surface of SiO2 due to the modification of APTES,which promoted dispersion of SiO2 in the PAN matrix.Therefore,the hybrid membranes not only have a thinner surface layer and the vertical finger-like holes,but also improved the hydrophilic property and anti-fouling performance of the membranes.(T/A12)/PANwith APTES content of 12 ％ exhibited the lowest contact angle and the pure water flux of 260.43 L/(m2 · h) with the BSA rejection as high as 99％.
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