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以聚间苯二甲酰间苯二胺(PMIA)为主体膜材料,有机改性蒙脱土(OMMT)为添加剂,采用L-S相转化法制备了新型PMIA-OMMT纳米复合膜,并对水体中持久性有机污染物全氟辛烷磺酸(PFOS)进行了去除研究。结果表明,对膜的表征发现,加入OMMT之后,PMIA-OMMT复合膜的断面出现了明显的指状孔,且膜的疏水性和表面电负性增强。当OMMT添加质量分数为2%时,膜对PFOS的去除率最高(92.85%,0.4 MPa);而且随着溶液中p H升高,去除率升高;当PFOS与As(V)共存时,会降低膜对PFOS的去除率,而与Pb2~+共存时,膜对PFOS去除率可升高到99.02%(1.0 MPa,Pb2~+的质量浓度500μg/L),但是膜污染严重,膜通量降低。
A new type of PMIA-OMMT nanocomposite film was prepared by poly (l-phenylene isophthalamide) (PMIA) as main film material and organic modified montmorillonite (OMMT) as additive. Perfluorooctane sulfonate (PFOS), a persistent organic pollutant, was removed. The results showed that the morphology of the membrane was found that OMMT, PMIA-OMMT composite membrane cross-section appeared obvious finger-like pores, and membrane hydrophobicity and surface electronegativity increased. The removal rate of PFOS was the highest when the mass fraction of OMMT was 2% (92.85%, 0.4 MPa), and the removal rate increased with the increase of p H in solution. When PFOS and As (V) coexisted, The membrane removal rate of PFOS could be reduced, while the removal rate of PFOS increased to 99.02% (1.0 MPa, Pb2 + concentration of 500μg / L) when Pb2 + coexist, but membrane fouling is serious, Reduce the amount.