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采用聚间苯二甲酰间苯二胺(PMIA)与羟基化多壁碳纳米管(O-MWCNTs)共混,通过干-湿相转化法制备中空纤维纳滤膜,研究了不同含量的羟基化多壁碳纳米管对O-MWCNTs/PMIA中空纤维纳滤膜结构与性能的影响。结果表明随着O-MWCNTs的含量的增加,膜内部指状孔明显增加,海绵状过渡层减少;O-MWCNTs/PMIA中空纤维纳滤膜的亲水性与表面电负性明显加强;共混纳滤膜的水通量随O-MWCNTs的增加而增加,对无机盐的截留出现先增加后减小的趋势。在渗透压力为1.0 MPa下,O-MWCNTs含量为0.1%时,O-MWCNTs/PMIA中空纤维纳滤膜的纯水通量为55.1 L/(m~2·h),对硫酸钠的截留率可达到78.5%,对甲基橙、亚甲基蓝、酸性红、直接红13的去除率可达到90.5%、94.4%、99.5%、99.9%。
The hollow fiber nanofiltration membrane was prepared by dry-wet phase inversion method by blending poly (m-phenylene isophthalamide) (PMIA) with hydroxylated multi-wall carbon nanotubes (O-MWCNTs) Effect of MWNTs on the Structure and Properties of O-MWCNTs / PMIA Hollow Filtration Nanofiltration Membranes. The results showed that with the increase of the content of O-MWCNTs, the number of finger-like pores in the membrane increased significantly and the spongy transition layer decreased. The hydrophilicity and surface electronegativity of O-MWCNTs / PMIA hollow fiber nanofiltration membrane were significantly enhanced. The nanofiltration membrane water flux increased with the increase of O-MWCNTs, the retention of inorganic salts first increased and then decreased. The pure water flux of O-MWCNTs / PMIA hollow fiber nanofiltration membrane was 55.1 L / (m ~ 2 · h) at the osmotic pressure of 1.0 MPa and the content of O-MWCNTs was 0.1% Up to 78.5%. The removal rates of methyl orange, methylene blue, acid red and direct red 13 can reach 90.5%, 94.4%, 99.5% and 99.9%.