涂覆法制备高性能磺化聚醚砜混合基质膜

发布时间：2018-04-26 09:29

本文选题：磺化聚醚砜 + 纳米粒子　；参考：《化工学报》2017年04期

【摘要】：采用涂覆法将磺化聚醚砜(SPES)浓度为0.7%(质量)的铸膜液制备成膜,并使用钛酸四丁酯(TBT)和TiO_2纳米颗粒作为添加剂来对比改善膜性能。通过对纳滤膜的微观结构表征,以及膜对NaCl与染料的分离性能等方面来分析其性能。当钛酸四丁酯的含量为0.35%(质量)时,膜的通量从27.3 L·m~(-2)·h~(-1)提升至38.9 L·m~(-2)·h~(-1),而截留率则有91.2%降至82.5%。与纯SPES膜相比,改性纳滤膜的平均孔径更大,由1.51 nm增大为2.28 nm。TBT改性膜表面有TiO_2纳米颗粒形成,而且随着TBT的浓度增大,颗粒逐渐增大,而直接添加TiO_2纳米颗粒的纳滤膜的表面呈现明显的团聚现象。使用钛酸四丁酯代替TiO_2纳米颗粒作为添加剂,在增加膜通量的同时也能降低纳米颗粒团聚而导致的膜缺陷。由钛酸四丁酯水解生成的正丁醇的致孔作用对膜的性能具有很大的影响。
[Abstract]:The casting solution with the concentration of 0.7% (mass) of sulfonated polyethersulfone (SPESs) was used to prepare the film, and tetrabutyl titanate (TBT) and TiO_2 nanoparticles were used as additives to improve the properties of the film. The microstructure of nanofiltration membrane and the separation of NaCl from dyes were analyzed. When the content of tetrabutyl titanate was 0.35% (mass), the flux of the membrane increased from 27.3 L / m ~ (-2) h ~ (-1) to 38.9 L ~ (-1) L ~ (-1) 路h ~ (-1), while the rejection rate decreased from 91.2% to 82.5%. Compared with the pure SPES membrane, the average pore size of the modified nanofiltration membrane was larger, from 1.51 nm to 2.28 nm.TBT, and the TiO_2 nanoparticles were formed on the surface of the modified membrane, and with the increase of the concentration of TBT, the particle size increased gradually. The surface of nanofiltration membrane directly added TiO_2 nanoparticles showed obvious agglomeration. Using tetrabutyl titanate instead of TiO_2 nanoparticles as additive can increase the membrane flux and reduce the membrane defects caused by nano-particles agglomeration. The pore effect of n-butanol hydrolyzed by tetrabutyl titanate has great influence on the properties of the film.
【作者单位】：浙江工业大学膜水处理中心;
【基金】：海岛水资源保障技术集成与示范项目(2016YFC0401508)~~
【分类号】：TQ051.893

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