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聚砜膜的表面亲水改性

作者：徐天玉，李希鹏，张伟，李保安

单位： 1. 天津大学化工学院化学工程研究所，天津 300350；2. 天津市膜科学与海水淡化重点实验室，天津 300350；3. 化学工程联合国家重点实验室天津大学，天津 300350；4. 天津化学化工协同创新中心，天津 300350

关键词：亲水；膜改性；聚砜膜；多巴胺；纳米球状结构

DOI号：

分类号： O631

出版年,卷(期):页码： 2020,40(4):41-48

摘要：

本文配置叔丁基过氧化氢（TBHP）-多巴胺（DA）-三羟甲基氨基甲烷（Tris）缓冲液，通过在聚砜膜（PSF）表面沉积聚多巴胺（PDA）来制备亲水纳滤膜。研究了TBHP不同添加量以及不同pH值时改性膜的亲水性能，并利用FTIR、XPS、水油接触角测量仪、SEM、AFM等方法表征改性前后PSF膜表面的元素组成、结构、形貌、亲水性能、稳定性能以及渗透性能。结果表明，PH=8.5，TBHP的添加量为800μL时，PSF膜的水接触角由52°降到13°，油接触角由142°升到165°，得到了亲水疏油改性膜，纯水通量为91.3L/m2· h，相比PSF基膜提高了170.4%，截留率达90.7%，超声震荡后，水接触角仅下降3.1°，表现了良好的稳定性能。

The hydrophilic nanofiltration membrane was successfully prepared by deposing the polydopamine(PDA) group on the surface of the polysulfone(PSF) membrane in tert-butyl hydrogen peroxide(TBHP)-dopamine(DA)-Trisbuffer solution. The wettability of modified membrane with different TBHP content and pH value was investigated, and the elemental composition, structure, morphology, wettability and stability of modified membrane surface of PSF was characterized by FTIR, XPS, water-oil contact angle measuring instrument, SEM, AFM, etc. The results manifested that, when pH=8.5 and the addition of TBHP was 800μL, the water contact angle of the modified PSF decreased from 52°to 13°,the oil contact angle increased from 142°to 165°thereby producing hydrophilicity membrane. What’s more, the pure water flux was increasing by 170.4%, going up to 91.3L/m2· h, and the rejection reached 90.7%. After ultrasonic shock, the water contact angle only decreased by 3.1° , showing good stability.

基金项目：

国家自然科学基金“膜蒸馏海水脱盐过程中的膜污染机理研究”（21878218）；天津市科技重大专项与工程“基于可持续消除水体黑臭的技术集成与示范研究”（18ZXSZSF00030）

作者简介：

第一作者简介：徐天玉（1994），女，辽宁省，无，硕士，硕士，疏水膜表面的亲水改性，E-mail：834176360@qq.com 通讯作者，E-mail：libaoan@tju.edu.cn

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