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A double anti-fouling mechanism established by self-assembly of TiO2 on F127 chains for improving the hydrophilicity of PES membrane based on RTIPS method
Separation and Purification Technology ( IF 8.6 ) Pub Date : 2020-09-19 , DOI: 10.1016/j.seppur.2020.117742
Chun-Mei Gao , Jin-Chao Chen , Sheng-Hui Liu , Hang Yang , Shi-Feng Ji , Hong-Yu Chen

Novel polyethersulfone (PES) membranes with porous top surface and sponge-like structure based on reverse thermally induced phase separation (RTIPS) method modified by titania sol (TiO2 sol) and triblock copolymer (F127) were developed. The highlight of this work was that the self-assembly of TiO2 on F127 was obtained during the RTIPS membrane formation process. Properties of PES/TiO2/F127 membranes, which varied with TiO2 sol, F127 and coagulation water bath temperature, were investigated by cloud point, SEM, EDX, AFM, TGA, XPS, FRR, contact angle and so on. SEM morphologies revealed that homogeneous porous top surface as well as sponge-like structure appeared in the membrane prepared by RTIPS process, while dense skin surface and finger-like cross-section obtained from the membranes by NIPS method. As a result, the pure water flux, rm and porosity of the membranes by RTIPS method were higher than that by NIPS method. EDX results indicated that the agglomeration of titanium dioxide was avoided by sol gel process. The XPS data revealed that the self assembly of TiO2 on PEO segments in F127 alleviated the leakage of TiO2 from the modified membrane and then improved the hydrophilic stability of the membrane. The water contact angle illustrated that the addition of TiO2 and F127 improved the hydrophilicity of the membrane. Furthermore, the pure water flux recovery ratio of the modified membranes were higher (>79%) than that of pure PES membrane (61%). In a word, the permeability and anti-pollution performance of the PES/TiO2/F127 membrane could be improved by the addition of TiO2 sol and F127, moreover, RTIPS method was a superior method for membrane preparation.



中文翻译:

基于RTIPS方法的F127链上TiO 2自组装建立的双重防污机理,用于提高PES膜的亲水性

基于二氧化钛溶胶(TiO 2 sol)和三嵌段共聚物(F127)改性的逆热诱导相分离(RTIPS)方法,开发了具有多孔顶表面和海绵状结构的新型聚醚砜(PES)膜。这项工作的重点是在RTIPS膜形成过程中获得了F127上TiO 2的自组装。PES / TiO 2 / F127膜的性能随TiO 2的变化而变化通过浊点,SEM,EDX,AFM,TGA,XPS,FRR,接触角等研究了溶胶,F127和混凝水浴温度。扫描电镜(SEM)的形貌表明,采用RTIPS工艺制备的膜具有均匀的多孔顶表面和海绵状结构,而采用NIPS法制备的膜具有致密的皮肤表面和手指状截面。结果,RTIPS方法的膜的纯水通量,r m和孔隙率高于NIPS方法的。EDX结果表明,通过溶胶凝胶法避免了二氧​​化钛的团聚。XPS数据表明TiO 2在F127的PEO段上的自组装减轻了TiO 2的泄漏从改性的膜中分离出来,然后改善了膜的亲水稳定性。水接触角表明,TiO 2和F127的添加改善了膜的亲水性。此外,改性膜的纯水通量回收率高于纯PES膜(61%)(> 79%)。简而言之,通过加入TiO 2溶胶和F127可以提高PES / TiO 2 / F127膜的渗透性和抗污染性能,而且RTIPS法是一种较好的膜制备方法。

更新日期:2020-09-22
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