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High performance ultrafiltration membrane by coupling magnetic migration and in-situ surface modification
Polymer Testing ( IF 5.1 ) Pub Date : 2021-07-29 , DOI: 10.1016/j.polymertesting.2021.107306
Zhiwei Teng 1, 2 , Bingtao Wang 2, 3 , Yingying Hu 1, 2 , Wei Zhang 2, 3 , Zhige Wu 2, 3 , Danqian Xu 1
Affiliation  

Ultrafiltration (UF) membrane technology has drawn much attraction during the past decades to address the challenge of global clean water scarcity. Herein, we proposed a facile methodology to prepare a gradient polysulfone-based (PSf) UF membrane with effective antifouling properties via coupling magnetic field-assisted directional migration and in-situ hydrolysis of fluoro-agent during non-solvent induced phase separation (NIPS). The effect of GO-Fe3O4 gradient distribution and fluorosilane (FAS) in-situ surface modification on membrane morphology, hydrophilicity, porosity, water flux and antifouling properties have been investigated. Optical microscopy and SEM-EDX observations indicated that hydrophilic GO-Fe3O4 nanofiller could directionally migrate in casting solution and eventually result in gradient distribution in PSf matrix under the magnetic field. In addition, the surface enrichment of GO-Fe3O4 provided reaction sites to anchor low energy FAS via in-situ hydrolysis on the membrane surface and realized dual antifouling mechanism (fouling-resistance and fouling-release), which guaranteed UF membranes with excellent antifouling properties and remarkable long-term stability and reusability. Our study provided a new incentive to the development of high performance UF membranes by coupling magnetic migration and in-situ surface modification.



中文翻译:

通过耦合磁迁移和原位表面改性的高性能超滤膜

在过去的几十年中,超滤 (UF) 膜技术在解决全球清洁水短缺的挑战方面吸引了很多关注。在此,我们提出了一种简便的方法,通过在非溶剂诱导相分离 (NIPS) 过程中耦合磁场辅助定向迁移和含氟剂的原位水解,制备具有有效防污性能的梯度聚砜 (PSf) UF 膜. 研究了 GO-Fe 3 O 4梯度分布和氟硅烷 (FAS) 原位表面改性对膜形态、亲水性、孔隙率、水通量和防污性能的影响。光学显微镜和 SEM-EDX 观察表明亲水性 GO-Fe 3 O 4纳米填料可以在浇铸溶液中定向迁移,最终在磁场下导致 PSf 基体中的梯度分布。此外,GO-Fe 3 O 4的表面富集提供了反应位点,通过原位水解在膜表面锚定低能FAS,实现双重防污机制(抗污和防污),保证超滤膜具有优异的防污性能和卓越的长期稳定性和可重复使用性。我们的研究通过耦合磁迁移和原位表面改性为高性能超滤膜的开发提供了新的动力。

更新日期:2021-08-01
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