Surface Segregation-Induced Superwetting Separation Membranes with Hierarchical Surface Structures and Internalized Gel Networks,Advanced Functional Materials

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Surface Segregation-Induced Superwetting Separation Membranes with Hierarchical Surface Structures and Internalized Gel Networks
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2022-08-31 , DOI: 10.1002/adfm.202204612
Zhongxiang Bai ₁ , Kun Jia _{1,

2,

3} , Shuai Zhang _{1,

2} , Guo Lin ₁ , Yumin Huang _{1,

2} , Xiaobo Liu _{1,

2}

Affiliation

The porous polymeric membranes prepared by conventional nonsolvent-induced phase separation (NIPS) suffer from notorious fouling pollution during oil/water separation. Herein, an improved one-step NIPS strategy is proposed to fabricate anti-fouling polyethersulfone (PES) based membranes that bear hierarchically spherical structures on the interface and an internalized gel network. More specifically, the hydrogen bonding between hydrophilic additives of polyvinylpyrrolidone (PVP) and tannic acid (TA), as well as Fe³⁺-TA coordination interaction are orchestrated to modulate their surface segregation behaviors during NIPS, leading to in situ generation of the interfacial assembled nanospheres and embedded gel networks in the PES matrix. Thanks to the synergistic effect of these dual antifouling barriers, the optimized membrane exhibits super-hydrophilic/underwater super-oleophobic properties, and displays high efficiency as well as good recyclability in separating surfactant stabilized oil-in-water emulsions. In addition, this improved NIPS methodology allows dip coating of various porous substrates to separate diverse oil/water mixtures, which also exhibits good anti-fouling ability. Basically, this study will provide new insights for design of anti-pollution oil/water separation materials by the phase inversion method.

中文翻译：

具有分层表面结构和内化凝胶网络的表面偏析诱导超润湿分离膜

通过传统的非溶剂诱导相分离（NIPS）制备的多孔聚合物膜在油/水分离过程中受到臭名昭著的污染污染。在此，提出了一种改进的一步式 NIPS 策略来制造基于聚醚砜 (PES) 的防污膜，该膜在界面上具有分级球形结构和内化凝胶网络。更具体地说，聚乙烯吡咯烷酮（PVP）和单宁酸（TA）的亲水添加剂之间的氢键，以及Fe ³⁺-TA 配位相互作用可在 NIPS 期间调节其表面分离行为，从而在 PES 基质中原位生成界面组装的纳米球和嵌入的凝胶网络。由于这些双重防污屏障的协同作用，优化后的膜表现出超亲水/水下超疏油性能，并在分离表面活性剂稳定的水包油乳液方面表现出高效率和良好的可回收性。此外，这种改进的 NIPS 方法允许对各种多孔基材进行浸涂以分离不同的油/水混合物，这也表现出良好的防污能力。基本上，这项研究将为通过相转化法设计抗污染油水分离材料提供新的见解。

更新日期：2022-08-31

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