Jia-Feng Xu , Jia-Cheng Wu , Lu-Jiong Ruan, Wei Tian, Xi Yan, Yan Chen, Xiao-Jing Guo, Wan-Zhong Lang
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引用次数: 0
摘要
将光催化技术与膜分离技术相结合成为解决膜堵塞问题的一种开创性方法。本研究合成了Ag@SnS光催化剂,并将其与聚偏氟乙烯(PVDF)混合,通过非溶剂诱导相分离法(NIPS)制备了Ag@SnS/PVDF复合膜。结果表明,随着 Ag@SnS 的加入,Ag@SnS/PVDF 混合膜的水通量增加,这是由于膜的亲水性增强和孔隙率增加所致。最佳混合膜(MAS-2)对 BSA 和 HA 的阻隔率分别为 97.0 % 和 95.4 %,透水率为 578.5 L m-2 h-1 bar-1。此外,通过光催化再生,MAS-2 膜表面的 HA 被光降解,显示出卓越的自清洁能力,其通量恢复率(FRR)在紫外线照射后可达到 91.7%,在自然阳光照射 3 小时后可达到 95.8%。Ag@SnS 的异质结构可将光诱导电子转移到 Ag 纳米粒子上,从而帮助分离光诱导电子和空穴,增强光催化活性。经过三个循环后,FRR 仍能达到约 90.0%,显示了其出色的清洁能力。因此,Ag@SnS/PVDF 膜具有高通量性能和光催化过程自清洁能力,在水处理领域具有可预见的潜力。
Ag@SnS/PVDF membranes with self-cleaning ability driven by photocatalysis process
Coupling photocatalysis with membrane separation technology becomes one pioneering method to solve the membrane fouling. In this study, Ag@SnS photocatalyst was synthesized and blended with polyvinylidene fluoride (PVDF) to fabricate Ag@SnS/PVDF composite membranes via non-solvent induce phase separation (NIPS) method. The results show that with the addition of Ag@SnS, water flux of Ag@SnS/PVDF hybrid membranes increases due to the enhanced membrane hydrophilicity and increased porosity. The optimal hybrid membrane (MAS-2) exhibits the rejection rate of 97.0 % and 95.4 % for BSA and HA accompanied with a water permeance of 578.5 L m−2 h−1 bar−1. Moreover, MAS-2 membrane reveals excellent self-cleaning ability by photodegradation of HA on membrane surface, and its flux recovery rate (FRR) can achieve 91.7 % after UV irradiation and 95.8 % after 3 h natural sunlight irradiation via photocatalysis regeneration. The heterostructure of Ag@SnS can assist separation of photoinduced electrons and holes by transferring photoinduced electrons to Ag nanoparticles with enhanced photocatalytic activity. After three cycles, the FRR can still reach around 90.0 %, revealing its outstanding cleaning ability. Therefore, the Ag@SnS/PVDF membranes have a foreseeable potential in the field of water treatment due to its high flux performance, self-cleaning ability via photocatalysis process.
期刊介绍:
The Journal of Membrane Science is a publication that focuses on membrane systems and is aimed at academic and industrial chemists, chemical engineers, materials scientists, and membranologists. It publishes original research and reviews on various aspects of membrane transport, membrane formation/structure, fouling, module/process design, and processes/applications. The journal primarily focuses on the structure, function, and performance of non-biological membranes but also includes papers that relate to biological membranes. The Journal of Membrane Science publishes Full Text Papers, State-of-the-Art Reviews, Letters to the Editor, and Perspectives.