Abstract Membrane fouling problem is the bottleneck for commercial applications of separation membranes. The current study offered a first report on preparation and performance of the magnetic and photocatalytic poly (vinylidene fluoride) (PVDF)-Ni-ZnO composite membranes for the antifouling purpose. Magnetic Ni–ZnO particles (NZPs) was firstly prepared via an in-situ reduction reaction. Thereafter, the NZPs were attracted onto a PVDF membrane surface through a magnetic force effect. The PVDF-NZPs composite membrane displayed magnetic property, photocatalytic property and obviously higher antifouling performance than that of bare PVDF membrane. Particularly, the flux recovery rates (FRR) of the optimal PVDF-NZPs membrane reached to 100%, 100%, 83% and 83% for filtration of humic acid (HA), sodium alginate (SA), bovine serum albumin (BSA) and yeast solutions, respectively, which are comparable or much better than most of the literature data. In addition, it was found that acid-based (AB) interaction of the extended Derjaguin-Landau-Verwey-Overbeek (XDLVO) results played the predominant role during the fouling process. The ultrahigh FRR of the modified PVDF-NZPs membrane mainly stemmed from its in-situ and persistent photocatalytic activities. The current work not only offered a novel membrane modification method, but also presented the modified membranes with enhanced performance for water treatment.

中文翻译：

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基于磁场辅助制备性能提高的磁性和光催化膜的新策略

摘要 膜污染问题是分离膜商业化应用的瓶颈。目前的研究提供了用于防污目的的磁性和光催化聚（偏二氟乙烯）（PVDF）-Ni-ZnO复合膜的制备和性能的第一份报告。首先通过原位还原反应制备磁性 Ni-ZnO 颗粒（NZPs）。此后，NZPs 通过磁力效应被吸引到 PVDF 膜表面。PVDF-NZPs复合膜表现出磁性能、光催化性能和明显高于裸PVDF膜的防污性能。特别是对于腐植酸(HA)、海藻酸钠(SA)、最佳PVDF-NZPs膜的过滤通量回收率(FRR)分别达到100%、100%、83%和83%。分别为牛血清白蛋白 (BSA) 和酵母溶液，与大多数文献数据相当或好得多。此外，还发现扩展的 Derjaguin-Landau-Verwey-Overbeek (XDLVO) 结果的酸基 (AB) 相互作用在结垢过程中起主要作用。改性PVDF-NZPs膜的超高FRR主要源于其原位和持久的光催化活性。目前的工作不仅提供了一种新的膜改性方法，而且还展示了具有增强水处理性能的改性膜。发现扩展的 Derjaguin-Landau-Verwey-Overbeek (XDLVO) 结果的酸基 (AB) 相互作用在结垢过程中起主要作用。改性PVDF-NZPs膜的超高FRR主要源于其原位和持久的光催化活性。目前的工作不仅提供了一种新的膜改性方法，而且还展示了具有增强水处理性能的改性膜。发现扩展的 Derjaguin-Landau-Verwey-Overbeek (XDLVO) 结果的酸基 (AB) 相互作用在结垢过程中起主要作用。改性PVDF-NZPs膜的超高FRR主要源于其原位和持久的光催化活性。目前的工作不仅提供了一种新的膜改性方法，而且还展示了具有增强水处理性能的改性膜。