Combining photocatalysts are frequently used to address the issue of poly(vinylidene fluoride) (PVDF) membranes being susceptible to contamination. The main constraints of existing photocatalyst-modified films are the narrow light utilization range and the generally limited enhancement of hydrophilicity and flux of the films modified by a single photocatalyst. Herein, a novel visible light photocatalyst Ag₆Si₂O₇–TiO₂ with a core–shell nanostructure and a large specific surface area was prepared by in situ deposition. The casting solution was supplemented with Ag₆Si₂O₇–TiO₂ and 1.35 g PVDF-g-poly (ethylene glycol) methyl ether methacrylate (PEGMA) prepared by ATRP and then a film through non-solvent-induced phase transformation was prepared. M1 with 0.25 g Ag₆Si₂O₇–TiO₂ has ideal overall performance in filtration of pure water and 20 mg/L SA solution. Its pure water flux, recovery flux, and rejection were found to be 1471 and 1091 L/(m² h), and 88.1%, respectively. Additionally, M1 has the best-increased flux by 20.3% greater under visible light (VIS) irradiation than under shading condition. To measure changes in flux and rejection under three conditions (shading, UV light, and VIS light), M1 was chosen as the representative membrane. There is no significant difference in filtering performance between UV and VIS, nevertheless, both are much better than no light. The photocatalytic degradation impact of M1 on ceftiofur sodium was next examined under UV and VIS circumstances, and the degradation effect of M1 under the two conditions was good and comparable, approximately 70% and 65%, respectively. It indicates that the modified membranes have excellent VIS responsiveness, flux, and anti-pollution performance.

Graphical Abstract

中文翻译：

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核壳纳米结构可见光催化剂Ag6Si2O7-TiO2对聚偏氟乙烯-g-聚乙二醇甲醚甲基丙烯酸酯/聚偏氟乙烯高通量超滤膜性能的影响

组合光催化剂经常用于解决聚偏氟乙烯 (PVDF) 膜易受污染的问题。现有光催化剂改性薄膜的主要制约因素是光利用范围窄以及单一光催化剂改性薄膜的亲水性和通量的提高普遍有限。本文通过原位沉积制备了一种具有核壳纳米结构和大比表面积的新型可见光光催化剂Ag ₆ Si ₂ O ₇ –TiO _{2 。}在铸膜溶液中添加Ag ₆ Si ₂ O ₇ –TiO ₂和ATRP制备的1.35 g PVDF - g-聚乙二醇甲醚甲基丙烯酸酯(PEGMA)，然后通过非溶剂诱导相变制备薄膜。 。含有0.25 g Ag ₆ Si ₂ O ₇ –TiO ₂的M1在过滤纯水和20 mg/L SA溶液时具有理想的综合性能。其纯水通量、回收通量和截留率分别为 1471 和 1091 L/(m ² h) 和 88.1%。此外，M1在可见光（VIS）照射下的光通量比在遮光条件下增加了20.3%，效果最佳。为了测量三种条件（遮光、紫外光和可见光）下通量和截留率的变化，选择 M1 作为代表性膜。紫外线和可见光之间的过滤性能没有显着差异，但两者都比没有光好得多。接下来考察了M1在UV和VIS条件下对头孢噻呋钠的光催化降解效果，两种条件下M1的降解效果良好且具有可比性，分别约为70%和65%。这表明改性膜具有优异的VIS响应性、通量和抗污染性能。

图形概要