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Photo-induced antifouling polyvinylidene fluoride ultrafiltration membrane driven by weak visible light
Journal of Industrial and Engineering Chemistry ( IF 6.1 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.jiec.2020.06.027
Ting Wang , Ling-li Jiang , Lu-lu Huang , Li-guang Wu , Chun-juan Li , Jing Cai

Abstract To enhance the performance of ultrafiltration membranes, a polyvinylidene fluoride (PVDF) blending membrane with photo-induced antifouling performance was fabricated. La3+- and Yb3+-doped titanium dioxide-reduced graphene oxide (TiO2-RGO) composites were initially prepared by adsorption-phase synthesis coupled with solvothermal reduction. The doped TiO2-RGO composites were then blended with the PVDF materials. The results showed that adding well-distributed, doped, and hydrophilic TiO2-RGO improved the pore structures and surface polarity of the blending membranes, thus improving their permeation and antifouling performance. After addition of doped TiO2-RGO with photocatalytic activity, the antifouling performance of the resulting blending membranes increased under weak visible-light irradiation. The agglomerated doped TiO2-RGO in the polymeric matrix reduced the hydrophilicity and porosity of the resulting membranes, thereby decreasing their water permeability and antifouling performance. Solvothermal reduction through ethylene glycol also improved the photocatalytic activity of Yb-doped TiO2-RGO and enhanced the affinity between doped TiO2-RGO and PVDF. These two effects simultaneously increased the water permeability and photo-induced antifouling performance of the blending membranes. The flux recovery rate of the blending membranes containing Yb-doped TiO2-RGO treated by ethylene glycol exceeded 69% after illumination. In particular, the flux recovery rate of membranes reached about 96% after illumination coupling with washing.

中文翻译:

弱可见光驱动的光致防污聚偏氟乙烯超滤膜

摘要 为了提高超滤膜的性能,制备了一种具有光致防污性能的聚偏二氟乙烯(PVDF)共混膜。La3+- 和 Yb3+ 掺杂的二氧化钛还原氧化石墨烯 (TiO2-RGO) 复合材料最初是通过吸附相合成结合溶剂热还原制备的。然后将掺杂的 TiO2-RGO 复合材料与 PVDF 材料混合。结果表明,添加均匀、掺杂和亲水性的 TiO2-RGO 改善了共混膜的孔结构和表面极性,从而提高了其渗透和防污性能。添加具有光催化活性的掺杂TiO2-RGO后,所得共混膜在弱可见光照射下的防污性能提高。聚合物基质中团聚的掺杂 TiO2-RGO 降低了所得膜的亲水性和孔隙率,从而降低了它们的透水性和防污性能。通过乙二醇的溶剂热还原还提高了 Yb 掺杂的 TiO2-RGO 的光催化活性,并增强了掺杂的 TiO2-RGO 和 PVDF 之间的亲和力。这两种效应同时增加了共混膜的透水性和光致防污性能。乙二醇处理的掺镱TiO2-RGO共混膜在光照后通量恢复率超过69%。特别是光照结合洗涤后膜的通量回收率达到96%左右。从而降低其透水性和防污性能。通过乙二醇的溶剂热还原还提高了 Yb 掺杂的 TiO2-RGO 的光催化活性,并增强了掺杂的 TiO2-RGO 和 PVDF 之间的亲和力。这两种效应同时增加了共混膜的透水性和光致防污性能。乙二醇处理的掺镱TiO2-RGO共混膜在光照后通量恢复率超过69%。特别是光照结合洗涤后膜的通量回收率达到96%左右。从而降低其透水性和防污性能。通过乙二醇的溶剂热还原还提高了 Yb 掺杂的 TiO2-RGO 的光催化活性,并增强了掺杂的 TiO2-RGO 和 PVDF 之间的亲和力。这两种效应同时增加了共混膜的透水性和光致防污性能。乙二醇处理的掺镱TiO2-RGO共混膜在光照后通量恢复率超过69%。特别是光照结合洗涤后膜的通量回收率达到96%左右。这两种效应同时增加了共混膜的透水性和光致防污性能。乙二醇处理的掺镱TiO2-RGO共混膜在光照后通量恢复率超过69%。特别是光照结合洗涤后膜的通量回收率达到96%左右。这两种效应同时增加了共混膜的透水性和光致防污性能。乙二醇处理的掺镱TiO2-RGO共混膜在光照后通量恢复率超过69%。特别是光照结合洗涤后膜的通量回收率达到96%左右。
更新日期:2020-09-01
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