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Titania nanowires coated PEI/P25 membranes for photocatalytic and ultrafiltration applications†
New Journal of Chemistry ( IF 3.3 ) Pub Date : 2018-01-15 00:00:00 , DOI: 10.1039/c7nj04628f
Rui Jiang 1, 2, 3, 4 , Wei Wen 1, 2, 3, 4, 5 , Jin-Ming Wu 1, 2, 3, 4
Affiliation  

Polymeric membranes incorporated with TiO2 possess advantages in superhydrophilicity, anti-fouling, anti-microbial and pollutant degradation. Herein, we report a new synthetic route to fabricate TiO2 composited polymeric membranes for photocatalytic and ultrafiltration applications. A flexible hybrid membrane of polyetherimide (PEI) and commercial P25 TiO2 nanoparticles was firstly synthesized, which was then surface functionalized by quasi-aligned TiO2 nanowires adhering tightly to the membrane. The synthetic route involves multi-steps of surface roughening, titanate nanowire deposition and finally hot water treatment. The mercury porosimetry measurement shows that the membrane contains mesopores ranging from 2 to 100 nm with a peak maximum at 26 nm, and the porosity is ca. 48.7%. The TiO2 functionalized PEI/P25 membranes exhibited high and stable efficiency to enable photodegradation of rhodamine B in water under UV light illumination. They also possessed high hydrophilicity, permeability and resistance to fouling with bovine serum albumin (BSA) solution. The ultrafiltration tests show that the surface roughened PEI/P25 membrane exhibited a pure water flux of 2165 L m−2 h−1, with a BSA retention rate of only 3.2%. After precipitation with TiO2 nanowires, the BSA retention rate increased to 93.3% while a high water flux of 595 L m−2 h−1 was still attained. Further UV light illumination of the membrane achieved an increased water flux recovery ratio (FRR) of 88%, which suggests an enhanced antifouling performance when compared with the water rinsed one.

中文翻译:

用于光催化和超滤应用的Titania纳米线涂覆的PEI / P25膜

掺有TiO 2的聚合物膜在超亲水性,防污,抗微生物和污染物降解方面具有优势。在这里,我们报告了一条新的合成路线,以制造用于光催化和超滤应用的TiO 2复合聚合物膜。首先合成了聚醚酰亚胺(PEI)和商用P25 TiO 2纳米颗粒的柔性杂化膜,然后通过准取向的TiO 2将其表面官能化。纳米线紧紧地附着在膜上。合成路线包括表面粗糙化,钛酸盐纳米线沉积以及最终热水处理的多个步骤。汞孔隙率法测量表明,该膜包含2至100 nm的中孔,其最大峰值在26 nm处,并且孔隙率为ca。48.7%。TiO 2功能化的PEI / P25膜表现出高且稳定的效率,能够在紫外光照射下使若丹明B在水中光降解。它们还具有很高的亲水性,渗透性和对牛血清白蛋白(BSA)溶液的抗结垢性。超滤测试表明,经表面粗糙处理的PEI / P25膜的纯水通量为2165 L m -2 h -1,其BSA保留率仅为3.2%。用TiO 2纳米线沉淀后,BSA保留率提高到93.3%,同时仍获得595 L m -2 h -1的高水通量。膜的进一步紫外线照射实现了88%的增加的水通量回收率(FRR),这表明与冲洗过的水相比,防污性能增强了。
更新日期:2018-01-15
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