Dai Fengna, Zhang Shangying, Wang Qi, Chen Haiquan, Chen Chunhai, Qian Guangtao, Yu Youhai
Center for Advanced Low-Dimension Materials, State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Material Science and Engineering, Donghua University, Shanghai, China.
Front Chem. 2021 Oct 19;9:753741. doi: 10.3389/fchem.2021.753741. eCollection 2021.
Nanosized titanium oxide (TiO)-based photocatalysts have exhibited great potential for the degradation of organic contaminants, while their weak absorption of visible light limits the photocatalytic efficiency. Herein, a novel reduced graphene oxide/TiO-polyphenylenesulfone (rGO/TiO-PPSU) hybrid ultrafiltration membrane has been successfully prepared via a non-solvent induced phase-separation method, in which the synergistic coupling between the rGO and TiO could endowed the fabricated membranes with visible-light-driven efficient photocatalytically degradation of organic pollutants and outstanding photocatalytic and antifouling properties. Compared with the PPSU membranes prepared with Graphene oxide and TiO, respectively, the rGO/TiO-PPSU membrane demonstrated significant photodegradation towards phenazopyridine hydrochloride (PhP) solution under ultraviolet light (improved about 71 and 43%) and visible light (improved about 153 and 103%). The permeability and flux recovery rates of the membrane indicated that the high flux of the rGO/TiO-PPSU membrane can be greatly restored after fouling, due to the improved self-cleaning properties under visible light static irradiation. With the properties of high performance of photocatalytic degradation and good self-cleaning ability, the rGO/TiO-PPSU membrane would have great potential in water treatment.
纳米二氧化钛（TiO）基光催化剂在有机污染物降解方面展现出巨大潜力，但其对可见光的弱吸收限制了光催化效率。在此，通过非溶剂诱导相分离法成功制备了一种新型的还原氧化石墨烯/二氧化钛-聚苯砜（rGO/TiO-PPSU）混合超滤膜，其中rGO与TiO之间的协同耦合可使制备的膜具有可见光驱动的高效光催化降解有机污染物以及出色的光催化和抗污染性能。与分别用氧化石墨烯和TiO制备的PPSU膜相比，rGO/TiO-PPSU膜在紫外光下对盐酸非那吡啶（PhP）溶液表现出显著的光降解性能（分别提高约71%和43%），在可见光下也有显著提升（分别提高约153%和103%）。膜的渗透率和通量恢复率表明，由于在可见光静态照射下自清洁性能的改善，rGO/TiO-PPSU膜的高通量在污染后能够得到极大恢复。凭借高性能的光催化降解和良好的自清洁能力，rGO/TiO-PPSU膜在水处理方面具有巨大潜力。
