State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China; Innovation Center for Textile Science and Technology, Donghua University, Shanghai 200051, China.
Innovation Center for Textile Science and Technology, Donghua University, Shanghai 200051, China.
J Colloid Interface Sci. 2019 Nov 1;555:636-646. doi: 10.1016/j.jcis.2019.08.017. Epub 2019 Aug 6.
Constructing a flexible inorganic membrane photocatalyst for efficient visible-light-driven water disinfection is highly desired but remains a great challenge. Herein, we fabricated a flexible and heterostructured silver/bismuth oxyiodide/titania (Ag/BiOI/TiO) nanofibrous membrane by combining the electrospinning technique with simple successive ionic layer adsorption and reaction (SILAR) and photodeposition process. In this ternary nanocomposite, ultrathin BiOI nanoplates were firmly anchored onto TiO nanofibers, while Ag nanoparticles were uniformly decorated on the surface of both BiOI and TiO. Benefiting from the large surface area, improved visible-light absorption, and the effective interfacial charge transfer induced by multi-heterojunctions, the resultant Ag/BiOI/TiO membrane exhibited superior photocatalytic disinfection activity (7.5 log inactivation of E. coli within 1 h) under visible light illumination. Moreover, the plasmonic Z-scheme charge transfer mode was also proposed for Ag/BiOI/TiO system according to the band structure and reactive species analysis. More significantly, the Ag/BiOI/TiO membrane-based photoreactor could be facilely constructed for high-efficiency disinfection of high volume contaminated water, and the membrane still maintained good structural integrity and mechanical flexibility after utilization. This work may open up new avenues for designing and constructing flexible high-performance photocatalytic membranes for environmental applications.
构建用于高效可见光驱动水消毒的灵活无机膜光催化剂是人们所期望的，但仍然是一个巨大的挑战。在此，我们通过将静电纺丝技术与简单的连续离子层吸附和反应（SILAR）以及光电沉积工艺相结合，制备了一种灵活的异质结构银/碘化氧铋/二氧化钛（Ag/BiOI/TiO）纳米纤维膜。在这种三元纳米复合材料中，超薄的 BiOI 纳米板牢固地锚定在 TiO 纳米纤维上，而 Ag 纳米颗粒均匀地装饰在 BiOI 和 TiO 的表面上。得益于大的比表面积、增强的可见光吸收以及多异质结引起的有效界面电荷转移，所得的 Ag/BiOI/TiO 膜在可见光照射下表现出优异的光催化消毒活性（在 1 小时内大肠杆菌的灭活率为 7.5 log）。此外，还根据能带结构和反应性物种分析提出了 Ag/BiOI/TiO 体系的等离子体 Z 型电荷转移模式。更重要的是，基于 Ag/BiOI/TiO 膜的光反应器可以方便地构建用于高效消毒高体积污染水，并且在使用后膜仍然保持良好的结构完整性和机械柔韧性。这项工作可能为设计和构建用于环境应用的灵活高性能光催化膜开辟新途径。
