Enhanced Ethylene Photodegradation Performance of CoO/Bi2WO6 Composites with Direct Z-Scheme Configuration

Abstract

利用太阳光高效光催化降解空气中的微量乙烯依然是一个很大的挑战。本文在前期研究的基础上，根据半导体光催化降解乙烯的基本原理，选择两种窄带隙的半导体CoO、Bi2WO6来构建CoO-Bi2WO6的Z型结构并研究其光催化性能。利用两部步水热法成功制备了一系列超薄的Bi2WO6负载的CoO复合材料，并采用XRD、SEM、UV-Visible DRS对其结构、形貌和吸光特性进行了表征，然后系统研究了其在模拟太阳光下光催化降解乙烯的性能，4-COBWO样品的性能最佳，在90 min内可以完全光催化降解100 ppm的乙烯，同时具有良好的稳定性。该研究为实现高效光催化净化空气材料的设计与环境污染治理提供了理论研究基础与借鉴。 Photocatalytic oxidation of ethylene under sunshine continues to be a challenge at the frontier of chemistry. Based on the previous research and the basic principle of semiconductor photocatalytic degradation of ethylene, in this study, CoO-Bi2WO6 composite semiconductors with Z-scheme configuration were fabricated by two-step hydrothermal method. The structure, morphology and absorptivity of the samples were characterized by XRD, UV-Visible diffusive-reflectance spectra (DRS), SEM. Their performances on photocatalytic degradation of ethylene under simulated sunlight illumination were investigated. The highest activity for C2H4 photo degradation was obtained on 4-COBWO. C2H4 was completely decomposed within only 90 min. Moreover, stable C2H4 photo-oxidationactivity could be obtained. From the point of view of the material design perspective and the application in the field of environmental pollutant remediation, the present research will provide potential value for further study on the removal of C2H4.