论文名称：Photoinduced formation of reactive oxygen species and electrons from metal oxide-silica nanocomposite: An EPR spin-trapping study
论文类型：期刊论文
发表刊物：APPLIED SURFACE SCIENCE
收录刊物：SCIE、EI、Scopus
卷号：416
页面范围：281-287
ISSN号：0169-4332
关键字：Metal oxide nanocomposites; Active species; Photoinduced formation; Photocatalytic activity; Bisphenol A
摘要：Metal oxide nanocomposites with photocatalytic activity have the potential for many applications in environmental remediation and biomedicine. In this study, we investigated the formation and stabilization of electrons/holes from three metal oxide-silica nanocomposites (CuO-SiO2, Fe2O3-SiO2 and ZnO-SiO2) under irradiation by electron paramagnetic resonance (EPR) technology. The characteristic EPR signals with g = 2.00070-2.00105, Delta Hp-p = 2.17-2.37 G were determined, which corresponded to lattice-trapped electrons. Moreover, the generation of active species from CuO-SiO2, Fe2O3-SiO2 and ZnO-SiO2 in aqueous solution under irradiation was also systematically studied. The results showed that all the three nanocomposites could generate hydroxyl radical, singlet oxygen and electron. CuO-SiO2 was more effective than Fe2O3-SiO2 and ZnO-SiO2 in producing hydroxyl radical and electrons, while ZnO-SiO2 was the most efficient in generating singlet oxygen. In addition, CuO-SiO2 exhibited most obviously photocatalytic activity toward degradation of bisphenol A, followed by Fe2O3-SiO2 and ZnO-SiO2. These findings will provide vital insights into photocatalytic mechanisms and potentially photoinduced toxicity of metal oxide-silica nanocomposites. (C) 2017 Elsevier B.V. All rights reserved.
发表时间：2017-09-15