Abstract
Nanosized cuprous oxide (Cu2O) was used to modify the surface of γ-Bi2MoO6, resulting in highly efficient visible-light-responsive Cu2O/γ-Bi2MoO6 composite photocatalysts. The obtained photocatalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), selected area electron diffraction (SAED), X-ray photoelectron spectroscopy (XPS), and UV-Vis diffuse reflectance spectrum (UV-Vis-DRS) to determine their phase structures, micromorphologies, and light absorption properties. The important role of surface-modified Cu2O in improving the photocatalytic activity of γ-Bi2MoO6 under visible light irradiation was studied using the degradation of methylene blue (MB). The results showed that Cu2O nanoparticles with average size of ~10 nm modified the surface of the γ-Bi2MoO6. The nanoparticles delivered both an obvious red-shift of absorption threshold and intensity of the γ-Bi2MoO6, as well as enhanced separation efficiency of photogenerated carriers, thereby leading to significant enhancement in photocatalytic activity. When the amount of Cu2O was 1.5%, [Article] doi: 10.3866/PKU.WHXB201301151 www.whxb.pku.edu.cn 物理化学学报(Wuli Huaxue Xuebao) Acta Phys. -Chim. Sin. 2013, 29 (4), 813-820 April Received: October 31, 2012; Revised: January 14, 2013; Published on Web: January 15, 2013. ∗Corresponding authors. HAN Yu-Qi, Email: hanyq@hxu.edu.cn; Tel: +86-936-8282067. WANG Fang, Email: wangfang987@126.com; Tel: +86-936-8282066. The project was supported by the National Natural Science Foundation of China (51263008), Principal Fund of Hexi University, China (XZ2010), University Science and Technology Innovation Project of Hexi University, China, and General Projects of Key Laboratory of Hexi Corridor Resources Utilization of Gansu Universities, China (XZ1012). 国家自然科学基金(51263008),河西学院校长基金(XZ2010),河西学院大学生科技创新项目和甘肃省高校河西走廊特色资源利用省级重点实 验室面上项目(XZ1012)资助 C Editorial office of Acta Physico-Chimica Sinica 813 Vol.29 Acta Phys. -Chim. Sin. 2013 the photocatalytic activity of the Cu2O/γ-Bi2MoO6 composite photocatalyst was 6.4 times higher than that of pristine γ-Bi2MoO6.
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