title: Enhanced visible light photocatalysis over Pt-loaded Bi2O3: an insight into its photogenerated charge separation, transfer and capture.
abstract: In this study, we have fabricated crystalline metallic Pt nanoparticles-loaded α-Bi2O3microrods (Pt/Bi2O3) using a precipitation method, followed by an impregnation-reduction deposition route. The Pt/Bi2O3catalysts have much higher photocatalytic activities than that of the pure Bi2O3for the degradation of RhB and 2,4-DCP under visible light irradiation. The photogenerated charge separation, transfer, and capture in the photocatalysis of Pt/Bi2O3were investigated in detail according to the various characterizations and analyses of the photogenerated active species and H2O2. It was revealed that the loaded Pt plays an important mediating role in the efficient separation of photogenerated electron-hole pairs by rapidly transferring electrons from the excited Bi2O3to the surface oxygen. As a result, the reduction of O2to form H2O2by the photogenerated electrons was promoted, leaving more holes on the deep valence band to drive the degradation of organic compounds and the production of ˙OH radicals, which were responsible for the enhanced photocatalysis of Pt/Bi2O3.
authors.affiliation: Department of Chemistry, Renmin University of China, Beijing 100872, People's Republic of China. jlin@chem.ruc.edu.cn.
authors.forename: Kailun
authors.initials: K
authors.lastname: Yang
authors.affiliation: Department of Chemistry, Renmin University of China, Beijing 100872, People's Republic of China. jlin@chem.ruc.edu.cn.
authors.forename: Jia
authors.initials: J
authors.lastname: Li
authors.affiliation: Department of Chemistry, Renmin University of China, Beijing 100872, People's Republic of China. jlin@chem.ruc.edu.cn.
authors.forename: Yang
authors.initials: Y
authors.lastname: Peng
authors.affiliation: Department of Chemistry, Renmin University of China, Beijing 100872, People's Republic of China. jlin@chem.ruc.edu.cn.
authors.forename: Jun
authors.initials: J
authors.lastname: Lin