Key Words:Bismuth compounds;Azo dyes - Bromine compounds - Cadmium telluride - Heterojunctions - II-VI semiconductors - Irradiation - Light - Optical properties - Solar energy - Titanium dioxide
Abstract:Utilizing more solar energy and suppressing recombination of photo-induced charges are primary issues for photocatalyst's design. In this work, BiOBr was introduced into CdTe/TiO<inf>2</inf> to construct a novel ternary BiOBr/CdTe/TiO<inf>2</inf> composite via a facile solvothermal method. The composition, morphologies, optical properties, specific area, and photocatalytic performances were all investigated in detail. The heterojunction among three-dimensional TiO<inf>2</inf> particles, BiOBr and CdTe acts an interfacial channel to boost the charges migration. As a result, the ternary BiOBr/CdTe/TiO<inf>2</inf> heterojunctions exhibited higher visible light photocatalytic activities on photo-decolorization of methyl orange (MO) than the pure TiO<inf>2</inf> and the binary CdTe/TiO<inf>2</inf> and BiOBr/TiO<inf>2</inf>. Furthermore, the ternary BiOBr/CdTe/TiO<inf>2</inf> composites were converted into hollow structure, and showed the better photocatalytic performance, reaching 75% degradation towards MO in 120 min. This study provided an attractive thought to design highly efficient photocatalysts, which possessed a promising for wastewater purification.<br/> © 2019 Elsevier Ltd
Volume:93
Translation or Not:no