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Title: A novel nano-sized BiOBr decorated K{sub 2}La{sub 2}Ti{sub 3}O{sub 10} with enhanced photocatalytic properties under visible light

BiOBr-sensitized–K{sub 2}La{sub 2}Ti{sub 3}O{sub 10} composite photocatalysts (BiOBr/K{sub 2}La{sub 2}Ti{sub 3}O{sub 10}) were fabricated by depositing BiOBr particles on the surface of K{sub 2}La{sub 2}Ti{sub 3}O{sub 10} through a solvothermal method. The deposited BiOBr particles, with a uniform size of approximately 50 nm, were well dispersed on the surface of K{sub 2}La{sub 2}Ti{sub 3}O{sub 10}, and improved the visible light absorption of the composite material. The photocatalytic activities were evaluated by degrading Rhodamine B (RhB) under visible light irradiation. The BiOBr/K{sub 2}La{sub 2}Ti{sub 3}O{sub 10} composites exhibited superior performance over pure BiOBr, and the deposition of BiOBr particles onto the host K{sub 2}La{sub 2}Ti{sub 3}O{sub 10} significantly increased the photocatalytic decolorization ability of K{sub 2}La{sub 2}Ti{sub 3}O{sub 10}. An optimum loading of 45 wt% was found, and almost 95% of RhB could be degraded in 60 min under visible light irradiation using this preparation. Furthermore, the photocatalytic activity was stable in up to five consecutive runs. The enhancement in both photocatalytic activity and stability in the composites resulted from the closely contacted interfaces, which were beneficial for charge separation. The roles of the radical species were investigated, and the {sup ·}O{sub 2}{sup −} and h{sup +} were thought to dominatemore » the photocatalytic process, while the {sup ·}OH was found to be relatively negligible. Based on the experimental results, a photocatalytic mechanism for organics degradation over BiOBr/K{sub 2}La{sub 2}Ti{sub 3}O{sub 10} photocatalysts was proposed. - Graphical abstract: Photocatalytic reaction mechanisms of the as-prepared BiOBr/K{sub 2}La{sub 2}Ti{sub 3}O{sub 10}. - Highlights: • BiOBr particle modified K{sub 2}La{sub 2}Ti{sub 3}O{sub 10} were successfully synthesized by solvothermal method. • BiOBr greatly increased visible light absorption for K{sub 2}La{sub 2}Ti{sub 3}O{sub 10}. • The photocatalyst exhibited high activities for organics degradation. • Mechanisms of charge separation in the BiOBr/K{sub 2}La{sub 2}Ti{sub 3}O{sub 10} composites were proposed.« less
Authors:
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Publication Date:
OSTI Identifier:
22334266
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Solid State Chemistry; Journal Volume: 215; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 77 NANOSCIENCE AND NANOTECHNOLOGY; ABSORPTION; COMPOSITE MATERIALS; DEPOSITION; DEPOSITS; IRRADIATION; NANOSTRUCTURES; PARTICLES; PHOTOCATALYSIS; REACTION KINETICS