Preparation of bismuth oxyiodides and oxides and their photooxidation characteristic under visible/UV light irradiation

Journal Article · Sat Jan 15 00:00:00 EST 2011 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2010.08.013· OSTI ID:22209985

Yu, Changlin ^[1]; Fan, Caifeng ^[1]; Yu, Jimmy C. ^[2]; Zhou, Wanqin ^[3]; Yang, Kai ^[1]

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1. School of Materials and Chemical Engineering, Jiangxi University of Science and Technology, 86 Hongqi Road, Ganzhou 341000, Jiangxi (China)
2. Department of Chemistry, The Center of Novel Functional Molecules, and Environmental Science Programme, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong (China)
3. School of Information Engineering, Jiangxi University of Science and Technology, 86 Hongqi Road, Ganzhou 341000, Jiangxi (China)

Bismuth oxyiodides and oxides were prepared by a solution combination with thermal treatment method. The prepared samples were characterized by X-ray diffraction, thermogravimetry, scanning electron microscopy, transmission electron microscopy, and UV-vis diffuse reflectance spectra, and Brunauer-Emmett-Teller surface areas. The photooxidation activity of the samples was evaluated by photocatalytic decolorization of acid orange II under both visible light ({lambda} > 420 nm) and UV light ({lambda} = 365 nm) irradiation. Results show that a series of changes in the compounds take place during the course of calcination, described as: BiOI {yields} Bi{sub 5}O{sub 7}I {yields} {alpha}-Bi{sub 2}O{sub 3}. Under visible light irradiation, the photocatalytic activities follow the order: BiOI > Bi{sub 5}O{sub 7}I > Bi{sub 5}O{sub 7}I/Bi{sub 2}O{sub 3} mixture > Bi{sub 2}O{sub 3}, which is mainly attributed to the different absorption ability to visible light due to the different band gap energy; the activities are in the order: BiOI < Bi{sub 2}O{sub 3} < Bi{sub 5}O{sub 7}I/Bi{sub 2}O{sub 3} mixture < Bi{sub 5}O{sub 7}I under UV light irradiation, which is mainly caused by the different oxidability.

• OSTI ID: 22209985
• Journal Information: Materials Research Bulletin, Vol. 46, Issue 1; Other Information: Copyright (c) 2010 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ABSORPTION
BISMUTH
BISMUTH OXIDES
HEAT TREATMENTS
INORGANIC COMPOUNDS
IRRADIATION
OXYIODIDES
PHOTOCATALYSIS
SCANNING ELECTRON MICROSCOPY
SPECTRA
SYNTHESIS
THERMAL GRAVIMETRIC ANALYSIS
TRANSMISSION ELECTRON MICROSCOPY
ULTRAVIOLET RADIATION
X-RAY DIFFRACTION