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Preparation of bismuth oxyiodides and oxides and their photooxidation characteristic under visible/UV light irradiation |
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| Authors: | Changlin Yu Caifeng Fan Wanqin Zhou |
| Affiliation: | a School of Materials and Chemical Engineering, Jiangxi University of Science and Technology, 86 Hongqi Road, Ganzhou 341000, Jiangxi, PR China b 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 c School of Information Engineering, Jiangxi University of Science and Technology, 86 Hongqi Road, Ganzhou 341000, Jiangxi, PR China |
| Abstract: | 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 (λ > 420 nm) and UV light (λ = 365 nm) irradiation. Results show that a series of changes in the compounds take place during the course of calcination, described as: BiOI → Bi5O7I → α-Bi2O3. Under visible light irradiation, the photocatalytic activities follow the order: BiOI > Bi5O7I > Bi5O7I/Bi2O3 mixture > Bi2O3, 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 < Bi2O3 < Bi5O7I/Bi2O3 mixture < Bi5O7I under UV light irradiation, which is mainly caused by the different oxidability. |
| Keywords: | A. Inorganic compounds B. Chemical synthesis C. Thermogravimetric analysis |
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