Differences of Characteristics and Performance with Bi3+ and Bi2O3 Doping Over TiO2 for Photocatalytic Oxidation Under Visible Light
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Bi-doped TiO2 photocatalysts were synthesized by sol with a high-pressure hydrothermal method and developed for the photocatalytic degradation of formaldehyde under the visible light irradiation and ambient temperature. According to characterization, some Bi-doped TiO2 can be transformed into the distinctive crystals phase of Bi4Ti3O12, which was crucial for improving activity. The excess Bi2O3 doping into TiO2, such as Bi2O3–N/TiO2 and Bi2O3–C/TiO2, generated a mixed oxides with Bi2O3 and Bi4Ti3O12, was not beneficial to increase the activity of HCHO oxidation, whereas Bi3+/TiO2 composed of TiO2 and Bi4Ti3O12 displayed a higher activity with good stability. It is noteworthy that Bi3+/TiO2 didn’t show the lowest binding energy. However, it exhibited a lower PL intensity, higher adsorption, and activity due to the uniform particulates, high surface areas, and the strong interaction between TiO2 and Bi4Ti3O12, attributing to create superoxide radical anion (.O2−) and hydroxyl radical (.OH). The present results of Bi3+/TiO2 indicated that HCHO could be effectively oxidized from 1.094 to 0.058 mg/m3 (94.7%) under visible light irradiation within 36 h. The current research made effort to draw out the existing state of Bi, which can be better, Bi3+ or Bi2O3, doped in the TiO2.
KeywordsTiO2 Bi-doped Photocatalytic oxidation Formaldehyde Visible light
This work was financially supported by the Natural Science Foundation of Jiangsu Province (Nos. BK20170954 and BK20150890), the National Natural Science Foundation of China (No. 21501097), the Qing Lan Project of the Jiangsu Higher Education Institutions of China, the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD), the Top-notch Academic Programs Project of Jiangsu Higher Education Institutions (PPZY2015C222), the Jiangsu Engineering Technology Research Centre of Environmental Cleaning Materials and Open Research Fund Program of Jiangsu Key Laboratory of Atmospheric Environment Monitoring & Pollution Control (KHK1806), A projected funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).
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