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Synthesis of Fe3+-incorporated open-framework gallium borate catalyst for photocatalytic CO2 reduction driven by visible light irradiation

Abstract

Gallium borates semiconductors have been developed as effective photocatalysts for water splitting driven by UV light irradiation, but there is no relevant study for the CO2 photoreduction application. Herein, we report the first systematic investigation of open-framework gallium borate—Ga9B18O33(OH)15•H3B3O6•H3BO3 (Ga-PKU-1) applying to photocatalytic CO2 reduction under visible light irradiation by doping Fe3+ ion doping onto the framework. Using hydrothermal method, a series of Fe3+-incorporated Ga-PKU-1 have been successfully obtained, and a high Fe3+-to-Ga3+ substitution content (~10 atom %) can be achieved. The Ga-PKU-1:xFe3+ (x = 0.02 ~ 0.10) photocatalysts are characterized completely by diverse tests (e.g., XRD, XPS, UV-Vis DRS, SEM, N2 sorption). The effective replacement of Ga3+ ion by Fe3+ ion could inhibit the degree of crystallinity of Ga-PKU-1, and also significantly expands the scope of spectral response from UV light to visible light. Compared with bare Ga-PKU-1, Ga-PKU-1:0.10Fe3+ exhibits remarkable CO formation rate of 3.2 μmol/h/g at 30 °C, and the selectivity for CO evolution exceeds 91.4 %. Besides, the CO formation rate increases to 8.3 μmol/h/g after thes loading of Ag as the co-catalyst. After four cycles of photocatalytic CO2 reduction reaction experiments, it still gives constant CO evolution rate and the catalyst is stable. Furthermore, the thermal behavior research indicates Ga-PKU-1:xFe3+ could maintain structural stability at 400 °C.

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Publication details

The article was received on 11 Oct 2018, accepted on 18 Dec 2018 and first published on 19 Dec 2018


Article type: Research Article
DOI: 10.1039/C8QI01101J
Citation: Inorg. Chem. Front., 2018, Accepted Manuscript
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    Synthesis of Fe3+-incorporated open-framework gallium borate catalyst for photocatalytic CO2 reduction driven by visible light irradiation

    Q. Li, L. Zhang, P. S. Zhao, J. Yin, J. Xia, Z. Sheng, F. Wang, Z. Wang, C. Yin and J. Lin, Inorg. Chem. Front., 2018, Accepted Manuscript , DOI: 10.1039/C8QI01101J

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