Abstract
The objective of current photocatalysis research is to increase the separation efficiency of photogenerated carriers and convert CO2 into useful resources for human beings. In the present study, TpPa-2-COF was successfully grown in situ on Bi2O2S nanosheets by hydrothermal and thermal solvent two-step experimental method, and a typical p-n heterojunction was constructed by covalent-bond between TpPa-2-COF and Bi2O2S, which significantly improved the photocatalytic activity of CO2. When Bi2O2S@TpPa-2-COF-15 heterojunction was illuminated with 300 W xenon lamp for 3 h, the CO yield reached 19.5 μmol·g−1·h−1, while the CH4 yield reached 6.2 μmol·g−1·h−1. Compared with pure TpPa-2-COF and Bi2O2S, the photocatalytic activity of the Bi2O2S@TpPa-2-COF-15 increased 66.8 and 3.96 times, respectively. Meanwhile, the Bi2O2S@TpPa-2-COF-15 composite showed good stability under multiple cycles. Furthermore, the mechanism of Bi2O2S@TpPa-2-COF heterojunction enhanced photocatalytic reduction of CO2 was also proposed. The experimental and characterization findings have shown that the transit of photo-generated electron-hole pairs via TpPa-2-COF to Bi2O2S may be greatly promoted to achieve the effect of electron hole separation under visible-light irradiation.
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