Preparation of BiOBr/CN heterojunctions and analysis of the performance of photocatalytic reduction of CO<sub>2</sub>

Abstract It is an important subject for the development of new and efficient photocatalysts for the photocatalytic reduction of CO₂. In recent years, two-dimensional bismuth halide oxide has become a photocatalytic material of great interest due to its unique tunable layered structure and excellent photogenerated charge separation ability. In this study, based on the advantages of two-dimensional (2D) heterojunction catalysts with tunable band gap and short charge transfer distance, we aim to prepare size-matched BiOBr/CN 2D/2D heterojunction photocatalysts and investigate their photocatalytic CO₂ reduction performance. A series of BiOBr/CN composite photocatalysts were prepared by varying the amount of CN added. The morphology and structure of the BiOBr/CN composites were characterised by XRD, FTIR, SEM, TEM, HRTEM and XPS, and the successful preparation of the 2D/2D composites was confirmed. The results of the photocatalytic CO₂ reduction tests showed that all the BiOBr/CN composite photocatalysts exhibited enhanced photocatalytic activity compared to pure CN and BiOBr. Within 3 h of illumination, BiOBr/CN-0.15 showed the best photocatalytic activity with a CO evolution rate of 6.6 μmol·g^-1·h^-1, 3.8 and 16.0 times that of CN and BiOBr, respectively, and a CH₄ production rate of 0.7 μmol·g^-1·h^-1, three times that of CN. The results of band structure, PL spectra and electrochemical tests showed that a type II heterojunction was formed by combining BiOBr and CN, and the presence of the heterojunction promoted the separation and migration of photogenerated carriers, allowing more photogenerated electrons to reach the catalyst surface and participate in the CO₂ reduction reaction, thus significantly improving the performance of photocatalytic CO₂ reduction. This study is of great value for the design and application of BiOBr-based 2D/2D heterojunction photocatalysts.

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	LIU Xuemei
	LUO Xiuyu
	WANG Hua

Keywords： photocatalytic reduction of CO₂ heterojunction carbon nitride BiOBr

Received 2023-05-03;

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LIU Xuemei, LUO Xiuyu, WANG Hua.Preparation of BiOBr/CN heterojunctions and analysis of the performance of photocatalytic reduction of CO₂[J] Chemcial Industry and Engineering, 2024,V41(6): 1-11

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