Construction and Photocatalytic Property of Two-Dimensional BiOBr/g-C3N4 Photocatalytic

The development of efficient and stable photocatalytic materials is the key to the application of photocatalytic technology. In this paper, urea, bismuth nitrate and potassium bromide were used as raw materials, BiOBr/g-C3N4 composite photocatalysts ( Bix/ CN) with different mass ratios were prepared by one-step hydrothermal method. Based on the results of UV-Vis, the calculated E-CB values of BiOBr and g-C3N4 are 0.52 eV and -1.1 eV, respectively, while the calculated E-VB values of BiOBr and g-C3N4 are 3.38 eV and 1.55 eV, respectively. Photoelectric catalytic performance tests show that Bi3/CN has the higher photocurrent density and lower charge transfer resistance. When the visible light irradiation time is 10 min, the total removal rate of RhB by Bi-3/CN is 81.35%. The total removal rate of RhB by Bi-3/CN decreases by only 6% after reused for 5 cycles, indicating that Bi-3/CN has high and stable photocatalytic efficiency for RhB. The improvement of photocatalytic efficiency of composite photocatalyst mainly depends on the effective coupling of the two- dimensional monomers, and the effective interface contact improves the photogenerated electron transfer and carrier separation efficiency. The photocatalytic enhancement mechanism is proposed as that the accumulated electrons on CB of g-C3N4 for generation of center dot O-2(-) are the essential reason for the improvement of photocatalytic performance.