Rational optimization of 2D Bi₂MoO₆ nanopiece@2D g‐C₃N₄ nanoflake composite for boosting photocatalytic performance of hydrogen evolution rate and organic dye removal

BACKGROUND Preparing catalysts with heterojunction structures is a strategy to achieve efficient charge separation and transfer of charges to enhance photocatalytic activity of photocatalysts. To optimize the graphitic carbon nitride (g‐C 3 N 4 )‐based photocatalysts, Bi 2 MoO 6 @ 2D g‐C 3 N 4 catalyst was prepared. RESULTS 2D Bi 2 MoO 6 nanopiece@2D g‐C 3 N 4 nanoflake composites in different proportions were prepared by the hydrothermal method. The prepared materials were characterized by various modern instrumental analyses, and their photocatalytic ability to decompose water and degrade rhodamine B under visible light irradiation was tested. Compared with pure Bi 2 MoO 6 nanopiece and g‐C 3 N 4 nanoflake, the hydrogen evolution rate of Bi 2 MoO 6 nanopiece@g‐C 3 N 4 nanoflake (1:10) composite was highest, at 4847 μmol h −1 g −1 . The composite (3:10) exhibited significantly enhanced photocatalytic rhodamine B degradation for organic dye removal due to the formation of an excellent heterojunction to improve the separation and migration efficiency of photogenerated carriers. CONCLUSION O 2− and • OH were the two main active species in the photocatalytic degradation of rhodamine B. Bi 2 MoO 6 formed a heterojunction with g‐C 3 N 4 , which accelerated separation and migration efficiency, thereby enhancing the photocatalytic activity.