0D/2D Z-schemed carbon nitride quantum dots/Bi2MoO6-xwith enhanced carriers' separation efficiency toward oxidation coupling of amines under ambient conditions

Organic synthesis driven by solar energy is receiving extensive attention due to its inherent merits like higher target product selectivity as well as milder reaction condition. While sluggish photoinduced charge carriers' separation kinetic severely limited its utilization efficiency, leading to inefficient catalytic performance or energy-consuming reaction conditions. Assembling 0D/2D Z-schemed semiconductor nano-heterojunction would be a promising candidate for solving such problem. Herein, 0D/2D carbon nitride quantum dots (CNQDs)/ Bi2MoO6-x (BMO-OD) was devised and synthesized by facile NaBH4-mediated hydrothermal method. The CNQDs/BMO-OD exhibited superior catalytic activity toward amines oxidation coupling under ambient condi-tions. Broad substrates suitability as well as excellent photochemical stability implies it would be a robust alternative amines oxidation coupling photocatalyst under mild conditions. The superior photocatalytic per-formance is attributed to expeditious photoinduced charge carriers' separation and transfer of Z-schemed het-erostructures and unique multipoint contact interface of 0D/2D. Scavenger experiments and ESR results demonstrates h+ and center dot O2- radicals play a major role in aerobic conditions while only h+ paly predominant role in anerobic conditions. The design and synthesis of 0D/2D CNQDs/BMO-OD Z-scheme heterostructures would be beneficial for boosting photoinduced carriers' separation kinetic, thus promoting the photocatalytic oxidation coupling of amines under mild conditions.

Automated summary

Organic synthesis driven by solar energy is gaining attention for its advantages of selectivity and milder reaction conditions. However, the inefficient utilization efficiency due to slow charge separation limits its catalytic performance. Assembling 0D/2D Z-schemed semiconductor nano-heterojunctions can be a promising solution. In this study, 0D/2D carbon nitride quantum dots (CNQDs)/Bi2MoO6-x (BMO-OD) was synthesized, showing superior catalytic activity for amine oxidation coupling under ambient conditions. The design and synthesis of 0D/2D CNQDs/BMO-OD can enhance the photoinduced charge carriers' separation kinetics, promoting the photocatalytic oxidation coupling of amines under mild conditions.