Engineering 2D compressed layered g-C3N4 nanosheets by the intercalation of BiVO4-Bi2WO6 composites for boosting photocatalytic activities

The traditional bulk graphitic carbon nitride has disadvantages of weak visible light absorption ability and fast charge carrier recombination speed, which greatly limit its further industrial application. In this work, we successfully construct a new ternary heterojunction photocatalyst that 2D compressed layered g-C3N4 nanosheets (CNNs) are modified by the intercalation of BiVO4-Bi2WO6 composites (CVW-I) through one-step hydrothermal method, in which the bismuth precursors are introduced and confined in the interlayer of CNNs and hence the compressed adjacent layers are formed simultaneously in CNNs. Since the close contact of different components with compressed carbon nitride layers, the built-in electric field is relatively formed and the recombination rate between photogenerated electrons and holes is remarkably suppressed. Attributing to these improvements, the as-constructed CVW-I composite achieves more striking photocatalytic activity, and the rate constant of CVW-I reached the highest values for RhB and TC degradation (k = 0.058 min-1 and 0.048 min-1), which are 4.5 and 3.6 times higher than those of carbon nitride, respectively.

Automated summary

By introducing bismuth precursors and confining them in compressed carbon nitride layers, a new ternary heterojunction photocatalyst CVW-I was constructed, effectively suppressing the recombination rate of photogenerated electrons and holes and enhancing photocatalytic activity.