  Increasing the efficiency of charge transfer and separation efficiency of
photogenerated carriers are still the main challenges in the field of
semiconductor-based photocatalysts. Herein, we synthesized g-C3N4@V2C MXene
photocatalyst by modifying g-C3N4 using V2C MXene. The prepared photocatalyst
exhibited outstanding photocatalytic performance under visible light. The
degradation efficiency of methyl orange by g-C3N4@V2C MXene photocatalyst was
as high as 94.5%, which is 1.56 times higher than that by g-C3N4. This was
attributed to the V2C MXene inhibiting the rapid recombination of
photogenerated carriers and facilitating rapid transfer of photogenerated
electrons (e) from g-C3N4 to MXene. Moreover, g-C3N4@V2C MXene photocatalyst
showed good cycling stability. The photocatalytic performance was higher than
85% after three cycles. Experiments to capture free radicals revealed that
superoxide radicals (02) are the main contributors to the photocatalytic
activity. Thus, the proposed g-C3N4@V2C MXene photocatalyst is a promising
visible-light catalyst.
