In situ synthesis of g-C3N4/TiO2 heterostructures with enhanced photocatalytic hydrogen evolution under visible light

2017 
Graphitic carbon nitride (g-C3N4) nanosheets/titanium dioxide (TiO2) nanoparticles heterostructures have been in situ synthesized via a modified sol–gel method combined with a calcination process. The prepared g-C3N4/TiO2 heterostructured composites exhibited excellent photocatalytic hydrogen generation from water splitting under visible light irradiation. It was found that the TiO2 nanoparticles are well-dispersed on the g-C3N4 nanosheets. The as-obtained g-C3N4 coupled with TiO2 not only increased the surface area of g-C3N4, but also promoted the separation of photo-generated charge carriers. The developed composite exhibits an excellent hydrogen evolution rate of 40 μmol h−1, which is about 2.7 times higher than that of pure g-C3N4 nanosheets.
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