In-situ N-doped TiO2/mesoporous g-C3N4 nanosheets S-scheme heterojunction derived from supramolecular precursor with enhanced visible-light photocatalytic performance

The N-doped TiO 2 /g-C 3 N 4 S-scheme heterojunction with holy nanosheet framework has been synthesized by a simple pyrolysis process of amorphous TiO 2 and melamine-cyanaurate complex.During the formation of heterojunction photocatalysts, the interaction of two precursors not only provided in-situ nitrogen doping in TiO 2 , but also construct S-scheme charge transfer channel.Also, N-TiO 2 /g-C 3 N 4 exhibited a porous nanosheet structure due to the co-crystallization of TiO 2 and g-C 3 N 4 at 450°C.The enhancement in narrower bandgap and photogenerated charge carrier separation resulted in superior photocatalytic activities with the highest degradation rate of Methylene blue was recorded by MCN/T-50, which was 2.3 and 3.7 times that of bulk g-C 3 N 4 and pristine TiO 2 .The possible mechanism for the enhanced photocatalytic performance is proposed in this study.The doped S-scheme heterojunction materials prepared from the co-crystallization of precursors in calcination give a broad prospect for the future design of a highly efficient visible-light-driven photocatalyst.