Preparation of g-C3N4/TiO2 Heterojunction Composite Photocatalyst by NaCl Template Method and Its Photocatalytic Performance Enhancement

Photocatalytic technology is currently the most promising technology for environmental pollution control. The preparation of photocatalysts with excellent properties is the core of the development of photocatalytic technology. TiO2 can form a heterojunction with g-C3N4, which can effectively inhibit the recombination of photogenerated electron-hole pairs, improve the mobility of photogenerated carriers, and thus improve the photocatalytic performance. In this study, NaCl was used as a template, and the loose and porous g-C3N4/TiO2 heterojunction composite photocatalysts were prepared by the template method. Compared to the pure g-C3N4 prepared by the conventional thermal polycondensation method and TiO2, the g-C3N4/TiO2 heterojunction composite photocatalysts prepared in this study exhibited a greatly increased specific surface area, an improved light absorption performance, a significantly suppressed recombination of photogenerated electrons and holes. Furthermore, the g-C3N4/TiO2 heterojunction composite photocatalysts exhibited excellent photocatalytic performance.