g-C3N4-based S-scheme photocatalyst

Graphitic carbon nitride (g-C3N4) is a promising photocatalyst employed in various kinds of photocatalytic reactions. It has many virtues, including facile preparation, visible light response, nontoxicity, and high chemical stability. However, pure g-C3N4 photocatalyst exhibits unsatisfactory activity because of the recombination of photogenerated electrons and holes and the weak oxidation ability of photogenerated holes. To address these issues, numerous efforts are made to fabricate g-C3N4-based S-scheme photocatalysts by coupling g-C3N4 and oxidation photocatalysts (OP). The incorporation of OP promotes charge separation and reinforces the oxidation ability of the S-scheme heterojunction. Themed on g-C3N4-based S-scheme photocatalysts, this chapter begins with the history, basic properties, and preparation methods of g-C3N4. The subsequent content focuses on four representative g-C3N4/metal oxides S-scheme photocatalysts. The synthesis strategy, photocatalytic performance, and charge transfer mechanism are emphasized. Eventually, prospects of g-C3N4-based S-scheme photocatalysts are suggested.