Phosphorous Doped Carbon Nitride Nanobelts for Photodegradation of Emerging Contaminants and Hydrogen Evolution

Abstract Photocatalysis has demonstrated great potentials for both environmental remediation and green energy production. In this study, a simple solvothermal template-free approach was employed for the first time to synthesize phosphorous doped carbon nitride nanobelt (P-CN-NB). Advanced characterizations, for instance, 13 C NMR, 31 P NMR, and XPS results indicated that P was substitutionally doped at the corner-carbon of the carbon nitride frameworks. The introduction of P dopants inhibited the polymerization between NH 2 groups within P-CN-NB, enabling the decrease in nanobelt width for the exposure of more active sites. Therefore, the optimized P-CN-NB-2 (derived from 0.2 mM H 3 PO 4 ) rendered enhanced p-hydroxybenzoic acid (HBA) degradation nearly 66-fold higher than bulk g-C 3 N 4 , among the most efficient g-C 3 N 4 -based photocatalysts as reported. In addition, the P-CN-NB-1 (derived from 0.02 mM H 3 PO 4 ) exhibited about 2 times higher H 2 evolution rate than CN-NB. Density functional theory (DFT) calculations were also conducted to provide insights into the mechanism.