Phosphorus-Doped Hollow Tubular g-CN for Enhanced Photocatalytic CO Reduction.

Photocatalytic CO reduction is a tactic for solving the environmental pollution caused by greenhouse gases. Herein, NHHPO was added as a phosphorus source in the process of the hydrothermal treatment of melamine for the first time, and phosphorus-doped hollow tubular g-CN (x-P-HCN) was fabricated and used for photocatalytic CO reduction. Here, 1.0-P-HCN exhibited the largest CO production rate of 9.00 μmol·g·h, which was 10.22 times higher than that of bulk g-CN. After doping with phosphorus, the light absorption range, the CO adsorption capacity, and the specific surface area of the 1.0-P-HCN sample were greatly improved. In addition, the separation of photogenerated electron-hole pairs was enhanced. Furthermore, the phosphorus-doped g-CN effectively activated the CO adsorbed on the surface of phosphorus-doped g-CN photocatalysts, which greatly enhanced the CO production rate of photocatalytic CO reduction over that of g-CN.