Preparation of phosphorus-doped mesoporous g-C3N4 and its photocatalytic degradation of tetracycline hydrochloride

P-doped tunnel-shaped carbon nitride is prepared for the first time using phosphonitrilic chloride trimer as P source and SBA-15 as template. The optimization experiments reveal that 20% P doped tunnel-shaped carbon nitride exhibited the best tetracycline hydrochloride (TC) degradation performance under visible light irradiation. The degradation rate constant is 0.23367 min-1, which is around 3 and 30 times faster than that of carbon nitride without P doping (0.07223 min-1) and without SBA-15 as template (0.00078 min-1). Radical capture experiment shows that h+ and & BULL;O2- are the main reactive radicals in the photocatalytic degradation process. The doped P element can increase the formation rate of & BULL;O2- and reduce the combination of photogenerated electronhole pairs due to the presence of electron capture centers. The photocatalytic mechanism of P-doped tunnelshaped carbon nitride is proposed, providing experimental data and theoretical basis for the practical application in polluted wastewater.

Automated summary

P-doped tunnel-shaped carbon nitride was prepared for the first time using phosphonitrilic chloride trimer as P source and SBA-15 as template. Optimization experiments showed that 20% P doping exhibited the best degradation performance for tetracycline hydrochloride under visible light irradiation. The photocatalytic mechanism of P-doped tunnel-shaped carbon nitride was proposed, providing experimental data and theoretical basis for its practical application in polluted wastewater.