Improved performance of photosynthetic H2O2 and photodegradation by K-, P-, O-, and S-co-doped g-C3N4 with enhanced charge transfer ability under visible light

Elemental doping can modulate the electronic and molecular structure of g-C3N4 to improve its photocatalytic properties. In this study, potassium (K), phosphorus (P), oxygen (O), sulfur (S) were doped into photocatalyst (K, P, O, S/g-C3N4), four-element was successfully prepared. UV–vis diffuse reflection spectroscopy, photoluminescence, transient photocurrent revealed that co-doping with K, O S broadens visible response accelerates transfer photogenerated charges. Under light irradiation, H2O2 concentration produced S/g-C3N4 12.85 times higher than g-C3N4. Moreover, tetracycline (TC) be effectively degraded by in surface water. The degradation pathway TC structures 12 intermediates analyzed liquid chromatography-mass spectrometry. superoxide radical (·O2−) trapping-electron spin resonance (ESR) technique confirmed ·O2− is main active species system. Therefore, strategy adopted research proved feasibility increasing amount degrading antibiotics natural water under light.