氧化铜和硫、磷共掺杂g-C3N4降解盐酸四环素性能OA

Photocatalytic degradation technology is a powerful tool for wastewater treatment due to its high efficiency and environmental friendliness.In this paper,CN-SP(S/P co-doping g-C3N4)was synthesized via thermal polymerization using melamine,ammonium phosphate,and thiourea as precursors.Subsequently,a composite photocatalyst,CN-SP-CuO,was constructed by forming a heterojunction through ball-mill modification of CN-SP and CuO.The morphology and physical properties of CN-SP-CuO composites were characterized and analyzed by SEM,XRD,BET,XPS,UV-Vis DRS,PL and photoelectrochemical measurements.The results demonstrate that S/P co-doping increases the specific surface area of g-C3N4,while both S/P co-doping and CuO heterojunction modification enhance the visible-light absorbance of g-C3N4,suppress the recombination rate of photogenerated electron-hole pairs,and improve the photocatalytic activity.In the photocatalytic degradation of tetracycline hydrochloride,the optimal sample,CN-SP-CuO-2,achieves a degradation rate of 89.4％under visible light.Radical quenching experiments reveal that superoxide radicals(·O2-)play a predominant role in the photocatalytic degradation process.