▎ 摘　　要

NOVELTY - Graphitic carbon nitride (g-C3N4) based magnetic photocatalyst comprises 45-50 wt.% K and P co-doped g-C3N4 (KPCN), 5-7 wt.% graphene oxide (GO) and 45-50 wt.% alkaline-earth metal ferrite (AFe2O4). USE - The photocatalyst is useful for degradation of pollutants present in wastewater or polluted waters. ADVANTAGE - The photocatalyst: has high absorption of visible light or low light, high lifetime of charge carriers, slow migration of charge, very efficient for pollutant degradation e.g. antibiotics (tetracycline), appropriate band positions for visible light activation and enhanced pollutant degradation; and is easy to separate from the reaction mixture after the completion of the reaction which enhances the efficiency. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing g-C3N4 based magnetic photocatalyst comprising (I) producing KPCN by a hydrothermal method, (II) dissolving 2 wt.% KPCN and 0.2 wt.% GO in distilled water and ultrasonicating for 1.5-2.5 hours to obtain a homogeneous solution, (III) dissolving 8 wt.% ferric nitrate nonahydrate and 3 wt.% A(NO3)2-6H2O in distilled water and stirring for 1.5-2.5 hours to obtain another homogeneous solution, (IV) adding the step (II) solution in the step (III) solution and stirring at room temperature for 6-7 hours, (V) autoclaving the stirred solution in an autoclave at 175-185° C for 10-14 hours, and (VI) collecting precipitate from the autoclaved solution and washing, (VII) drying the washed precipitate at 75-85° C to obtain graphitic carbon nitride based photocatalyst (KPCN/GO/AFe2O4).