In situ growth of all solid Z scheme heterojunction photocatalyst of Bi7O9I3/g C3N4 and high efficient degradation of antibiotic under visible light
Abstract To reduce the recombination of electron hole pairs, broaden the response scope to visible light, improve the synthesis method and enhance the photocatalytic efficiency of graphite phase carbon nitride (g C3N4) a novel all solid direct Z scheme heterojunction photocatalyst was successfully constructed by in situ growth of bismuth oxyiodide (Bi7O9I3) on ultrathin g C3N4. The synthesis process was finished under a normal pressure and temperature without any toxic or harmful reagents. As prepared photocatalyst of BCN 0.2 can be easily excited under visible light and shows an excellent photo degradation and mineralization capacity of doxycycline hydrochloride. Oxhydryl and superoxide radicals are dominant. Moreover, the Z scheme heterojunction Bi7O9I3/g C3N4 has quite stable crystal structure and recycling ability. The present work exhibits a mild and feasible synthesis method for an all solid direct Z scheme heterojunction to improve the photocatalytic ability of pollutants.