首页|S-scheme heterojunction g-C3N4/Ag/AgNCO for efficient tetracycline removal in a photo-assisted peroxymonosulfate system
S-scheme heterojunction g-C3N4/Ag/AgNCO for efficient tetracycline removal in a photo-assisted peroxymonosulfate system
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NSTL
Photo-assisted peroxymonosulfate(PMS)activation process is emerging as an effective and eco-friendly technology for sewage purification.Herein,a g-C3N4-based S-scheme heterostructure(g-C3N4/Ag/AgNCO)was fabricated by a facile chemical-deposition and photo-reduction method.Because of intensive hetero-interface contact and synergistic effect between g-C3N4 and Ag/AgNCO,the assembled heterojunction exhibits enhanced light absorption,rapid charge separation/transport and impressive catalytic performance.Tetracycline(TC)degradation efficiency of 98% with a rate constant of 0.2995 min~(-1)can be accomplished over 40%-g-C3N4/Ag/AgNCO/PMS/light system within 12 min,3.05 and 4.86 times better than that obtained over g-C3N4/PMS/light and AgNCO/PMS/light system,respectively.The quenching/ESR investigation suggested that the active species function syngenetically in TC degradation and the significance follows the order of h~+>SO_4~(·-)-~·O_2~(·-)>~O_2>~·OH.The cyclic test proved the excellent stability of the current catalyst system.The involved degradation routes,intermediates,and toxicity assessment have been studied in detail.The current research may serve as a versatile tactic for designing the g-C3N4-based functionalized catalytic material for wastewater purification through the photocatalysis/sulfate-mediated advanced treatment process.
NSTL
