Efficient degradation of PPCPs by Mo1−xS2−y with S vacancy at phase-junction: Promoted by innergenerate-H2O2

Currently, inner-generate hydrogen peroxide to enhance the degradation of pollutants is an outstanding way. However, few studies have been done on MoS2 photocatalysts with sulfur vacancies at the phase-junction to produce innergenerate-H2O2 to promote contaminants degradation. Herein, we prepared Mo1−xS2−y photocatalysts with sulfur vacancies at the phase-junction by a simple method (temperature-programmed reduction in hydrogen atmosphere) to achieve high innergenerate-H2O2 and high degradation efficiency. Specifically, Mo1−xS2−y exhibited a high yield of innergenerate-H2O2 (35 μmol L−1 h−1, 1.5 times as high as bulk MoS2) under simulated solar irradiation, because the promoted electron transfer can increase superoxide radical to generate innergenerate-H2O2. Hydroxyl radicals generated by decomposition of innergenerate-H2O2 through the transformation of variable metal molybdenum atom (Mo(Ⅳ)/Mo(Ⅵ)) can effectively improve the degradation efficiency of tetracycline and diclofenac sodium (twice as high as bulk MoS2). The novel and concise way was paved to synthesize photocatalysts for high-efficiency photocatalytic degradation by innergenerate-H2O2. Illustrates the mechanism of innergenerated-H2O2 to improve photodegradation of PPCPs. [Display omitted] •Mo1−xS2−y with S vacancy in 1T phase at phase-junction was synthesized.•S vacancy results in lamellar curly, increasing reaction active sites and oxygen adsorption sites.•Photoexcited carriers and •O2- generated by adsorbed O2 can promote the formation of H2O2.•Mo1−xS2−y achieves high photodegradation properties through •OH decomposed by innergenerated-H2O2.