MOF衍生的g-C3N4/ZnIn2S4 S型异质结:界面工程增强光催化NO转化OA

Addressing the growing challenge of nitrogen oxides(NOx)pollution in the atmosphere requires the development of photocatalysts with both high efficiency and strong selectivity.In this study,a g-C3N4/ZnIn2S4(CN/ZIS)S-scheme heterojunction photocatalyst was constructed,in which ZnIn2S4 with a hollow tubular morphology was synthesized via a MOF-derived strategy,and g-C3N4 served as an efficient electron transfer platform.The optimized CN/ZIS-0.1 exhibited remarkable photocatalytic efficacy under visible-light radiation,attaining a NO removal efficiency of 67.29%,markedly surpassing that of pristine g-C3N4(41.41%)and ZIS(27.8%).Additionally,a high NO-to-nitrate selectivity of 77.47%was attained,exceeding that of pristine g-C3N4(49.01%).The material characterization results revealed that CN/ZIS-0.1 not only has a wider light absorption range but also its unique structure provides more reaction sites.Further photoelectrochemical measurements and DFT simulations confirm that the built-in electric field(BIEF)formed at the CN/ZIS interface facilitates the directional migration of photogenerated electrons towards the g-C3N4 surface,and photogenerated holes migrate towards the surface of ZIS,thereby promoting the generation of key reactive species and enhancing NO adsorption.This work not only demonstrates the potential of constructing S-scheme heterojunctions by coupling MOF-derived hollow structures with two-dimensional semiconductors for NO oxidation,but also offers an effective strategy for developing highly selective NO photocatalysts.