Defect Regulated Hollow Metal Sulfides And Their Photocatalytic Oxidation Of Benzyl Alcohols

In recent years,the synthesis of most organic compounds is usually carried out under very demanding conditions,which resulted a large amount of energy consumption and environmental pollution.Organic synthesis of photocatalytic oxidation using economical and clean solar energy has the potential to provide a green route for the synthesis of most important industrial chemicals.However,the biggest challenges are low conversion and poor selectivity.Therefore,by exploring suitable semiconductor photocatalysts,introducing surface defects such as vacancies and functional modifications on the surface of them is an effective strategy to improve the conversion and selectivity of related photocatalytic reactions.In addition,metal sulfides with hollow multistage structures have multiple intrinsic advantages of multiphase photocatalysis,including increased light absorption,accelerated charge separation and transfer,and enhanced surface redox reaction kinetics.Focusing on the design of hollow multilevel nanostructures and exploring the influence of defects on the carrier separation and photocatalytic reaction performance in photocatalysts,this paper modified the defects through interface and doping engineering respectively,and carried out the following work.The specific content is as follows:1.Based on MOF-derived strategies,it has been prepared from MIL-68（In）as a form template,and it has a unique imitation ZnIn₂S₄ nanotube,and the deposition of its surface defects induces single-dispersed Ru nanoparticles,revealed mechanism of the influence of interface carrier separation on the formation of high efficiency activated oxygen and benzyl alcohol oxidation.The results showed that the hollow multistage structure of pitcher plant increased the photon capture and enhanced the adsorption of reactant molecules.Metal semiconductor interface design induced more defects generated,not only promoted the separation of the pair,also provided the reactant molecules and oxygen molecule adsorption sites,generated a higher concentration of reactive oxygen species,after the optimization of electron transfer path,the activation of superoxide free radicals can effectively the oxidation of organic molecules,and thus drive the whole of the conversion of benzyl alcohol reaction.This work provided a deeper understanding of the mechanism by which the interface between metal sites and defective semiconductors promotes photocatalytic selective oxidation,and is expected to be further regulated in the future.2.Ru doped CdIn₂S₄ hollow nanospheres were synthesized by a simple hydrothermal method.The mechanism of photocatalytic oxidation of benzyl alcohol by Ru doped CdIn₂S₄hollow nanospheres was investigated based on the difference of electronegativity between heteroatom and its intrinsic atoms.The experimental results displayed that the doping of Ru induced the structural distortion of CdIn₂S₄,produced sulfur vacancy to promote the bulk phase charge transfer,improved the charge collection,and enhances the conversion efficiency of benzyl alcohol.This work provided insight into the mechanism by which atomic doping modifies defective states to promote photocatalytic selective oxidation.