Nano-catalyst Interface Control And Its Photocatalytic Degradation Pollution And Electrolysis Water Oxygen Evolution

Nowadays,environmental pollution and energy shortages have become the main problems that the world needs to solve urgently in rapid economic development.Increasingly reducing fossil energy sources and increasing environmental pollution issues make the establishment of a complete renewable system a top priority.As a substance with a relatively high storage content on the earth,H₂O can be purified and converted into clean energy.And,new approaches will be provided to address water pollution and clean energy shortages.In the degradation of pollutants and energy conversion,efficient photocatalytic degradation and electrocatalytic hydrolysis catalysts have entered the researchers'field of vision.The key to designing efficient and durable photodegradation catalysts and electrolyzed water catalysts is excellent electrical conductivity,a large number of active sites and stable catalytically active structures,which directly affect the efficiency and selectivity.Focusing on the above design principles,the main research content of this paper is divided into the following two aspects:the construction of p-n heterojunctions of polyhedron-like WO₃ and Ag₃PO₄nanoparticles,and their performance in photo-degrading Rh B,kinetics and mechanism research.And,prepare Fe OOH layered metal oxyhydroxide and Co-MOF composite material multi-stage structure electrode?Fe OOH/Co-MOF/NF?and its properties.1.WO₃ nanosheets were prepared by solvothermal method,and then the high temperature calcination treatment method was used to improve the morphology of WO3.polyhedron-like WO₃ was synthesized,and then Ag₃PO₄/WO₃heterojunction nano-catalyst with good photocatalytic degradation performance was prepared by the impregnation precipitation method.A series of characterization methods were used to analyze the prepared nanomaterials.Studies have shown that the introduction of Ag₃PO₄ greatly increases the active sites of the catalyst.Optical properties show that Ag₃PO₄/WO₃ catalyst has stronger visible light absorption capacity than pure WO₃.100%degradation could be obtained for Rh B?30 ppm?on irradiation??>420 nm,350 W xenon lamp?for 7 min,which is a great improvement compared with the individual constituents.The degradation rate for AW-45 was 27 times higher than that of a commercial powder?P25?.In addition,the stability,kinetics and mechanism of the composite catalyst have been studied.The results show that the composite catalyst has higher stability than pure Ag₃PO₄and pure WO₃.The results show that the degradation mechanism is in the Z-configuration transmission mode.The reduction process is concentrated in the CB?conducting band?of Ag₃PO₄ and the oxidation process is mainly concentrated in the VB?valence band?of WO₃.The rapid flow promotes the continuous and efficient progress of the photodegradation reaction.2.A two-step solvothermal method was successfully used to modify the sheet-shaped Fe OOH on the surface of Co-MOF nanosheets,and Fe OOH/Co-MOF/NF multi-level nanosheet array electrodes were prepared.The multi-stage structure composed of MOF and Fe OOH,and the strong interaction between the binder-free interface can significantly promote electron transfer,increase the surface area of electrochemical activity,and provide many open channels for electrocatalytic hydrolysis reactions to promote reactants.Adsorption of the catalyst,which effectively contacts the catalyst with the electrolyte and quickly outputs the precipitated gas products.The research results show that these significant advantages make it an excellent OER catalyst,which can electro-catalyze the decomposition of water in alkaline solutions.In OER catalysis,when the current is 100 m A/cm^-2,the electrode overpotential only needs 257m V,and also in HER catalysis,when the current is 100m A/cm^-2,the electrode overpotential only needs 141m V.In addition,during the stability test at a current density of 50 m A/cm^-2 for up to 100 hours,the oxygen evolution activity of the catalyst was basically unchanged,showing excellent stability.