Preparation And Catalytic Performances Of Novel Photo-Fenton-like Catalyst

Recently,advanced oxidation technologies?AOTs?have been utilized for eliminating water pollution.It not only degrads the dyes completely and broaden pH range,but also can show high stability and reduce cost.It plays an important role in the degradation of organic pollutants for high efficiency,high stability and low-cost.In this paper,a highly efficiencient photo-Fenton catalyst was prepared by solution method and the obtained samples were characterized by SEM,XRD,Roman and UV-vis to analyzed the morphology,structure.Based on photocatalysis,Fenton oxidation and photo-Fenton oxidation,We systematically analyzed the reaction mechanism photo-fenton activity and reaction mechanism.1.CuO was prepared by one step hydrothermal method using copper acetate as precursor.Three-dimensional nanostructured Ag3PO4/CuO composite catalyst was synthensised by the reaction of Ag⁺in mix solution.The results of XRD show that CuO and Ag₃PO₄ respectively belong to monoclinic and cubic crystal structure.The composite catalyst display strong catalytic activity under visible light with the assistance of H2O2,which was mainly related to three factors:Firstly,UV spectrum indicate that the addition of nano CuO particles increases the absorption of Ag₃PO₄ in the visible region;Secondly,due to the Fenton-like performance of CuO,which promotes the decomposition of H₂O₂ into·OH;Thirdly,photogenerated electrons and holes are produced under irradiation of visible light and recombine not easyly because of the Z-type mechanism,thus accelerating the degradation rate of organic pollutants.Three kinds of Ag3PO4/CuO composite catalysts prepared by different molar ratios and showed different catalytic properties when degrading rhodamine B?RhB?,and an optimum ratio?AC1.0?could be found,RhB can be completely degraded in 20min when the amount of H₂O₂ is 100?L.Dried and recycled the catalyst,the nanocomposite shows excellent stability and recyclable property toward the photodegradation of RhB after five-cycling.2.The g-C₃N₄ sheet was synthesized by two-step calcination method using thiourea as the precursor,and then the copper source and the solvent were introduced by solvothermal method to make the CuO grow in situ on the C3N4 that the two-dimensional nanostructured composite catalyst was prepared.Compared with pure g-C₃N₄ and pure CuO,the catalytic performance was obviously improved.UV test showed that the addition of nano CuO increased the absorption of C3N4 in the visible region;Due to the CuO Fenton performance,H₂O₂ could be decomposed into·OH,contributing to the separation of photo-generated electrons and holes and matching band structure so that improve the photocatalytic performance of g-C3N4;Three kinds of g-C3N4/CuO composite catalysts were prepared by different molar ratio of reactants,which showed different catalytic properties in the degradation of rhodamine B?RhB?.The experimental results indicate the best performance that RhB can be completely degraded in 6 min.3.Copper-doped BiVO₄ catalysts were prepared by solvothermal method without surfactant using Bi?NO₃?₃,NH₄VO₃,Cu?Ac?₂ as source of Bi,V and Cu to obtain a monoclinic scheelite structure.The concentration of Cu?Ac?₂ was controlled to synthesize different Cu-doped BiVO₄ materials.Cu-doped BiVO₄ does not change BiVO₄ monoclinic scheelite structure,but change the lattice parameter,which caused the redshift of the reflectance spectrum.As a result,it increased absorption of visible-light and the coexistence of Cu²⁺/Cu⁺activated the Fenton-like catalytic reaction.The experimental results show that the best catalytic performance is 3 times than pure BiVO₄,which can decompose methylene blue?MB?completely in 20 minutes.