Preparation And Photocatalytic Properties Of Copper Oxide-based Composite Nanomaterials

Looking for the application of new copper-based composite nanomaterials in photocatalysis is the current research hotspot,and it also has good application prospects.However,due to the high cost of preparing CuO and the need to use complex large-scale instruments,the application of CuO photocatalyst in the treatment of environmental pollution is restricted.The composite photocatalyst obtained by recombining CuO with other metals such as Zn O,TiO₂,etc.,has a wider band gap,low utilization of visible light,easy recombination of electron-hole pairs,and low photogenerated carrier migration efficiency Limits its practical application range.Therefore,to study a CuO-based composite photocatalyst with simple preparation and better performance,and to study the effect of its catalytic conditions under visible light,has important theoretical guiding significance in environmental governance.Based on CuO,this paper studied the composite of rare earth elements Yb,Gd and Eu with CuO,systematically characterized the structural characteristics of the composite nanomaterial such as the size,morphology,element distribution,specific surface area and so on,and studied the photocatalytic performance of the material through the influencing factors of the catalyst.The concrete research content is as follows:(1)CuO nanomaterials with different morphologies were prepared by microwave-assisted hydrothermal method under the condition of NaOH addition and temperature control using CuO chloride and copper sulfate as copper sources.Study the adsorption performance of the prepared nano CuO on the simulated dye wastewater methyl orange solution and methylene blue solution,The results show that the CuO nanomaterial prepared by using copper nitrate at a temperature of 180? has the largest unit adsorption capacity,which is 88.9 mg/g.Much greater than the adsorption capacity of commercial c-CuO(8.7 mg/g).The prepared CuO was photocatalyzed to degrade methyl orange solution with trace H2O2 and visible light,and the photocatalytic degradation rate reached 99%after 3 h at pH 3.(2)Yb₂O₃/CuO,Gd₂O₃/CuO and Eu₂O₃/CuO composite photocatalysts with good crystallization and uniform morphology were obtained by using copper nitrate as the copper source and doped with three kinds of rare earth metals(ytterbium nitrate and Europium nitrate)with microwave assisted hydrothermal method and tube furnace annealing.Through a series of characterization methods of rare earth elements can be observed evenly dispersed on the surface of CuO,with the help of H₂O₂ and visible light,the photocatalytic degradation of methyl orange solution,respectively,the influencing factors of pH illumination time the amount of catalyst and the amount of H₂O₂,get different conclusions,but after doping rare earth elements can be in a wider range of cases improve the photocatalytic efficiency.The addition of rare earth elements can increase the contact surface between photocatalyst and wastewater,promote the separation of photogenerated electron pairs,and thus accelerate the photocatalytic reaction.