Preparation Of Rare Earth Nd-Eu Doped ZnO Nanomaterials And Degradation Of Rhodamine B

With the rapid development of industry,agriculture and economy,the environmental dyeing wastewater with large biotoxicity,deep color and difficult degradation is becoming more and more serious.Therefore,high-efficiency,low-energy,low-cost organic dye wastewater treatment methods have received widespread attention.In the photocatalytic degradation technology of organic dye wastewater,the preparation of degradation materials is extremely important.Photocatalytic degradation of organic dyes is a kind of water treatment technology,and the preparation of photocatalytic materials is the key of this technology.At present,some photocatalytic materials include of nano TiO₂,ZnO,WO₃ and so on has been widely studied.In this paper,is used to nano-ZnO was modied with rare earth doping direct by precipitation method.Nd-doped nano-ZnO,Eu-doped nano-ZnO,Nd/Eu-doped nano-ZnO,Eu/Nd-doped nano-ZnO was prepared,respectively.The doped ZnO were analyzed and characterized by X ray diffractometer,scanning electron microscopy and solid-state fluorescence spectroscopy.The effects of doping on the phase,crystal structure and fluorescence properties of ZnO were investigated.Meanwhile,the doped ZnO were applied to the photocatalysis of Rhodamine B in wastewater.The main research contents are as follows:Using sodium hydroxide and zinc acetate as raw materials,cetyltrimethylammonium bromide and isopropanol as auxiliary agents,the nano ZnO with smaller particle size,higher crystallinity and purity was obtained with direct precipitation method.Nd³⁺and Eu³⁺were doped into the lattice of ZnO by the same method,which affected the unit cell parameters of ZnO,increased the grain size of ZnO,and obtained spherical doped nano-ZnO particles.The degradation efficiency of Rhodamine B used Nd and Eu single-doped nano-ZnO as photocatalyst was not obvious under the irradiation of xenon lamp,but the single-doping of Nd and Eu could greatly improve the photocatalytic performance of nano-ZnO under mercury lamp irradiation.With the increase of doping amount,the photocatalytic degradation performance of doped ZnO nanomaterials increased gradually.The optimum degradation conditions of 7%Nd-doped nano-ZnO were as follows:reaction time 40 min,initial solution concentration 20 mg/L,dosage 0.02g,the removal rate of Rhodamine B was up to 89.62%.The removal rate of rhodamine B by 7%Eu-doped nano-ZnO can reach91.78%under mercury lamp irradiation.Eu-Nd/Nd-Eu Co-doped ZnO nanomaterials have high photocatalytic properties,and Eu-3%Nd and Nd-3%Eu-doped nano-ZnO have the best photocatalytic effect under xenon illumination.The removal rate of Ming B can reach 21.72%;7%Eu-7%Nd-doped nano-ZnO has the best photocatalytic effect under mercury lamp irradiation,and the removal rate of rhodamine B can reach 90.78%.The results from solid-state fluorescence spectrometer show that the photoinduced PL intensity of Nd-doped nano-ZnO,Eu-doped nano-ZnO,Nd/Eu-doped nano-ZnO and Eu/Nd-doped nano-ZnO is significantly lower than that of pure ZnO.Inhibition of recombination light-induced carriers is beneficial to the separation and transport of photogenerated carriers,thereby improving the photocatalytic activity of doped nano-ZnO.The results of this thesis show that Nd and Eu doped ZnO nanomaterials have excellent photocatalytic performance for Rhodamine B,and have broad application prospects in the treatment of organic dye wastewater.