Study On Synthesis And Photocatalytic Activity Of Visible Light Responsive Bismuth Complex Oxides Nanocrystals

Dyes are important organic pollutants, and their release as wastewater in the ecosystem is a dramaticsource of esthetic pollution, eutrophication, and perturbations in aquatic life.Organic pollutants degradationby utilization of solar energy have vital significance for solving the energy crisis and environmentalproblems. Developing visible light responding photocatalysts is the key for sunlight efficiently utilization.So the research on the photocatalysts under visible light has been one of the most important issues incatalyst research.Our work is based on the research achievements and current situation of the photocatalysts,we had preparaed several visible light responding photocatalysts.This dissertation includes four parts:1. The Bi₂₄Al₂O₃₉nanoparticles had been prepared by gel-network combustion method. The productwas characterized by XRD,TG-DTA, SEM and Ultraviolet obvious spectrum（UV-Vis）.And thephotocatalytic activity of Bi₂₄Al₂O₃₉crystallites had been evaluated by using the photocatalytic oxidationreaction of rhodamine B（RhB）.The optimal preparation condition of Bi₂₄Al₂O₃₉nznopartides was:thereactents propotion of glutin dosage is X=0.83,and the calcination temperature is600℃,the RhBphotodegradation in the presence Bi₂₄Al₂O₃₉crystallites prepared obtained Under this condition is feasibleand nearly100%of the dye was bleached after30min under ultraviolet irradiation,and about98%of thedye was bleached after160min under visible light irradiation.2.The Bi₂₄Al₂O₃₉nanoparticles had been prepared by gel-network precipitation method,The productwas characterized by XRD, TG-DSC, SEM and Ultraviolet obvious spectrum （UV-Vis）and the effects oftwo factors such as calcination temperature and the glution dosage on the diameter and phtocatalytic ofnanoparticles had been studied. The photocatalytic reactivity was evaluated by the degradation of reactive RhB at the room temperature.The optimal preparation condition of Bi₂₄Al₂O₃₉nanoparticles was:thereactents propotion of glutin dosage is0.83,and the calcination temperature is600℃, the RhBphotodegradation in the presence Bi₂₄Al₂O₃₉crystallites prepared obtained under this condition is feasibleand nearly100%of the dye was bleached after30min under ultraviolet irradiation,and about99%of thedye was bleached after160min under visible light irradiation.3.The Bi₁₂In_0.5O_18.75nanoparticles had been prepared by gel-network combustion method,Theproduct was characterized by XRD, TG-DSC, SEM and Ultraviolet obvious spectrum （UV-Vis）.And thephotocatalytic activity of Bi₁₂In_0.5O_18.75crystallites had been evaluated by using the photocatalyticoxidation reaction of rhodamine B（RhB）.The optimal preparation condition of Indium Bismuthnznopartides was:the reactents propotion of glutin dosage is X=0.83,and the calcination temperature is500℃，the RhB photodegradation in the presence Bi₁₂In_0.5O_18.75crystallites prepared obtained under thiscondition is feasible and nearly100%of the dye was bleached after20min under ultraviolet irradiation,andabout98%of the dye was bleached after160min under visible light irradiation.4.The Bi₂₅GaO₄₀nanoparticles had been prepared by gel-network combustion method.The productwas characterized by XRD, TG-DSC, SEM and Ultraviolet obvious spectrum （UV-Vis）.The photocatalyticreactivity was evaluated by the degradation of reactive RhB at the room temperature.The optimalpreparation condition of Bismuth gallate nanoparticles was:the reactents propotion of glutin dosage isX=0.83, and the calcination temperature is700℃，the rhB photodegradation in the presence Bi₂₅GaO₄₀crystallites prepared obtained Under this condition is feasible and nearly99%of the dye was bleached after30min under ultraviolet irradiation,and about98%of the dye was bleached after160min under visible lightirradiation.