Preparation Of Bismuth Oxide Based Semiconductor Composites And Their Performance For Aureomycin Removal

The widespread use of antibiotics not only brings benefits to human beings,but also destroys the ecological environment.Especially,the continuous enhancement of antibiotic resistance makes the problem of water pollution control more serious.Adsorption method and advanced oxidation method are commonly used in water pollution treatment,but the combination of two method is rarely reported.In this academic dissertation,bismuth oxide as the research object,through the construction of composite material,make the removal efficiency of aureomycin by single material was improved.The specific research content is as follows:(1)Bi₂O₃/CeO₂/Ce₁₁O₂₀composite was synthesized by two-step solvothermal method.On the one hand,the specific surface area of Bi₂O₃and CeO₂were improved to improve their adsorption performance.On the other hand,the photodegradation of Bi₂O₃and CeO₂can be improved by improving their photo-response ability.The BC-2(n _Bi:n _Ce=2:1)composite has the best adsorption and degradation performance in the removal of aureomycin(20 mg/L).The adsorption efficiency of aureomycin within 60 min is 56%,which is 2.3 and 4.6 times that of Bi₂O₃(24%)and CeO₂(12%),respectively.The degradation efficiency of aureomycin in 150 min was 69%,which was 10%and 15%higher than that of Bi₂O₃(59%)and CeO₂(54%),respectively.In addition,the optimal removal conditions were found through a series of experiments.(2)Flower-like Bi₂O₃/Bi₂O₂CO₃microsphere were successfully prepared by solvothermal method and calcination method,and the photocatalytic hydrogel was further prepared by gel method.On the one hand,by improving the specific surface area of Bi₂O₃and Bi₂O₂CO₃,the adsorption performance of the composite material is improved.On the other hand,the photodegradation of Bi₂O₃and Bi₂O₂CO₃can be improved by improving the photo-response of Bi₂O₃and Bi₂O₂CO₃.BB-3(Bi₂O₃/Bi₂O₂CO₃-320?)composite showed the best removal efficiency in aureomycin(70 mg/L)removal experiment.The adsorption efficiency of aureomycin within 60 min is 49%,which is 1.50 and 1.63 times of Bi₂O₃(32%)and Bi₂O₂CO₃(30%),respectively.Under visible light irradiation,the degradation efficiency of aureomycin reaches 63%within 60 min,which is 23%and 30%higher than That of Bi₂O₃(40%)and Bi₂O₂CO₃(33%),respectively.In addition,the best removal conditions of the material were found through a series of experiments.