Research On Preparation And Properties Of Titanium Doped Bismuth Ferrite

With the development of industrial society,the environmental pollution problem has become more and more serious while obtaining great economic benefits,which threatens human security and the living environment on which the biological community depends,among which organic waste water as the main cause of water pollution has been a social problem of wide concern to mankind.Photocatalytic technology,as an important mean to control water pollution,is also a hot research topic for researchers at home and abroad.BiFeO₃,as a semiconductor material with a typical perovskite structure,has the characteristics of narrow band gap,which makes it have good light response characteristics in the visible light range and potential application in the field of photocatalysis.But the low migration rate of BiFeO₃ carriers,the high combination rate of photogenerated electrons and holes,and the waste of catalysts caused by weak magnetism limit the application of BiFeO₃ in the field of photocatalysis.In order to improve the photocatalytic efficiency of BiFeO₃,it has been modified by many methods,of which metal ion doping is the most common method of change.In this paper,different titanium doping concentrations of bismuth ferrite photocatalysts are successfully prepared by sol-gel method,which has excellent photocatalytic efficiency and catalytic stability,and on this basis,the structure and performance effects of different parameters（calcination temperature,complex agent content,nitric acid content）on BiFe_0.9Ti_0.1O₃ samples are explored.（1）The sample of BiFeO₃ with different titanium doping concentrations was prepared by sol-gel method,and the sample was irregular blocky.The results showed that the BiFeO₃/Bi₂Fe₄O₉ heterogeneous structure produced during titanium doping improved the separation efficiency of photogenic carriers,and the degradation rate of BiFe_0.9Ti_0.1O₃ to rhodamine-B（Rh B）in 40min was 85%,which was 3.4 times higher than before doping.（2）Taking BiFe_0.9Ti_0.1O₃ as the research object,the effect of calcination temperature on sample structure,surface morphology and photocatalytic properties was studied.The Bi₂Fe₄O₉ phase content was moderate in samples with a calcination temperature of 650℃,and the surface of the material was relatively fluffy,showing an efficient photocatalytic efficiency,with an photocatalytic efficiency of about 90%in60min.（3）The complex agent and nitric acid content can also affect the structure and photocatalytic properties of BiFe_0.9Ti_0.1O₃ samples.The results show that when the content of no complex agent and nitric acid is 10 m L,the photocatalytic efficiency of the material is the highest,and the photocatalytic efficiency can reach more than 90%under 50 min visible light exposure.