Preparation And Photocatalytic Properties Of Nano - Bi - Bi - 2 O ₂ 3

As a new type of photocatalytic semiconductor materials, Bi2O2CO3photocatalyst exhibits excellent photocalytic activity due to the appropriate band gap and the layered structure. As a kind of Aurivillius type, Bi2O2CO3photocatalyst has a layer structure of [Bi2O2]2-layers inter leaved by slabs comprising CO32-. Therefore, Bi2O2CO3photocatalyst expresses the excellent performance in the photocatalytic oxidation and reduction, and has a promising future in the photolysis of water and the degradation of organic pollutants. Bi2O2CO3photocatalyst has been studied extensively and deeply by the many researchers. The main purpose of the research is to make the different morphologies Bi2O2CO3and to discuss the photocatalytic performance and to analysis the influence of temperature to the the photocatalytic performance.1) In the room temperature, β-Bi2O3that is unstable in the solution absorbed CO2in the air as the carbon resource and transformed into Bi2O2CO3. Bi2O2CO3was transformed from the intermediate product (BiO)4(OH)2CO3. The use of various characterization methods including XRD, SEM, FT-IR, UV-vis etc determined the crystal phase, the morphology and the band width of the Bi2O2CO3photocatalyst. Sheet structure of Bi2O2CO3exhibited the good photocatalytic activity in the degradation of organic dyes include rhodamine B in the ultraviolet light or the visible light(≥420run). Through heat treating experiment, temperature was an important affection on the photocatalytic performance of Bi2O2CO3.2) In the condition of surfactant, the Bi2O2CO3microspheres were prepared by using Bi(NO3)3and Na2CO3as the raw resource. The use of various characterization methods including XRD, SEM, UV-vis etc determined the crystal phase, the morphology and the band width of Bi2O2CO3microspheres. Bi2O2CO3microspheres exhibited the good photocatalytic activity in the degradation of organic dyes include Rhodamine B and Methyl orange in the ultraviolet light or the visible light.3) Bi2O2CO3microspheres transformed into bismuth oxide in the high temperature. The use of various characterization methods including XRD, SEM, UV-vis etc showed that the composition varied from Bi2O2CO3to Bi2O3, that the morphology varied from the microspheres to flocculent structure and that the absorption edge of Bi2O2CO3microspheres changed from the ultraviolet to the visible light with the increase of temperature. The photocurrent of Bi2O2CO3was positive in the ultraviolet. The photocurrent was negative with the increase of the temperature. It had the larger current when the heated temperature was400℃. The degree of the photocurrent determined the photocatalytic performance of Bi2O2CO3. The results is in accordance with the results of the oxidation of NO gas. Therefore, the temperature has a significant influence on the photocatalytic performance of/bi2O2CO3.