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Study on the Influence of Doping on the Photocatalytic Activity of Perovskite-Type Oxides ABO3

Author: CuiJinJin
Tutor: YangQiuHua
School: Tianjin University
Course: Physical and chemical
Keywords: Perovskite-type composite oxide Photocatalytic Activity Doping Oxygen vacancy
CLC: O643.36
Type: Master's thesis
Year: 2007
Downloads: 207
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Abstract


In this paper, the citric acid legally prepared a series of the ABO 3 perovskite-type composite oxide the press different proportions the synthesis AABO 3 and ABBO < / sub > series doped samples , determined by XRD analysis with the spatial configuration of the perovskite . Means of TG-DTA thermal analysis , combined IR and XRD analysis results , and draw citric prepared the mechanism of formation of the perovskite -type oxides : 450W fluorescent mercury LaMnO 3 lamp as the light source , water-soluble dyes such as Acid Red 3B Photocatalytic Degradation and decolorization rate of photocatalytic activity of the series of samples were characterized , and thus the use of the SEM, TEM, IR, UV-Vis, photoacoustic spectroscopy , XPS and other technology analyzes the photocatalytic activity of the catalyst and its influencing factors . The study showed that: the constituent elements (A, B) Allred-Rochow electricity negative increase and 3d electrons increase the number of the B ion , B 3 DO 2 p between energy gap is reduced, i.e. the light absorption threshold of the semiconductor decreases, can be improved and a corresponding increase in the photocatalytic activity to visible utilization ; doping of a trace amount of the photocatalytic activity can be markedly improved , the reason is the introduction of the expanding photoresponsive segment Board domain level, while increasing the number of oxygen vacancies , thereby increasing the content of the catalyst surface adsorbed oxygen so that the enhanced activity of the catalyst , but when the doping amount is gradually increased , there will be oxygen vacancies partially ordered arrangement , and the activity of the catalyst is contrary will be reduced, and therefore there is an optimum doping ratio .

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CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Chemical kinetics,catalysis > Catalytic > Catalyst
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