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

Study on the Synthesis of Perovskite Oxides and the Photocatalytic Degradation of Acid Red B

Author XuYongQuan
Tutor WangYanJi;WangGuiYun
School Hebei University of Technology
Course Chemical processes
Keywords Photocatalytic Oxidation Acid Red B Perovskite Degradation Active
CLC O643.3
Type Master's thesis
Year 2004
Downloads 248
Quotes 2
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Perovskite type oxide (the the ABO 3 ) not only has structural stability, and high catalytic activity, and can be prepared by changing the types of atoms of the A, B, the forbidden band width is narrow, can absorb a lot of sunlight catalyst. A, B of nitrate as the raw material, ammonia or sodium carbonate as the precipitating agent, a series of perovskite-type oxide was synthesized using the method of mixed precipitation. A is selected from alkaline earth metal elements Mg, Ca, Sr, Ba, and the rare earth element La; B selected transition metal elements Cr, Mn, Fe, Co., Ni, etc.. The activity tests showed that the influence of A is relatively small, the influence of B is more significant, the total change trend is that as the atomic number of B increases, the improvement of the photocatalytic activity. In all of the above-mentioned catalyst CaNiO 3 highest catalytic activity, XRD, and TEM test results show that the synthesized CaNiO 3 of high purity and particle size of 150 ~ 200nm near spherical particles. Comparison test CaNiO 3 and TiO 2 of the photocatalytic activity, the results showed that, under UV irradiation of both active considerable; the former high activity under simulated sunlight in the latter, Acid Red B degradation rate of 63% and 47%, respectively. Synthesized CaFexNi 1-X O 3 (x = 0.1 ~ 0.9) type composite oxide catalyst, wherein the CaFe 0.3 Ni 0.7 O 3 Acid Red B under the simulated sunlight irradiation degradation rate can reach 91%. Co, Ag load further study of the the CaFe 0.3 Ni 0.7 O 3 photocatalytic activity, results supported Co activity dropped significantly AG so that the active and the load is increased to more than 96%. Under UV irradiation to CaNiO 3 catalyst, the kinetic behavior of photocatalytic degradation of Acid Red B. Determine reaction order of 1.4, the pre-exponential factor: 1.01 × 10 7 mol -0.4 L 0.4 min - (-1), the activation energy Ea: 35.5 kJ · mol -1 . On different time degradation of Acid Red B infrared and UV - visible spectroscopy and speculated that the mechanism of degradation of Acid Red B, according to the analysis results. The first is an azo the disappearance of the double bond, followed by the fracture of the naphthalene ring, and benzene ring-opening. The process conditions photocatalytic degradation of Acid Red B: H 2 O 2 improvement of photocatalytic activity in wastewater solution, and with the increase of the amount of. The great growth trends; increase the acidity of the solution is conducive to the degradation of dye wastewater; higher the concentration of acidic red B wastewater solution of initial photocatalytic the harder degradation.

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