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Synthesis of FeTiO3 Mineral and Characteristic of Photocatalysis

Author: ShiDai
Tutor: YangHe
School: Northeastern University
Course: Environmental Science
Keywords: FeTiO3 minerals calcined methylene blue (MB) ultraviolet visible light the degradation rate
CLC: X703
Type: Master's thesis
Year: 2010
Downloads: 91
Quote: 0
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Abstract


The structure-activity relationship between the preparation, structure and photocatalytic activity of FeTiO3 minerals series catalyst were studied, Photocatalytic activity of FeTiO3 minerals series catalyst was evaluated by the degradation of MB solution. In this paper, It is profound significance for the real wastewater containing organic species in the photocatalytic mechanism of MB compound combined pollution system.Firstly, the components and microstructures of FeTiO3 minerals series catalyst were examined by XRD、SEM、UV-Vis-DRS and FTIR. Then the feasibility of many kind of FeTiO3 minerals series catalyst as photocatalysts is determined. The effects of crystalline phase, surface morphology, powder particle size, calcinations temperature on the photocatalytic activity for MB by photocatalysts were investigated. By comparing the photocatalytic activities of other kinds of photocatalysts, it can be concluded the photocatalytic activity at 1500℃of photocatalysts is the highest.The effects of the initial concentration, catalyst amount, adsorption temperature and solution pH on the adsorption efficiency for MB by the FeTiO3 minerals series catalyst adsorbents were systematically studied;and adsorption mechanism were also explored. The results showed that the adsorption data followed the Langmuir model rather than the Freundlich model, and the adsorption equilibrium was described by the Langmuir isotherm model with a macimum adsorption capacity. The thermodynamics of MB ions onto the FeTiO3 minerals series catalyst adsorbents indicates the spontaneous and endothermic nature of the adsorption process.The feasibility of photocatalytic reduction of FeTiO3 minerals series catalyst photocatalyst in MB single system was systematically studied.The UV wavelength and intensity,solution pH,acid medium,the initial concentration,catalyst life and separation efficiency were also studied. The result showed that,with the increase of light intensity,the photocatalytic reduction efficiency of MB increased;the photocatalytic reduction efficiency of MB reached maximum at pH=2;the order of the inhibitory effect of four acidic ions (PO43-,NO3-,SO42-,Cl-) on the photocatalytic reduction efficiency of MB was PO43-<no3-<so42-<Cl-;the initial concentration had a great influence on the photocatalytic reduction efficiency of MB;in accordance with the results of orthogonal test,influencing ration of the different factors was:initial concentration>catalyst dosage>pH>lighting time;the photocatalytic reduction of MB followed L-H kinetics.Compared with visible light, UV irradiation of methylene blue in water treatment in more evident, the degradation is higher. In the practical application of the treatment process,the running costs of UV radiation relatively higher;the experiment conditions is harsh; the operation is difficult; the practical significance is lower. The visible light irradiation of methylene blue water is more practical value. We can take advantage of the sun in real life as a visible light source, use of a photocatalyst for photocatalytic treatment of dying wastewater.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Wastewater treatment and utilization
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