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Photoelectrocatalytic Activity of TiO2 Using Microarc Oxidation

Author: DuHongLei
Tutor: SuHuiDong
School: Shenyang University of Technology
Course: Environmental Engineering
Keywords: photoelectrocatalysis MAO three-dimensional electrode TiO2
CLC: X703
Type: Master's thesis
Year: 2011
Downloads: 94
Quote: 2
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Abstract


In this paper, filling with catalysis of particle electrode composed of three dimensional electrode system. TiO2 was loaded with the GAC andγ-Al2O3 by sol-gel method, combining with regulated power supply make up the three-dimensional electrode photoelectrocatalysis system.Titanium oxide coatings （TiO2/Ti） were formed on the titanium surface by micro-arc oxidation （MAO） in Na3PO4 solution with the concentration of 8g/L. And using the TiO2/Ti as anod electrode（ micro-arc oxidation time is 5min）, the titanium as counter electrode in the system of three-dimensional electrode. The photoelectrocatalysis system use Na2SO4 aqueous solution as supporting electrolyte, and UV lamp （20W,λ=253.7nm） as the illuminant. The photoelectrocatalytic ability of titanium oxide coatings were evaluated by photoelectrocatalytic degradation of methylthionine chloride aqueous solution. In the sol-gel method, using tetrabutyl titanate as precursor, alcohol as solvent, and HCl as catalyst. After heat treatment, TiO2/GAC and TiO2/γ-Al2O3 were the loading-particle electrode.In this paper, there’s some influence factors had been studied about photoelectrocatalysis degradation of methylthionine chloride simulate dye wastewater. Such as particle electrode calcining temperature, load membrane layer, particle ratio, power supply voltage, initial concentration of methylene blue solution, Na2SO4 electrolyte solution concentration, electrode gap and so on. There are the conclusions: （1）Under the best experiment condition, the system have the best efficiency, with the degradation of 75.32% after 3 hours. This three-dimension electrode system filling with GAC and the GAC /TiO2 mixed particles have the high-efficiency degradation. System of main electrode TiO2/Ti nets and GAC/TiO2 electrodes all happened photocatalysis under the uv irradiation. TiO2/GAC and GAC electrodes have the big adsorption property, and that increase the photocatalysis property, under the action of an external voltage, the system occurred electrochemical reactions.Moreover, doping rare-earth element to TiO2/GAC can improve the photoelectrocatalysis activity for it’s restrained the growing of crystalline grain. Experiments show that doped Eu catalytic having the best result.（2） Under the best experiment condition, the system have the best efficiency, with the degradation of 60.39% after 3 hours. This three-dimension electrode system filling with globular TiO2/γ-Al2O3 and scrap iron mixed particles have the high-efficiency degradation. When the globular TiO2/γ-Al2O3 and scrap iron particles as the third electrod, the reaction system of methylene blue degradation rates was promoted. The TiO2/γ-Al2O3 particles have the photocatalytic activity, and then the photocatalytic activity increased obviously after mixed with scrap iron, And it acting as an insulator increase the scrap iron electrocatalysis role. Moreover, scrap iron within the role of electrolysis, and that generate Fenton reagents in the Fenton reaction. Further accelerate the speed of adsorption and degradation of organic pollutants.（3） Under the best experiment condition, the system have the best efficiency, with the degradation of 76.17% after 3 hours. This three-dimension electrode system filling with granule TiO2/γ-Al2O3 and scrap iron mixed particles have the high-efficiency degradation. Comparing with the second system, filling material is extremely similar, reaction is also similar. The difference is the properties have been improved after crush about granule TiO2/γ-Al2O3 and globular TiO2/γ-Al2O3, And its size and scrap iron size similar, thus scrap iron and granule TiO2/γ-Al2O3 particles fully mixing, so it improve the complex three-dimension electrode photoelectric catalytic efficiency.（4） Under the best experiment condition, the system have the best efficiency, with the degradation of 72.48% after 3 hours. This three-dimension electrode system filling with granule TiO2/γ-Al2O3 and GAC mixed particles have the high-efficiency degradation. Particles mixing fully, polarity together constitute complex three-dimension electrode system. Thus forming photoelectric coordination reaction system, improve the system of three-dimension photoelectric catalytic efficiency.After the analysis of these systems, TiO2 photoelectrocatalysis efficiency has improved obviously with the three-dimensional electrode. MAO-TiO2/Ti and loading TiO2 have the photocatalysis performance under the irradiation of UV, and the synergistic effect of them obviously. The three-dimensional electrode photoelectrocatalysis degradation of methylene blue increase thoroughly, comparing to traditional two-dimensional plate electrodes which without particle electrode.

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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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