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Degradation of Alachlor by Dye-Sensitized TiO2/Ti Photoelectrode

Author: LiuChunHui
Tutor: LiuHuiLing
School: Harbin Institute of Technology
Course: Environmental Science and Engineering
Keywords: TiO2 Photosensitization Visible light Photoelectrocatalysis Alachlor
CLC: X703.1
Type: Master's thesis
Year: 2008
Downloads: 21
Quote: 0
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Abstract


TiO2 photocatalytic oxidation technology due to its outstanding advantages of low energy consumption, mild reaction conditions, simple operation, and can reduce secondary pollution increasing attention. However, due to the band gap of TiO2 can be larger (3.2eV), only in the larger energy under UV irradiation in order to exhibit a photocatalytic activity. Ultraviolet light in sunlight, the proportion of small and attenuation in the waters spread quickly, making the light use efficiency is very low, in addition, the photo-generated electron-hole recombination probability higher, so that the light quantum yield than is low. These negative factors were the TiO2 photocatalytic technology is limited in the practical application of water treatment. In this thesis, the problem of low utilization of sunlight for TiO2 catalyst, raised the photosensitizing dye the surface of small organic molecules the to extremely modified envisaged to photoelectric TiO2/Ti. The method of using a new preparation of the modified electrode: the anodizing method prepared pure TiO2/Ti photoelectric extremely substrate, polyvinyl alcohol as a film-forming agent, obtained by adding a certain volume concentration of the dye solution in the film-forming agent system composite film agents, using the dip-coating method of film deposition on the substrate surface. Of Rhodamine B as a target substance for photocatalytic oxidation, photosensitizing dye surface modified electrodes prepared dye species, the volume concentration of doping, the concentration of the film-forming agent, a film-forming agent with the dye solution, such as the ratio of process conditions optimization obtained in visible light reactive yellow surface of the catalytic properties of high light (electric) the photosensitizing light modified photoelectrode and methylene blue surface of the photosensitive modified photoelectrode. In this thesis, the active yellow photosensitive surface modified photoelectrode Photoelectric catalytic degradation of alachlor solution in the visible light. Optimized process conditions the degradation process alachlor photoelectrocatalysis the bias, the initial solution pH value and the initial solution concentration. The preliminary results show that the reaction kinetics of alachlor solution, of alachlor solution photoelectric catalytic oxidation obeyed the pseudo-first-order reaction kinetics. In addition, for some of the drawbacks of the photoelectric catalytic oxidation reactor, the improvement program, design and development of a new reactor. Reactor in comparative experiments show that the improved new reactor for the processing of the target material, in terms of the equivalent amount of processing and the equivalent processing efficiency has greatly improved, increased 56-fold and 7.4-fold, respectively.

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