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TiO_2 Photocatalytic degradation of organic pollutants and their behavior with electronic

Author: ZengFanYin
Tutor: LiMingYu
School: Jinan University
Course: Environmental Engineering
Keywords: TiO2 Photoelectrocatalysis Indirect oxidation Methylene blue
CLC: X703
Type: Master's thesis
Year: 2011
Downloads: 115
Quote: 3
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Abstract


As photoelectrocatalysis can effectively make the photo-generated electron - hole pairs are separated, has aroused widespread concern. Currently, photoelectrocatalysis study, people in the TiO2 anodic oxidation of organic pollutants has done a lot of research, and the light generated electron reduction of oxygen, using the generated active oxygen to degrade organic pollutants less. In addition, the photo-generated electron reduction of oxygen at the surface of TiO2 catalysts played an indirect oxidation has not been confirmed. In order to further improve the photocatalytic efficiency and research photoinduced electron reduction of oxygen behavior, this paper do the following research: using cyclic voltammetry and square wave voltammetry cycle analysis of O2 and H at TiO2/Ti electrode reduction reaction. From the cyclic voltammograms and cyclic square wave voltammetry figure, you can clearly see the two pairs of redox peaks. The results showed that: in acidic conditions, a reduction peak potential in the first place, in the main reaction of H. Mainly in alkaline conditions in the reaction O2: reduction peak potential in the second place, in acidic conditions is H occurs mainly of hydrogen generated is reduced reaction occurs under alkaline conditions in the main reaction is the reduction of Ti4 reaction. In place of the H TiO2/Ti type of reduction reaction results show that: under acidic conditions, two reduction peaks occurring at the reduction reaction of H are controlled by diffusion. In addition, the use of steady-state voltammetry of H2O2 in TiO2/Ti reduction reaction, the results showed that: hydrogen peroxide can occur TiO2/Ti single electron reduction electrode reacts with strong oxidizing hydroxyl radicals · OH. With two electrodes for the optical TiO2/Ti catalytic cathode and anode reactor constructed the new \degradation experiments. Methylene blue degradation results show that, TiO2 conduction band electrons can restore oxygen generated with strong oxidizing substances, can effectively degradation of methylene blue and TiO2/Ti cathode for degradation of organic matter is better than graphite as a cathode when methylene blue degradation. Methylene blue in TiO2/Ti cathode is indirect oxidation, degradation and its effects on the anode in TiO2/Ti photoelectric light degradation effect is quite. This study shows that in the novel \In addition, TiO2 conduction band electron reduction of oxygen to generate active substances with enhanced also be confirmed.

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