Degradation Treatment of Salicylic Acid by Photo-assisted Electrochemical Method
Date Issued
2009
Date
2009
Author(s)
Chen, Ting-Yueh
Abstract
Advanced oxidation process is the best method for wastewater treatment. According to different classification of reaction mechanisms, Fenton process and photocatalytic reaction have most widely applications. In this study, photocatalytic reaction was combined with Fenton process. Titanium dioxide thin film electrode is used to be the anode, and photoelectrons on TiO2 surface will be irradiated by UV light and then transit to the conductive band to move to cathode to reduce oxygen in the cathode. When the reduction reaction occurred, hydrogen peroxide was produced and it diffused to the system to react with ferrous ion in the solution, which is called Fenton process. As the whole reaction process continued to be irradiated by UV light, the reaction mechanism contains the photo-Fenton process. In this way, ferriciron ions will e reduced to ferrous ions, and the organism will be decomposed completely. Titanium dioxide thin film electrode was prepared by sol-gel method. The surface morphology was developed by SEM. We also analyzed crystal structure by XRD and made use of Debye-Scherrer equation to calculate the particle size of Titanium dioxide. Adsorption and bonding way with oxygen atoms between Titanium dioxide thin film and ITO glass were developed by XPS analysis. Absorbance data was obtained by UV-vis analysis and the energy gap was estimated. Finally, the I-V curve showed the photocurrent effect when a positive voltage was added to the system. Salicylic acid generated much wastewater because of its popular applications of medical treatment and synthetic industry. We chose 0.05mM Salicylic acid as the organic pollutant and proceeded a degradation reaction. Reaction systems are AT_CC, AT_CC_Fe2+ and AT_CC_Fe3+, which the best one is AT_CC_Fe2+. Then we discussed some factors and how they affect the systems which were mentioned above. The factors, for example, are the initial pH value, the concentration of Fe2+, light intensity, and the flux of feeding oxygen. Finally, the relationship between extra added current and reaction system was discussed.
Subjects
Advanced oxidation process
photocatalytic reaction
Fenton process
photo-Fenton process
Titanium dioxide thin film
redox
Type
thesis
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