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High performance SnO_2 electrode preparation , characterization and application of

Author: YaoPeiDong
Tutor: WangDaLi
School: Zhejiang University
Course: Environmental Engineering
Keywords: Chemical vapor deposition Ultrasonic spray pyrolysis Ti/SnO2 Ti/SnO2-Sb Ti/SnO2-Sb-Mn Ti/SnO2-Sb-Ce Electrocatalytic oxidation Biochemical Anode Pollutants Wastewater treatment Phenol Orange Ⅱ Methyl orange
CLC: X703
Type: PhD thesis
Year: 2009
Downloads: 332
Quote: 1
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Abstract


Past two decades, more and more electro-catalytic oxidation technology environment the attention of scholars at home and abroad. Due to electro-catalytic oxidation technology has wide adaptability, oxidation resistance, no secondary pollution, rapid response, equipment and its simple operation and becoming refractory organic wastewater treatment research focus. Electrocatalytic oxidation of the anode material is the core, which determines the electrocatalytic oxidation of organic pollutants in the reaction mechanism and the current efficiency. The anode material is generally desired to be met: good conductivity; stability; higher electrocatalytic activity conditions. However, there is lack of good anode materials to meet the needs of electro-catalytic oxidation technology, which greatly limits the electrochemical oxidation technology industrial application. Therefore, efficient and inexpensive anode material is the development of the field of electro-catalytic oxidation of research focus. This thesis aims to develop electro-catalytic oxidation technology for high-performance SnO 2 anode material. The main research work consists of three parts: SnO 2 electrode preparation to explore new ways; New Sb-Ce doped SnO 2 Electrode, characterization and application; New Sb-Mn doped SnO 2 Electrode, characterization and application. Successful development of the ultrasonic spray pyrolysis titanium matrix doped SnO 2 electrodes new technologies. The results show that not only can the ultrasonic spray pyrolysis doped SnO 2 uniform and stable film deposited on titanium base, but also easy to control deposition conditions, precursor easy to choose, the resulting electrochemical performance and easy control. In SbCl 3 and SnCl 4 hydrochloric acid solution as a precursor by ultrasonic spray pyrolysis success Sb-doped titanium matrix was prepared SnO 2 electrodes (Ti / SnO 2 -Sb). Under the same conditions, the degradation of phenol electrode current efficiency than the conventional method were Ti / SnO 2 -Sb electrode increased 20-28%. By ultrasonic spray pyrolysis successfully prepared a new titanium-based Sb-Ce doped SnO 2 electrode (Ti / SnO 2 -Sb-Ce). The electrodes for electrochemical degradation, to be effective in refractory organic wastewater contaminants into CO 2 , H 2 O and other simple inorganic substances. Physical and chemical characterization show, Ce-doped oxide film can significantly optimize the microstructure and improve the electrode surface area, improving the cyclic voltammetry. Comparative experiments show that Ti / SnO 2 -Sb electrode compared, Ti / SnO 2 -Sb-Ce electrode degradation of Orange Ⅱ current efficiency increased by 22%, which could consumption decreased by 21%. By ultrasonic spray pyrolysis also successfully prepared a new titanium-based Sb-Mn doped SnO 2 electrode (Ti / SnO 2 -Sb-Mn). The electrode is suitable for refractory organic wastewater pretreatment electrochemical conversion, improve wastewater biodegradability. Physical and chemical characterization shows, Mn solid solution oxide film doped manner, the electrode surface significantly improved microstructure and cyclic voltammetry. Electrochemical conversion experiments show, Ti / SnO 2 -Sb-Mn electrode can significantly improve wastewater and methyl orange Orange Ⅱ biodegradability, so that BOD 5 and COD The ratio of 0.01 and 0.07 respectively increased to 0.25 and 0.30.

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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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