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Electro-Catalytic Oxidation of P-Nitrophenol by Ti/Sb-SnO2 Doped with Rare Earth La Electrode

Author: LiuChunQian
Tutor: LiuWeiPing；HuangXinWen
School: Zhejiang University of Technology
Course: Environmental Engineering
Keywords: Of p-nitrophenol (p-NP) Electrocatalytic oxidation Rare earths
CLC: X703
Type: Master's thesis
Year: 2009
Downloads: 122
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Abstract


With the rapid development of modern industry and economy , water pollution has become a serious problem facing many countries , hindering the process of sustainable development of the society . Toxic , nonbiodegradable organic pollutants governance due to lack of effective treatment methods to the difficulties in the field of water treatment . The papers to the electro-catalytic oxidation technology as the core process , target pollutants nitrophenol (p-NP) , a toxic , of organic pollutants BIOREFRACTORY treatment of experimental research . By sol - gel preparation of rare earth La doped Ti / Sb-SnO 2 electrode as model substrate to p-nitrophenol (p-NP) investigated the electrocatalytic properties of the electrode preparation temperature and La content detailed experimental study to determine the appropriate preparation conditions for the heat treatment temperature of 450 ° C , La doping amount of 0.8% . Using SEM, EDS, XRD analysis were used to characterize the morphology of the electrode composition and structure . Blank electrodes and La - doped Ti / Sb-SnO 2 electrode linear sweep anodic polarization of the electrode , and investigated the blank electrode and La - doped Ti / Sb -SnO < / sub> oxygen evolution potential of the electrode ; damaged the Determination their electrode life . The results show that the La-doped Ti / Sb-SnO 2 electrode has a higher oxygen evolution potential and longer electrode life . The papers nitrophenol (p-NP) wastewater degradation factors , degradation kinetics study , the results showed that the current density , electrolyte concentration , the initial concentration of p-NP degradation effect a greater impact , p-NP degradation process follows a kinetic equation , the total reaction kinetic equation : of Ct = C0exp ( 0.6606C -0.2893 -0.2176 < / sup > M -0.1908 < / sup>. liquid chromatography and ion chromatography test results showed that the hydroxyl radical attack , nitro removal from the molecule to generate a hydroquinone , hydroquinone further role of hydroxyl radicals to form benzene quinone intermediate product, these intermediates is further oxidized to ring opening, oxidized into small molecule organic acid such as formic acid , acetic acid , etc. , and ultimately completely oxidized into carbon dioxide and water .

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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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