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Electro-Catalytic Oxidation of Paranitrophenol by Fe-Doped Sb-SnO2/Ti Electrodes

Author: LuXiaoQin
Tutor: LiuWeiPing；HuangXinWen
School: Zhejiang University of Technology
Course: Environmental Engineering
Keywords: Of p-nitrophenol (p-NP) Electrocatalytic oxidation Degradation Fe doped Sb-SnO2/Ti electrode
CLC: X703
Type: Master's thesis
Year: 2009
Downloads: 183
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Abstract


In recent years, the electro-catalytic oxidation method because of refractory organic pollutants in handling biological degradation of high efficiency, no secondary pollution, caused widespread concern. The papers to the electro-catalytic oxidation technology as the core process to target pollutants nitrophenol (p-NP), experimental study of the toxic BIOREFRACTORY organic wastewater treatment. Main content of this study were prepared by sol - gel Fe-doped Sb-SnO 2 / Ti electrode using dial method to evaluate the efficiency of the electro-catalytic oxidation degradation of p-NP and impregnation prepared electrocatalytic properties of the electrode to draw dial method are prepared electrocatalytic properties of the electrode immersion method; affecting Fe doped Sb-SnO 2 / Ti electrode catalytic efficiency of the main factors: heat treatment temperature and Fe doping amount. Results show that the heat treatment temperature is 600 ℃ appropriate, the doping amount of Sn: Sb: Fe molar ratio is appropriate 1:0.02:0.0001; using a scanning electron microscope (SEM), electron spectroscopy (EDS) X-ray diffraction (XRD) Preparation of Fe-doped Sb-SnO 2 / Ti electrode characterized test preparation anodic polarization curve and the cyclic voltammograms of the linear scan, the results show the preparation of Fe-doped Miscellaneous Sb-SnO 2 / Ti electrode better than undoped Fe-Sb-SnO 2 / Ti electrode. In addition, the article also prepared Fe doped Sb-SnO 2 / Ti electrode as cathode, anode, titanium homemade glass tank were electro-catalytic oxidation of p-NP simulated wastewater Experimental Study of the degradation; systematic study of the reaction time, the influence of the initial concentration, current density, electrolyte concentration, initial pH value and other factors on the effect of the electrocatalytic oxidation of p-NP; results show that with increasing reaction time, the p- NP degradation efficiency increased, and finally flatten when degradation efficiency reached 97.2% degradation in 90 min; increase in the initial concentration will lead to a decline in the efficiency of degradation of p-NP; With the increase of the current density, p-NP degradation efficiency increase , but reached 20 mA / cm 2 , and then increase the current density will lead to the occurrence of side effects, so that the efficiency of degradation of p-NP declined. With the increase of the electrolyte concentration, the p-NP degradation efficiency increase, but when the electrolyte concentration is increased to 0.03 mol / LNa 2 SO 4 after, the degradation of organic matter to improve basic No effect; under acidic conditions, the highest p-NP degradation efficiency. Finalize the Fe-doped Sb-SnO 2 / Yi for the anode degradation of p-NP optimum conditions is the reaction time of 90 min, the electrolyte concentration of 0.03 mol / LNa 2 SO 4 , the current density of 20 mA / cm 2 ; initial concentration, current density, electrolyte concentration, initial pH value and other factors on the p-NP electrocatalytic oxidation degradation kinetics of dynamic analysis, the results show that the electro-catalytic oxidation degradation of p-NP order kinetics characteristics. Liquid chromatography and ion chromatography test results show that under the attack of hydroxyl radicals, nitro generated hydroquinone, hydroquinone under the action of hydroxyl radicals to further generate some of the intermediate product, and the removal from the molecule, These intermediates are further oxidized by ring-opening oxidation into a small molecular organic acid such as formic acid, acetic acid, etc., and eventually 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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