Electrochemical Oxidation Degradation Of Methyl Orange And Electrochemical Condensation Of Acetone

With the development of economic, various organic pollutants, which originate from industry, agriculture and urban development, are very difficult to be degraded. Therefore, the primary problem is to find an effective way to degrade the organic pollutants. Electrochemical oxidation degradation process is simple, high efficient and green. Copper oxide can efficiently catalyze the degradation of organic pollutants. Based on these, the main work of the first part in this paper is as follows:(1) The porous titanium electrode was used as the electrode substrate. Ti/Cu/Cu2O/CuO electrode was prepared by electroplating method and thermal oxidation. The obtained electrodes were characterized by LSV, XRD and SEM and the results showed the high oxygen evolution potential, the components of copper and the surface appearance of the electrodes.(2) The Ti/Cu/Cu2O/CuO electrode was used to degrade the methyl orange wastewater in self-assembly H-type electro-chemistry three-electrode system reaction vessel [with Ti/Cu/Cu2O/CuO electrode (25mm*25mm*1mm) as a working electrode, graphite electrode (25mm*25mm*3mm) as the counter electrode, saturated calomel electrode as reference electrode] at25℃under oxygen atmosphere with the sodium sulfate as support electrolyte. The effects of some electrode preparation and electro-oxidation conditions on the degradation rate of methyl orange were investigated in details. The results showed that when the Ti/Cu/Cu2O/CuO, which was prepared by use of the copper plating time for20min, the calcination temperature for300℃and the calcination time for3h, was employed as a working electrode, the degradation rate of methyl orange could reached91.4%under the optimal reaction conditons (methyl orange solution concentration,200mg/L, supporting electrolyte NaNO3solution concentration,0.1mol/L, anodic potential,1.5V and the degradation time,3h).As the self condensation of acetone, diacetone alcohol is not only an important medium boiling solvent but also an important organic synthetic raw material and intermediates. The main synthesis method of diacetone alcohol is the base-catalyzed chemical synthesis method. Based on this, the main work of the second part in this paper is as follows:Using the self-assembly H-type electro-chemistry three-electrode device as reaction vessel [with graphite electrodes (25mm*25mm*3mm) as working electrode and the counter electrode, saturated calomel electrode as reference electrode] and sodium nitrate as the supporting electrolyte, the diacetone alcohol was prepared under certain conditions. The effects of various parameters on the electrochemical condensation of acetone were investigated in details. Under the optimized conditions, the conversion rate of acetone reached14.6%and the selectivity of diacetone alcohol was99.6%.