Electrocatalytic Oxidation Of Phenacetin By Three - Dimensional Particle Electrode

Three-dimensional electrode method is being a promising water treatment technology in recent years. It has the advantages of high treatment efficiency, low energy consumption, complete degradation of pollutants, no secondary pollution and so on. It is one of the hot spot of current research. The degradation organics process of three-dimensional electrode reactor is complex, so its degradation mechanism is still inconclusive.In recent years, researchers keep the continuous focus on pharmaceutical and personal care products (PPCPs) pollution to the environment. Phenacetin is the typical pollution of PPCPs. Phenacetin has strong toxicity to the environment and difficult to be degraded by biological treatment.The present did the research that the three-dimensional electrode reactor degrade phenacetin. Experiments use graphite electrode as cathode and anode, A/B as the particle electrodes to treat phenacetin simulated wastewater. The research revealed the phenacetin electrochemical oxidation mechanism, detected the phenacetin degradation intermediate and speculated its degradation pathways, explored the optimum techno logical conditions of three-dimensional electrode reactor.The paper put forward a degradation mechanism of three-dimensional electrode reactor. The degradation mechanism combines direct electrochemical oxidation and indirect electrochemical oxidation which work together to degrade organics. The analysis results indicates that in the process, the reaction of bond breaking in branch chains results from direct oxidation, and the reaction of aromatic ring cleavage results from attack by hydroxyl radicals which originated from indirect oxidation. The addition of oxygen can make electrochemical oxidation be improved.By the means of ultra performance liquid chromatography-mass spectrometry instrument, the experiment analysis 9 degradation intermediates and speculated two possible phenacetin degradation pathways.The paper do a research that the effect of current density, initial PH, air impact on COD removal rate on three-dimensional electrode reactor treating simulated phenacetin wastewater. Under the condition of optimum parameters which current density is 10mA/cm2, initial pH is 5 and air is 0.2m3/h. with 4h wastewater electrochemical oxidation, the COD removal rate can reach 73.4%.