Pd, Ru / Ti Catalytic Electrode Ultrasonic Electro-catalytic Degradation Of Phenol In Wastewater

With the high-speed developing in industry, the quantity of organic wastewater is increasing year after year. At the same time, the kind of organic contaminants is more and more. It is expensive and inefficient with the general method in phenol. A new method that ultrasound associated with electrolysis on the degradation of phenol in wastewater by Pd, Ru catalytic electrode is selected. Our experiments have proved that it is an effective method in the degradation of phenol.In this paper, we prepared three electrodes in the same way that high temperature oxidation with coated by Pd, Ru, and studied their catalytic performance in the different experiment conditions of cell voltage, pH value and reaction time etc. The results showed that the catalytic performance of Pd, Ru catalytic electrode was best. With pH value 5, cell voltage 25 V, electrolyte concentration 0.718 mg/mL and reaction time 60 minutes etc. Optimization, the degradation of phenol can reach 90%, and COD removal is 77%.In this paper, the surface structure of Pd, Ru catalytic electrode is analyzed with SEM and XPS. Effect of cell voltage, pH value and reaction time etc. in the different experiment conditions with ultrasonic and electrical catalytic degradation of phenol by Pd, Ru catalytic electrode was investigated. The results showed that the degradation of phenol can reach 100%, and COD removal is 90% in this way with pH value 5, cell voltage 25 V, electrolyte concentration 0.718 mg/mL, reaction time 60 minutes, initial concentration 100mg/L, initial COD 253 mg/L and space between two electrodes 8 mm-10 mm etc.In the end, we discussed the elementary mechanism of the degradation ofphenol with ultrasonic and electrical catalyzed oxidation by Pd, Ru catalytic electrode. We think that ultrasonic can accelerate electrochemistry reaction greatly. There are two actions in the ultrasonic and electrical catalytic system: phenol can be decomposed by in the cavitation bubble, or oxidized by radicals produced sound cavitation; Oxygen from the. OH radical on the electrode surface to crystal lattice of metal oxide can oxidize phenol in aqueous solution.