超重力场中RuO2-IrO2-SnO2/Ti阳极电催化降解含酚废水

Phenol Wastewater Degradation by Electrocatalytic Method with RuO2-IrO2-SnO2/Ti Anode in the High Gravity Field

A novel high gravity multi-concentric cylinder electrodes-rotating bed(MCCE-RB) was used in the electrocatalytic degradation of phenol wastewater with self-made RuO2-IrO2-SnO2/Ti as the anode, stainless steel as the cathode. The influences of current density, inlet liquid circulation flowrate, high gravity factor, sodium chloride concentration and initial pH value on degradation efficiencies were investigated and the optimal operating conditions were determined. The results showed that under the optimal conditions of current density of 35 mA/cm2, inlet liquid circulation flowrate of 48 L/h, high gravity factor of 20, sodium chloride concentration of 8.5 g/L, initial pH value of 6.5, reaction time of 100 min, the phenol initial concentration of 500 mg/L, the removal efficiency of phenol reached 99.7%, which was improved 10.4% than that in the normal gravity field under the optimal conditions. The tendency of removal efficiencies of phenol, total organic carbon (TOC) and chemical oxygen demand (COD) over time were studied. The intermediate products and degradation pathway of phenol were deduced by high performance liquid chromatography (HPLC).