ELECTROCATALYTIC DEGRADATION OF PHENOL IN ACIDIC AND SALINE WASTEWATER

摘要

The electrocatalytic degradation of low concentration of phenol (100 - 800 mg L~(-1)) as a model contaminant for wastewater treatment was studied on modified β-PbO_2 anode. Various affected factors such as current density (7.5-30 mA cm~(-2)), reaction temperature (5-60 ℃), pH (2-6) and salinity of the electrolyte (0.5-10 g L~(-1) K_2SO_4), circulated rate (100-2400 mL min~(-1)) were investigated. For phenol of 100 mg L~(-1), it could be completed degraded within 30 minutes under current density 7.5 mA cm~(-2) with the addition of K_2SO_4 1.0 g L~(-1) at pH 5.6 and temperature 60 ℃. The method showed promising application for treating phenolic wastewater of high salinity and of high acidity. The overall degradation of phenol was considered a process of mass-transfer controlled. According to the proposed model and Arrhenius's Law, the activation energy was calculated to be 23.8 kJ mol~(-1).