Enhanced electro-catalytic oxidation of dye wastewater with polyoxometalates supported catalyst

A charge transfer complex(TMB)3PMo12 was synthesized with molybdophosphoric acid and 3,3',5,5'-tetramethylbenzidine.Morphologies and microstructures were characterized by IR spectrometry and X-ray diffraction.The heteropolyanion shows a keggin structure.Electrocatalytic oxidation of acid red 3R was investigated in the presence of(TMB)3PMo12 supported on γ-Al2O3 as packing materials in the reactor.The results showed that(TMB)3PMo12/γ-Al2O3 had good electrocatalytic activity for decolorization of Acid Red 3R.When(TMB)3PMo12 loading was 0.6%,(TMB)3PMo12/γ-Al2O3 filling was 50g,pH value of Acid Red 3R was 4,the voltage was 15.0V,air-flow was 0.14m3/h,and electrode span was 3.0cm,the decolorization efficiency could reach 79.7%.The treatment efficiency of electro-catalytic process was greatly higher than that of electrochemical oxidation process in two dimensional flat reactor and three dimensional electrode reactor.