多金属氧酸盐电催化降解染料废水的研究

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

采用IR和XRD等手段对磷钼酸(PMo12)和3,3',5,5'-四甲基联苯胺(TMB)形成的电荷转移配合物(TMB)3PMo12进行表征,结果表明配合物中的杂多阴离子仍保留着Keggin结构.将配合物负载于γ-Al2O3上制备(TMB)3PMo12/γ-Al2O3负载型催化剂填充于电化学反应器中,考察电催化氧化体系降解酸性大红3R染料废水的效果.研究表明,(TMB)3PMo12/γ-Al2O3催化剂对酸性大红3R废水显示了良好的电催化活性,催化剂填充量为50g,负载量为0.6%时,在pH值为4,槽电压15.0V,曝气量0.14m3/h,极板间距3.0cm反应条件下,60min后,色度去除率达到79.7%,去除效果较传统二维平板和三维电解槽更高.

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.