Removal of Azo Dye Using MWCNTs/Ti and MWCNTs-TiO2/Ti Anodes

The main objective in this research was application of Electrophoretic deposition (EPD) method for modification and coating of titanium electrodes with nano materials and their application for removal of Acid Red 33 (AR33) dye , by using electrocatalysis and photoelectrocatalysis processes. In this paper the titanium electrodes coated with multiwall carbon nanotubes (MWCNTs/Ti) and multiwall carbon nanotubes – titanium dioxide composite (MWCNTs-TiO2/Ti) were prepared by the electrophoretic deposition (EPD) method. The evaluation of efficiency of prepared MWCNTs/Ti anode for removal of AR33 indicated that high decolorization efficiency (90%) was achieved for dye concentration of 30 mg/L, using a current density of 5.5 mA cm-2 , NaCl 1g/L and pH=10 for 60 min. Also, photoelectrocatalysis (PEC) activity of MWCNTs-TiO2 composite electrode was investigated through the degradation of AR33 as a model pollutant. 98% of decolorization efficiency and 41.66% of mineralization for AR33 dye were achieved after 60 min of photoelectrocatalytic treatment using the MWCNTs-TiO2/Ti composite electrode at a current density of 7.5 mA cm−2 , dye concentration of 30 mg/L and pH=5.2.