Advanced removal of crystal violet dye from aqueous solutions by photocatalysis using commercial products containing titanium dioxide

Abstract

Two commercial products containing titanium dioxide, P-25 and Kronos 7000, were used for the detailed investigation of the advanced degradation of crystal violet (CV) dye by photocatalysis. The parametric study concerning the influence of the initial dye concentration, photocatalyst dose, pH of the medium and hydrogen peroxide addition in the reaction batch was performed. The net superiority of P-25 in the decolorization was further highlighted by measuring the mineralization degree by TOC. The potential application of the results is confirmed by reaching 86–87% mineralization degrees after 180 min in the presence of $1~\mathrm{g}{\cdot }\mathrm{L}^{-1}$ P-25 or in 120 min using additionally 100 ppm H$_{2}$O$_{2}$.

Keywords

• Crystal violet
• Photocatalytic removal
• Mineralization
• Hydrogen peroxide
• Commercial titania