Photocatalytic degradation of azo dye Orange II in aqueous solutions using copper-impregnated titania

Abstract

During dyeing process, industries consume large quantity of water and subsequently produce large volume of wastewater. This wastewater is rich in color and contains different dyes. Orange II is one of them. In this article, metal-impregnated TiO 2 P-25 catalyst was used to enhance the photocatalytic degradation of Orange II dye. Photodegradation percentage was followed spectrophotometrically by the measurements of absorbance at k max = 483 nm. The effect of copper-impregnated TiO 2 P-25 photocatalyst for the degradation of Orange II has been investigated in terms of percentage removal of color, chemical oxygen demand (COD) and total organic carbon (TOC). As such 98 % color removal efficiency, 97 % percentage removal of COD and 89 % percentage removal of TOC was achieved with TiO 2 P-25/Cu catalysts under typical conditions. Copper-impregnated TiO 2 P-25 photocatalyst showed comparatively higher activity than UV/ H 2 O 2 homogeneous photodegradation. The relative electrical energy consumption for photocatalytic degradation was considerably lower with TiO 2 P-25/Cu photocatalyst than that with homogeneous photodegradation. Transmission electron microscopic analysis was used for catalyst characterization.

Degradation of selected industrial dyes using Mg-doped TiO2 polyscales under natural sun light as an alternative driving energy

“…Textile mills, food and dairy, printing and paper, pharmaceutical, and paint industries are the major consumers of large amount of water and the largest industrial sectors causing intense water pollution. Wastewater disposed by these industries is mostly contaminated with a large variety of synthetic organic dyes and pigments (Divya et al 2013;Wang et al 2015;Blanco et al 2012). Moreover, usage of such colorants in these industries is unavoidable nowadays.…”

Application of response surface methodology (RSM) for optimization of color removal from POME by granular activated carbon

“…There are many processes available for removal of color from waste effluents, namely chemical oxidation (McClung and Lemley 1994), foam flotation (Lin and Lo 1996), electrolysis (Bousher et al 1997), biodegradation (Oakes and Gratton 1998), adsorption (Poulios and Aetopoulou 1999;Ncibi et al 2007), chemical coagulation (Papic et al 2000) and photocatalysis (Lopez-Grimau and Gutierrez 2006;Divya et al 2013). However, adsorption onto activated carbon seems to be one of the effective and reliable physicochemical treatment methods (Pala and Tokat 2002;Mall et al 2005) and due to economical and environmentally friendly reasons (Toor and Jin 2012).…”

Adsorptive Removal of a Reactive Azo Dye Using Polyaniline-Intercalated Bentonite

“…The Flory-Huggins isotherm was developed to describe the surface coverage characteristic degree of adsorbate onto adsorbent, and the model is given as [45][46]: (14) …where k fH is equilibrium constant, n fH is the number of adsorbate ions occupying active sites, and θ is the surface coverage degree. The plots of log(θ/C 0 ) versus log(1-θ) are shown in Fig.…”

“…Therefore, physical and chemical methods, including coagulation [9], adsorption [10][11] membrane filtration [12][13], and advanced oxidation [14][15] are employed to treat dye wastewater. Among these techniques, adsorption is attracting increasing interest due to its properties of simple operation, high performance, and low running cost [16][17].…”