The influence of selected parameters on the photocatalytic degradation of azo-dyes in the presence of TiO2 aqueous suspension

Adsorption and photodegradation of Procion yellow H-EXL dye in textile wastewater over TiO2 suspension

“…From the zeta potential data of the P-25 TiO 2 catalyst, its equilibrium point value (pH pzc ) is 6.26 ± 0.05. Thus its surface charge should be positively polarized at pH lower than the pH pzc according to equation (1) (Baran et al 2008 …”

“…In the last decade, most attention has been given to TiO 2 due to its high photocatalytic activity, low cost, nontoxicity and high stability in aqueous solution (Hermann et al 1999). The photocatalytic degradation of azo dyes has been investigated on various TiO 2 nanoparticles as suspension (Akyol et al 2008;Baran et al 2008) or immobilized (Mahmoodi et al 2009), TiO 2 /ZnO (Franco et al 2009), WO 3 -/ TiO 2 activated carbon (Sun et al 2009), Au-TiO 2 (Kumar et al 2008), and Co doped TiO 2 -SiO 2 (Li et al 2008). In this study, a synthetic wastewater containing a commercial reactive dyes, Procion yellow H-EXL, was used to investigate a clean and safe removal of the dyes from solutions using ultraviolet-irradiated TiO 2 suspension.…”

Photocatalytic Degradation of Textile Dye and Wastewater

“…The aqueous suspension was magnetically stirred throughout the experiment. Samples of 5 mL were taken at different time intervals and centrifuged for 15 min at 4,000 rpm prior to analysis (Baran et al 2008). Experiments were carried out by varying the pH of the solution (pH 3.0-9.5) and catalyst loading (0.5-3.0 g/L).…”

Catalytic Activity of Biomorphic α-MoO3 in the Degradation of Methyl Violet Dye

“…Thus more MV could be involved in the reaction when using biomorphic MoO 3 under irradiation than that using the commercial MoO 3 powder. On the other hand, the turbidity of the solution might induce the screening effect (Baran et al, 2008a), which would limit the effectiveness of the catalyst. Even under the same weight of biomorphic MoO 3 and commercial MoO 3 , their solution turbidity was not the same because of the shapes of particles.…”