Solar photocatalytic degradation of textile effluent with TiO, ZnO, and NbO catalysts: assessment of photocatalytic activity and mineralization.

The photocatalytic degradation of textile effluent was investigated using TiO, ZnO, and NbO catalysts under solar irradiation. The procedures were carried out at ambient conditions in April 2014, with pH 3.0 and catalyst concentration of 0.250 g L. The photocatalytic activity of the oxides was evaluated by means of kinetic efficiency (rate constant and half-life time), chemical oxygen demand reduction, and absorbance reduction at 228, 254, 284, 310, 350, 500, and 660 nm (λ). Mineralization in terms of the formation of inorganic ions and toxicity reduction using bioassays with Artemia salina were performed. TiO reduced the absorbance at 660 nm (λ) after 300 min of solar irradiation around 94 and 93%; and 68 and 60% of COD, respectively. ZnO showed lower photocatalytic activity giving 64 and 42% of absorbance and COD reduction, respectively. The photocatalytic activity of NbO was very close to TiO-P25. In this sense, NbO becomes a promising alternative to replace the commercial TiO-P25. Bioassays confirmed the efficacy of treatment, increasing the lethal concentration of 27.59 (in natura) to 131.95% in the presence of NbO.