Decolouration of textile dyes in wastewaters by photocatalysis with TiO2

Treatment of textile industry wastewater by supported photocatalysis

“…However, in spite of the wastewater variability, a decrease in the pollution in terms of COD and colour was observed under solar irradiation whatever be the sample. The alkaline pH favours the dye degradation, as noticed by Prieto et al [7] and no pH adjustment is necessary.…”

Photocatalytical Properties of TiO₂ Nanotubes

“…Since the discovery of photocatalytic water splitting on titania (TiO 2 ) by Fujishima and Honda in 1972, the interest in TiO 2 as a photocatalyst for purification of groundwater and wastewater is growing [1][2][3][4][5][6]. The effective photoexcitation of TiO 2 photocatalysts requires the application of light with energy higher than its band-gap energy [7,8], thus resulting in the formation of electrons (e or oxidant (electron acceptor) is available to trap the hole or electron, recombination is prevented and subsequent photocatalytic reactions may occur efficiently on the semiconductor surface.…”

Photocatalytic degradation of methyl red by TiO2: Comparison of the efficiency of immobilized nanoparticles versus conventional suspended catalyst

“…In the area of water and wastewater treatments, advanced oxidation processes (AOPs) are well known for the ultimate removal of organic pollutants as a final cleaning step after conventional physicochemical or biological treatments, since AOPs are able to mineralize hazardous organic chemicals to carbon dioxide, water and simple mineral acids due to the efficient production of hydroxyl radicals ( • OH), a powerful and non-selective oxidant specie [1][2][3].…”