Decolorization of organic dyes on Pilkington Activ™ photocatalytic glass

Photocatalyzed and photosensitized conversion of organic dyes on porous and non-porous air–solid surfaces: Kinetic models reconsidered

“…1). This same kinetic model we later applied successfully to dye multi-layers of AB9 and RBk5 deposited on non-porous Pilkington Activ TM glass [2]. Mills et al [3] also found this model satisfactory for AO7 conversions on meso-porous titania films, but not for methylene blue (MB), apparently adsorbed as dye aggregate when dried on TiO 2 , and which followed a zero order bleaching after a 5 min initial period.…”

“…We developed a model which predicted that an intrinsic zero order reaction would exhibit apparent first order behavior in porous systems due to the variation of irradiance, and thus photocatalyzed rate constant, with depth into the photocatalyst [9]. Do our dye data [1,2] …”

“…Why should our dye multi-layers on nonporous Activ TM TiO 2 coated glass exhibit sequential first order behavior [2]? (ii) Stearic acid multi-layers on non-porous titania exhibit zero order kinetics [4,6,7], whereas an apparent first order behavior is observed when SA is distributed within porous titanias [7,8].…”

Perspectives and Advances in Photocatalysis

“…Instead of exploiting photocatalytic reduction, the oxidative degradation of methylene blue may suffice to assess the activity of very thin (crystallite sizes of 5-10 nm) TiO 2 films on self-cleaning glasses even with low intensity light sources (1 mWcm −2 ) (Fateh et al 2011). Chin and Ollis (2007) had investigated the kinetics of photodecolourisation of acid blue 9 and reactive black 5 on Pilkington Activ TM glass comprising 18 nm TiO 2 crystallites, using UV-A irradiance of 1.4 mWcm −2 . These workers described a novel horizontal coating method for thin layer dye deposition that minimizes the amount of solution used while forming a fairly uniform dye layer.…”

Photocatalytic Decolorization of Commercial Acid Dyes using Solar Irradiation

“…Acid Blue 9 (C.I. 42090) was only studied as a probe molecule for assessing the photocatalytic efficiency of airsolid systems (Chin and Ollis 2007;Julson and Ollis 2006), showing no significant direct photolysis (Doushita and Kawahara 2001). The photocatalytic degradation of Acid Red 51 (C.I.…”