Modelling the kinetics of stearic acid destruction on TiO2 ‘self-cleaning’ photocatalytic films

The kinetics of stearic acid, SA, removal by photocatalytic films are modelled using a log-normal distribution in surface reactivity, which shows that as the ρ, increases, so too does apparent order reaction, m, observed variation SA concentration, [SA], versus irradiation time, t. model is used to fit [SA] vs. t profiles exhibited three very different TiO2 films, namely Activ™ self-cleaning glass, and prepared sol-gel P25 films. These show decay kinetics, with m = 0.3, 0.44 0.6, respectively, predicted width, values, 0.4, 0.54 0.7, respectively. A Ag photocatalyst indicator ink on these highlight non-uniform reactivity micron scale. use better understand discussed briefly.