The photocatalytic oxidation of manganese(II) in aqueous suspensions of TiO2 on UV illumination was investigated. The experimental results obtained for manganese(II) solutions as a function of the initial concentration, mass of semiconductor in suspension, pH, light intensity and temperature are reported. The pH of the solution is a key parameter that determines the efficiency of manganese(II) photo-oxidation. Near to the point of zero charge of TiO2 the adsorption of manganese(II) onto TiO2 particles increases sharply, favouring charge transfer reactions at the semiconductor-electrolyte interface. The experimental results obtained from manganese(II) solutions at neutral pH agree with the Langmuir-Hinshelwood kinetic model and the corresponding equilibrium adsorption and rate constants have been deduced. © 1992.
|Journal||Journal of Photochemistry and Photobiology, A: Chemistry|
|Publication status||Published - 1 Jan 1992|