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Interrelationships between pollutant concentration, extent of adsorption, TiO2-sensitized removal, photon flux and levels of electron or hole trapping additives 1. aqueous monochlorophenol—TiO2(P25) suspensions by Joseph Cunningham; Petr Sedlák is a Materials Science article available to read on EtoBox.

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Results are presented for the equilibrium extent of dark adsorption and the initial rates of TiO,(P25)-sensitized photoeatalytic decomposition (PCD) for monoehlorophenols (Cp) in aqueous suspensions at various initial concentrations. When a high flux (2x 10" min-' per 30 ml of suspension) of photons at 365 f 10 nm was used, a zero-order dependence of PCD on 'q[4-Cp], was observed, allied to a low apparent efficiency. Apparent efficiencies were much higher under a much. lower UV flux (1.7 X 1OL6 min-') and the dependence of the initial rate on q[4-Cp], then resembled that frequently associated with a Langmuir-Hinshehvood-type saturation. However, the equilibrium extent of dark adsorption of the monochlorophenols onto TiOl determined experimentally was very small at "q[Cp],,~lOO ppm, above which it increased slowly in a manner consistent with an adsorption isotherm of the multilayer type. Additions of Ag' to the suspension greatly increased the initial PCD rates and the apparent efficiency attainable with a high photon flux, such increases being consistent with decreased hole-electron recombination due to eIectron localization on the adsorbed Ag+. Results are also reported from the c

Who reads Interrelationships between pollutant concentration, extent of adsorption, TiO2-sensitized removal, photon flux and levels of electron or hole trapping additives 1. aqueous monochlorophenol—TiO2(P25) suspensions?

Author

Joseph Cunningham; Petr Sedlák

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 1010-6030)

Published

1994

Language

EN

Field

Materials Science (Physical Sciences)