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- W2069654364 abstract "Results are presented for the equilibrium extent of dark adsorption and the initial rates of TiO2(P25)-sensitized photocatalytic decomposition (PCD) for monochlorophenols (Cp) in aqueous suspension at various initial concentrations. When a high flux (2×1018 min−1 per 30 ml of suspension) of photons at 365±10 nm was used, a zero-order dependence of PCD on eq[4-Cp]aq was observed, allied to a low apparent efficiency. Apparent efficiencies were much higher under a much lower UV flux (1.7×1016 min−1) and the dependence of the initial rate on eq[4-Cp]aq then resembled that frequently associated with a Langmuir—Hinshelwood-type saturation. However, the equilibrium extent of dark adsorption of the monochlorophenols onto TiO2 determined experimentally was very small at eq[Cp]aq⩽100 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 inital PCD rates and the apparent efficiency attainable with a high photon flux, such increases being consistent with decreased hole—electron recombination due to electron localization on the adsorbed Ag+. Results are also reported from the competition-type kinetic experiments at moderate intensities in which 3-chloro-4-hydroxybenzoic acid (CHBzA), isopropanol or furfuryl alcohol were added to the suspensions to compete against 4-Cp for holes and/or OH. radicals photogenerated at the TiO2—aqueous solution interface. These results cannot be rationalized solely in terms of hole scavenging by well-adsorbed CHBzA or of homogeneous scavenging of OH. radicals by alcohols in the bulk aqueous phase." @default.
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- W2069654364 title "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" @default.
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- W2069654364 doi "https://doi.org/10.1016/1010-6030(94)80051-0" @default.
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