Dependence of photocatalytic reaction rate on titanium dioxide concentration in aqueous suspensions
- 1 February 1994
- journal article
- research article
- Published by Taylor & Francis in Environmental Technology
- Vol. 15 (2) , 183-188
- https://doi.org/10.1080/09593339409385418
Abstract
The dependence of kinetic parameters in Langmuir‐Hinshelwood rate expression on photocatalyst (titanium dioxide) concentration in aqueous suspensions was examined theoretically, based on the theory of Turchi and Ollis for single photocatalyst particle. The results are as follows: (1) Kate constant k shows the transition from first‐order to square‐root dependency with increasing photocatalyst concentration C8 at high illumination intensity. (2) At low illumination intensity k shows the transition from first‐order to zero‐order dependency with increasing C8. (3) Equilibrium constant of adsorption K is independent of C8 when either of two species(hydroxyl radical and reactant) is adsorbed. These results are in good agreement with the experimental results reported previously.Keywords
This publication has 23 references indexed in Scilit:
- Photocatalytic degradation of organophosphorous insecticides in aqueous semiconductor suspensionsPublished by Elsevier ,2003
- Photocatalytic wastewater treatment combined with ozone pretreatmentEnvironmental Science & Technology, 1992
- Photolysis of chloroform and other organic molecules in aqueous titanium dioxide suspensionsEnvironmental Science & Technology, 1991
- Formation of nitrate and ammonium ions in titanium dioxide mediated photocatalytic degradation of organic compounds containing nitrogen atomsEnvironmental Science & Technology, 1991
- Heterogeneous photocatalysis for water purification: Contaminant mineralization kinetics and elementary reactor analysisEnvironmental Progress, 1990
- Effect of chlorine on photocatalytic degradation of organic contaminantsEnvironmental Technology, 1990
- Photocatalytic degradation of atrazine and other s-triazine herbicidesEnvironmental Science & Technology, 1990
- Photodegradation of 2- and 3-chlorophenol in titanium dioxide aqueous suspensionsEnvironmental Science & Technology, 1990
- Purification of water with near—u.v. illuminated suspensions of titanium dioxideWater Research, 1990
- Photocatalytic degradation of organic water contaminants: Mechanisms involving hydroxyl radical attackJournal of Catalysis, 1990