Kinetics of liquid phase semiconductor photoassisted reactions: Supporting observations for a pseudo-steady-state model

Andrew Mills, J.S. Wang, D.F. Ollis

Research output: Contribution to journalArticlepeer-review

48 Citations (Scopus)

Abstract

The kinetics of liquid phase semiconductor photocatalytic and photoassisted reactions are an area of some debate, reignited recently by an article by Ollis(1) in which he proposed a simple pseudo- steady- state model to interpret the Langmuir- Hinshelwood type kinetics, commonly observed in such systems. In the current article, support for this model, over other models, is provided by a reinterpretation of the results of a study, reported initially in 1999,2 of the photoassisted mineralization of 4- chlorophenol, 4-CP, by titania films and dispersions as a function of incident light intensity, I. On the basis of this model, these results indicate that 4- CP is adsorbed more strongly on P25 TiO2 when it is in a dispersed, rather than a film form, due to a higher rate constant for adsorption, k(1). In addition, the kinetics of 4- CP removal appear to depend on I-beta where, beta = 1 or 0.6 for when the TiO2 is in a film or a dispersed form, respectively. These findings are discussed both in terms of the pseudo- steady- state model and other popular kinetic models.
Original languageEnglish
Pages (from-to)14386-14390
Number of pages5
JournalJournal of Physical Chemistry B
Volume110
Issue number29
DOIs
Publication statusPublished - 27 Jul 2006

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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