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Photocatalytic degradation of 4-chlorophenol: A mechanistically-based model

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Abstract

The photocatalytic degradation of 4-CP was mathematically modelled using the mechanistic insights and data presented in an earlier study [1]. The solution and surface concentrations of reacting species were calculated by solving a system of differential equations that account for oxidation reactions of dissolved and adsorbed species, adsorption and desorption, reduction of oxygen, and hole-electron recombination. The differential equations were integrated over discrete time-periods and annular regions of the photoreactor. The resulting model predicts the trends observed in studies in other laboratories using different experimental apparati. Using the model it is possible to predict effects of reactor geometry, TiO2 loading, light intensity, and mixing on the course of TiO2 photocatalytic oxidation. The model verifies the importance of surface reactions, and reveals the need to better understand the fate and role of oxygen in TiO2 photocatalytic systems.

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Author notes

  1. U. Stafford

    Present address: Department of Chemical Engineering, Sola ADC Lenses, Wexford, Ireland

  2. K. A. Gray

    Present address: Department of Civil Engineering and Geological Sciences, Northwestern University, Evanston, IL, USA

Authors and Affiliations

  1. University of Notre Dame, 46556, Notre Dame, IN, U.S.A.

    U. Stafford, K. A. Gray & P. V. Kamat

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  1. U. Stafford
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  2. K. A. Gray
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  3. P. V. Kamat
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Stafford, U., Gray, K.A. & Kamat, P.V. Photocatalytic degradation of 4-chlorophenol: A mechanistically-based model. Res. Chem. Intermed. 23, 355–388 (1997). https://doi.org/10.1163/156856797X00574

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  • DOI: https://doi.org/10.1163/156856797X00574

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