Photocatalytic Degradation of Acetophenone Mediated by TiO2 Under Different Experimental Conditions

Abstract

Abstract: The photocatalytic degradation of acetophenone in TiO₂ aqueous suspension has been studied with the light irradiation of wavelength λ ≥350 nm under different conditions of light intensity, initial concentration, pHand temperature. 2-Hydroxylacetophenone was identified as the main intermediate, which experienced a simultaneous photodegradation in the system. The measured pseudo-first-order rate constant was found to decrease gradually with the initial concentration of acetophenone, but the raw data fitted the Langmuir-Hinshelwood kinetic equation very well. The degradation rate was larger in a basic medium, and got increased as well under the light irradiation of higher intensity. The apparent Arrehenius activation energy was also evaluated to be 4.2—6.4 kJ/mol.

Key words: Acetophenone, Titanium dioxide, Photocatalysis, Influence factors

CLC Number:

O643.32

TrendMD:

XU Yi-Ming  . Photocatalytic Degradation of Acetophenone Mediated by TiO₂ Under Different Experimental Conditions[J]. Chem. J. Chinese Universities, 2000, 21(10): 1539.

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Photocatalytic Degradation of Acetophenone Mediated by TiO₂ Under Different Experimental Conditions

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