INVESTIGADORES
MARTIN carlos Alberto
artículos
Título:
Photocatalytic Intrinsic Reaction Kinetics. II: Effects of Oxygen Concentration on the Kinetics of the Photocatalytic Degradation of Dichloroacetic Acid
Autor/es:
C.S: ZALAZAR, C.A. MARTÍN Y A.E. CASSANO
Revista:
CHEMICAL ENGINEERING SCIENCE
Referencias:
Año: 2005 vol. 60 p. 4311 - 4322
ISSN:
0009-2509
Resumen:
The effect of oxygen on the reaction kinetics of the photocatalytic oxidation of dichloroacetic acid at pH below the titanium dioxide
isoelectric point (pH from 5 to 4) was studied. A kinetic scheme based on the direct hole attack to the dichloracetate ion in conjunction
with the classical role of oxygen acting as an electron acceptor is proposed. Oxygen also intervenes in a direct addition reaction to one
of the intermediate reaction products. Experiments were conducted in a well-mixed, small, .at plate reactor employing Aldrich titanium
dioxide as the photocatalyst in the suspension mode and using polychromatic irradiation with energy in the range from 275 to 385 nm
in wavelength. A complete mathematical model, including the effect of the absorbed radiation intensities and catalyst concentration was
developed. Experimental data agree well with theoretical predictions employing just two kinetic parameters derived from the proposed
reaction mechanism.