Resumo

MUESES, Miguel Ángel; COLINA-MARQUEZ, José  e  MACHUCA-MARTINEZ, Fiderman. Photocatalytic degradation of dichloroacetic acid using a radiation field of low energy. Ing. Desarro. [online]. 2008, n.24, pp.33-47. ISSN 0122-3461.

The geometry effects in the reactor and the initial concentration of substratum for a reaction of dichloroacetic acid (DCA) photodegradation with TiO₂ - P25 as catalyst using a low-energy radiant field, were evaluated in three lab-scale reactors with different geometry and absorption area. The catalyst concentration was constant and oxygen concentration was near the saturation level at room temperature. The process performance and the effect significance were evaluated through the DCA photodegradation percentage and a lineal model. The photodegradation was improved with diffuse-radiation collectors, wide absorption area, and initial low concentration of DCA. The geometric factor had the highest influence in the process performance. The model obtained a high predictive capacity with a global associated error less than 3.5% and a correlation coefficient of 0.98.

Palavras-chave : Photocatalysis; Photocatalytic Reactors; Dichloroacetic acid; Monochromatic radiation.index.

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