Fotocatálisis heterogénea con TiO2 y H2O2 para el tratamiento de desechos líquidos con presencia de Fenolftaleína generados en los laboratorios de análisis químico de la Universidad del Cauca
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Date
2008
Journal Title
Journal ISSN
Volume Title
Publisher
Corporación Universitaria Lasallista
Área Metropolitana del Valle de Aburrá
Área Metropolitana del Valle de Aburrá
Abstract
Introduction. The heterogeneous photocatalysis using titanium dioxide in suspension is an
efficient technology that at the moment is applied for the degradation of recalcitrant contaminants.
The use of this technique is a good alternative for the degradation of the acid-base phenolphthalein
indicator, present on the liquid wastes generated by the laboratories of chemical
analysis in the University of Cauca.
Objective. To apply the heterogeneous photocatalysis using TiO2 suspended and H2O2, in the
treatment of liquid wastes with the phenolphthalein indicator.
Materials and equipment. For the photocatalysis process, a system composed of three
parts was used: A photo-reactor with a lamp of ultraviolet light that has a tube of low pressure
of mercury (wavelength 254 nm), a zone of homogenization and a pump for the recirculation
of the sample. The conditions from which the highest percentage of degradation of the indicator
was obtained, were analyzed. The specific variables analyzed in this treatment were: catalyst
concentration (TiO2 Degussa P25), oxidinsing agent concentration (H2O2), and the time of
exhibition to the light Uv. Results.The degradation and mineralization of the indicator in the
process were evaluated by using colorimetric methods.
Results. the highest percentage of degradation was 86,54% using 500 ppm of TiO2, 2600 ppm
of H2O2, and 8 hours of light Uv time exposition. These standardized conditions were applied
for the liquid wastes.
Conclusion. the use of optimum concentrations of TiO2 and H2O2 allows to obtain good degradation
percentages of the acid-base phenolphthalein indicator present in chemical wastes.
Description
Keywords
Fotocatálisis heterogénea, Peróxido de hidrógeno (H2O2), Corporación Universitaria Lasallista, Área Metropolitana del Valle de Aburrá, Fenolftaleína, Dióxido de titanio (TIO2), Aguas residuales, Aguas residuales industriales, Tratamiento de aguas residuales, Contaminación del agua