Abstract

GUARIN LLANES, Carolay Yaneth  and  MERA BENAVIDES, Adriana Consuelo. Heterogeneous Photocatalysis with TIO₂ for Liquid Wastes Treatment with Presence of the Bromocresol Green Indicator. Rev. ing. univ. Medellín [online]. 2011, vol.10, n.19, pp.79-88. ISSN 1692-3324.

Heterogeneous photocatalysis is an advanced oxidation process applied to this kind of work for determining degradation and mineralization of the Bromocresol Green indicator present in chemical and environmental analysis laboratory liquid wastes, commonly generated in universities. Degussa P-25 titanium dioxide is used in the treatment as a catalyzer, as well as a batch-type reactor, and artificial UV radiation with a 360 nm wavelength. Degradation was quantified by UV-visible spectrophotometry and mineralization was evaluated through the DQO parameter. Optimal conditions of treatment for wastes are: 260 ppm TiO2 and a retention time of 60 minutes; degradation was 84.10% and mineralization was 82.5%. Results obtained show that the heterogeneous photocatalysis process can be useful for treatment of effluents with presence of the Bromocresol Green indicator.

Keywords : degradation; titanium dioxide; UV light; mineralization; Bromocresol green.

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