Tratamiento de aguas contaminadas con colorantes mediante fotocatálisis con TiO2 usando luz artificial y solar
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Date
2017
Journal Title
Journal ISSN
Volume Title
Publisher
Corporación Universitaria Lasallista
Abstract
Introduction. Colored wastewater is a complex
mixture containing recalcitrant substances that
are difficult to oxidize by conventional methods.
Photocatalysis with suspended TiO2
has been shown
to be efficient in the oxidation of substances by
photoactivation of catalyst with artificial light. The use
of sunlight in the process reduces operation costs in
a full scale application of this wastewater. Objective.
Evaluate the treatment of a mixture of azoic dyes
by photocatalysis with TiO2 suspensions using solar
and artificial light. Materials and methods. An
annular reactor with artificial light was tested, and an
experimental design was applied to evaluate the effect
of dyes, TiO2 and H2
O2 concentrations. Under such
favorable conditions, the dyes mixture was degraded
using natural solar light and a batch reactor. Results.
The artificial light system showed that dyes and TiO2
concentrations were the factors that significantly
influenced on color and chemical oxygen demand
(COD) removals. Favorable operational conditions
and model equations for color and COD diminutions
were established from the experimental design. The
system with sunlight removed 100 % of color and 80
% of COD after 3h of treatment. UV-vis spectrum
of dyes mixture was studied during the process
and this showed possible formation of carboxylic
acids and subsequent mineralization. Conclusion.
Photocatalysis with TiO2 and sunlight showed the
degradative capacity of the photocatalytic process for
remediation of waters charged with mixtures of azoic
dyes.
Description
Keywords
Corporación Universitaria Lasallista, Área Metropolitana del Valle de Aburrá, Tratamiento de aguas residuales, Fotocatálisis, Colorantes, Contaminantes
Citation
Revista Producción + Limpia Vol. 12 N. 2