Fotodegradación sensibilizada con TiO2 del colorante rojo recoltive utilizando lámpara de luz UV
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Date
2006
Journal Title
Journal ISSN
Volume Title
Publisher
Área Metropolitana del Valle de Aburrá
Abstract
Introduction. In textile industry there is a big production of waste water coming from all processes
and it is difficult to be treated worldwide. Currently, research works are being made, applying
advanced oxidation processes among which we have homogeneous and heterogeneous photo
catalysis. This term is understood as the process that uses ultra violet light and an inorganic and
semi conductive solid material, to provoke a chemical transformation.
Objective. To evaluate the photo degradation sensitized with titanium dioxide for the recoltive
red dye, by using an ultra violet light lamp.
Materials and Methods. Several rehearsals were made with a 100 mgL-1 concentrations of the
recoltive red dye used in the textile industry. It was also put under photo catalysis processes with
an ultra violet lamp. Using TiO2 as a catalyst and H2O2 as an oxidant, we aim to identify the conditions
under which this process is most effective. The rehearsals were made three times each, always
with a joint pH control. The parameters measured were the dye degradation percentage and the
mineralization, keeping in mind that the substances produced must be those less polluting. A twolevel
experimental factorial design was applied to the data obtained, with interaction between the
photo catalyst and the oxidant agent.
Results. The rehearsals with a higher degradation percentage and a faster reaction are for the titanium
dioxide with hydrogen peroxide under the following concentrations: 100 mgL-1 TiO2 and 2%
of H2O2 for a 96% degradation and 0 of TiO2 and 2% v/v of H2O2 for a final degradation of 93%.
Conclusions. The effect, when the titanium dioxide concentration is increased, is a higher degradation
of the recoltive red dye. This ratifies the fact that the increase of the TiO2 allows that more
active points exist to generate hydroxyl radicals and, therefore, a higher possibility of augmenting
the degradation and mineralization percentages.
Description
Keywords
Fotocatálisis, Tratamiento de aguas residuales, Fotodegradación, Aguas residuales coloreadas, Corporación Universitaria Lasallista, Área Metropolitana del Valle de Aburrá, Mineralización, Oxidación, Peróxido de hidrógeno (H2O2)