Cinética de degradación y mineralización del colorante Rojo Amaranto por medio de la fotocatálisis con luz solar
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Date
2005
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Abstract
Introduction: Oxidation sensitized with TiO2 and
sunlight, is a technique that can be used as a water
purification system, especially on the treatment of
liquid industrial wastes in which the content of
synthetic toxic compounds are difficult to be
eliminated by other conventional ways. Objective:
To determine the kinetics of degradation and
mineralization of the amaranth red dye contained
in water during the photocatalysis process with
titanium dioxide, using a parabolic cylinder sunlight
collector. Materials and Methods: To determine the
kinetics of degradation and mineralization of the amaranth red dye during photocatalysis, we proved
the order of the reaction for each one of the
experiments made, considering the color
concentrations and residual COT in order to determine,
afterwards, the constant rates of velocity and
the mid-life times of the color contained in water
after 8 hours of treatment. Results: Considering
each of the conditions of the experiments, the most
influential parameter on the times of the dye´s mid
life is the use of TiO2, along with hydrogen peroxide.
The shortest exposition to sunlight in which a 50%
diminishing of the color was made (time of midlife)
was 1.92 hours, for the condition in which 150mg/L
of TiO2 and 2 ml/L of hydrogen peroxide were used.
Under this condition a media rate of degradation of
93.48% was reached. Conclusion: The use of the
adequate quantities and concentrations of TiO2 and
H2O2 allows the treatment of dyed waters taking
time periods lower than 8 hours of sunlight to degrade
the color contained, in a high percentage, in
water.
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Keywords
Fotocatálisis