Photocatalytic Decolorization Of Reactive
Black 5 Dye In Aqueous TiO2/ZnO
Suspension Under UV Light
Author(s)
S. Kapoor & A. Kanwar
Abstract
The release of colored wastewaters in the ecosystem is a dramatic source of
aesthetic pollution, eutrophication, and perturbations in aquatic life. Research
devoted to the ill-effects caused by chemicals have acquired importance as a
result of the increased care and attention paid to the environment and human
health by international, socio-political, and legislative authorities. Compliance
with strict quality standards is especially called for, in the case of handling and
using toxic substances that affect the environment and health. Growing concern
about environmental issues has prompted the industries to investigate appropriate
and eco-friendly treatment technologies. The prime need of these industries is to
have a simple but effective inexpensive technology for the treatment of
wastewater. Photocatalysis is considered as an important part of emerging
greener technology as it uses environmentally friendly oxidants (oxygen,
hydrogen peroxide or ozone), photocatalysts (titanium dioxide, ferrous ions or its
complexes), and ultraviolet (UV) radiation to degrade and mineralize the toxic
organic pollutants. In this study, the photodecolorization of Reactive Black 5 dye
has been performed using titanium dioxide (TiO2 P-25 Degussa) and zinc oxide
(ZnO) using a mixed batch reactor. The rate of degradation was studied in terms
of changes in absorption spectra and reduction in chemical oxygen demand
(COD). Various process parameters such as catalyst dose, pH, and dye initial
concentration have been varied and their effect on the decolorization efficiency
has been studied. The photocatalyst zinc oxide was found to be more efficient as
compared with titanium dioxide.
Keywords: heterogeneous photocatalysis, reactive black 5 dye, zinc oxide,
titanium dioxide, UV light.
Keywords
heterogeneous photocatalysis, reactive black 5 dye, zinc oxide,
titanium dioxide, UV light.
Related Book
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