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18.
Preparation and role of Coprecipited NiS-ZnS in
photocatalytic degradation of Alizarin red S
Vijaya Sharma*, Neelam Gandhi, Ankur Khant and R.C. Khandelwal
Photochemistry
laboratory, Dept. of Chemistry, B.N. P.G. College, Udaipur
(Rajasthan)-313001, India
Email:
vijs_sharma@yahoo.com
Abstract.
The
photocatalytic degradation of alizarin red S by
using coprecipited NiS-ZnS in 1:5 ratio has been studied.
Coprecipitation method used for preparing NiS-ZnS. The effect of
operational parameters, i.e. pH of the solution, photocatalyst
content, initial dye concentration and effect of light
intensities on the rate of photocatalytic process has been
examined for both NiS-ZnS and pure ZnS for a comparative study.
Result obtained is revealed that Coprecipited NiS-ZnS showed
high activity for photocatalytic degradation of alizarin red S.
The Photodegradation follows a pseudo-first-order degradation. A
tentative mechanism has been proposed for photocatalytic
bleaching of dyes.
KEY WORDS:
NiS-ZnS, Photocatalytic degradation, Alizarin red S,
Coprecipitation.
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