Hen Feather: A Remarkable Adsorbent for Dye Removal - Green Chemistry for Dyes Removal from Wastewater - page 409

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Hen Feather: A Remarkable Adsorbent
for Dye Removal
Alok Mittal and Jyoti Mittal
Department of Chemistry, Maulana Azad National Institute of Technology,
Bhopal, India
Abstract
This chapter outlines the role of Hen Feather as a potential adsorbent for the eradi-
cation of the hazardous azo class of dyes from wastewater. It first describes the
imperative need for clean water for mankind and the importance of the adsorp-
tion technique over other physicochemical methods in the removal of hazardous
pollutants from water.
In the next section of the chapter, an elaborative discussion of Azo dyes, their
uses, importance and toxicity, are described by exhibiting the experimental
results of the adsorption of two important azo dyes, Tartrazine and Amaranth,
over the adsorbent Hen Feather. This section also includes a detailed literature
survey on the physical characteristics of Hen Feather and its use by authors and
various workers as an adsorbent to remove metals, dyes and other pollutants from
wastewater.
The results of the adsorption of the undertaken dyes over Hen Feather include
preliminary studies by monitoring the effects of pH of solution, concentration
of dyes, amount of adsorbent, temperature, etc. The ongoing adsorption was
monitored by Langmuir, Freundlich, Tempkin and D-R adsorption isotherms,
and their detailed results are presented in this section along with various evalu-
ated thermodynamic parameters. Kinetics of the dye-Hen Feather adsorption is
also presented on the basis of rate constant studies and elucidation of reaction
mechanism.
Keywords: Azo dye, hen feather, tartrazine, amaranth, adsorption, isotherm,
kinetics