Environmental Engineering Reference
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Figure 11.3
Effect of concentration of Tartrazine (pH = 2.0) on adsorption over
0.01 g/25mL Hen Feathers at different temperatures.
adsorbed obtained for each adsorption system indicates that an increase in
concentration of the dye decreases the resistance towards the dye uptake,
which increases the mass driving force between adsorbent and adsorbate,
thereby enhancing the percentage adsorption of the dye.
11.4.2.3 Effect of Temperature
The effect of temperature on the adsorption of the Azo dyes can be
observed in the Figures 11.2 (Amaranth-Hen Feather system) and 11.3
(Tartrazine-Hen Feather system). It can be observed that the Amaranth
and Tartrazine dyes exhibit an increase in the adsorption with increas-
ing temperature, thereby indicating the purely endothermic nature of the
ongoing adsorption.
11.4.2.4 Effect of Adsorbent Dosage
It can be observed that in both cases the adsorption of the dye increases
with an increase in the amount of Hen Feather. The graphical represen-
tation of this behavior can be observed for the Amaranth-Hen Feather
(Figure 11.4) and Tartrazine-Hen Feather (Figure 11.5) systems. The
increase in adsorption with increasing amounts of the adsorbent is mainly
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