Adsorption behavior of Crys tal Violet dye in aqueous solution using Co+2 hectorite composite as adsorbent surface
Volume 6, Issue 01, Pages 5-16, March 2023 *** Field: Analytical Chemistry Method
Abstract
This study focused on the adsorption behavior of the cationic Crystal
Violet (CV) dye from aqueous solutions using a Co+2‒hectorite
composite as an adsorbent surface. The initial and equilibrium CV dye
concentrations were determined using a UV-Vis spectrophotometer. The
results were discussed and presented for the impacts of pH, primary CV
dye concentration, composite dosage, and temperature. The optimum
conditions were found for eliminating Crys tal Violet dye from the
aqueous solution at a pH 4, ideal temperature 293 K, and 0.5 g L-1
of composite dose. The pseudo-second-order kinetic, intraparticle
diffusion analyzed the tes ts’ data and film diffusion models. Each
model’s defining features have been identified, and these models were
in good agreement and in charge of regulating the adsorption reaction.
The adsorption operation was also thermodynamically examined to
determine thermodynamic variables such as Gibbs free energy (ΔGo),
entropy (ΔSo), activation energy (Ea), and enthalpy (ΔHo). The negative
value of Gibbs free energy (ΔGo) and enthalpy (ΔHo) indicated that
the adsorption process was a spontaneous and exothermic reaction.
While the activation energy (Ea) data which fell within the normal
range for physisorption, was showed at 22.434 kJ mol-1.
The physical adsorption occurs between CV dye and
adsorbent .
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