The
objective of this study is to prepare and characterize chitosan/zeolite
biocomposite beads and utilize them as adsorbent for removal of anionic
dye, Acid Black 194 (AB194). Characterization studies of biocomposite
beads were carried out by using Fourier transform infrared (FTIR),
thermogravimetric analysis (TGA), and scanning electron microscopy
energy dispersive X-ray spectroscopy (SEM-EDX). The ability of chitosan/zeolite
biocomposite beads as an adsorbent for the removal AB194 from an aqueous
solution has been investigated under various experimental conditions.
Maximum adsorption capacity of biocomposite beads was calculated as
2140 mg/g. The increase in temperature resulted in a higher AB194
loading per unit weight of biocomposite beads. As an additional factor
affecting the adsorption behavior of AB194, the effect of ionic strength
was investigated, and the adsorption capacity of biocomposite beads
significantly decreased. Four isotherm models were employed to elucidate
the adsorption process. The most appropriate model for the equilibrium
process was the Freundlich. The kinetic studies indicated that the
adsorption of AB194 followed the pseudo-second-order kinetics. Thermodynamic
calculations showed that the adsorption of reactive dye was a spontaneous
and endothermic process. The obtained results indicate that chitosan/zeolite
biocomposite beads as an adsorbent are promising for dye removal from
wastewater.
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