Investigation of Kinetics and Equilibrium Isotherms of Direct Red 12B Dye Adsorption on Hazelnut Shells
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Abstract
In this work, efficiency and performance of Hazelnut shells (HS) adsorbent was examined for the
removal and recovery of Direct Red 12B (DR12B) from wastewater. The absorbance of DR12B was measured
spectrophotometrically at λmax=523 nm before and after adsorption of DR12B. The maximum removal was
99.8% for 30 mg L–1
of DR12B concentration on 0.3 gr HS adsorbent. Acidic pH was favourable for the
adsorption of DR12B. The influence of variables including pH, concentration dye, particle size, amount of
adsorbent, temperature, in column method and kinetics, isotherm, contact time on the dye removal has been
investigated in batch method by one at a time optimization method. The effect of foreign cations, anions and
other dyes was investigated on removal efficiency. In order to investigate the efficiency of DR12B adsorption on
the HS, pseudo-first-order, pseudo-second-order, Elovich and intra-particle diffusion kinetic models were studied.
The graphical correlation of various adsorption isotherm models like, Langmuir, Freundlich and Tempkin have
been carried out for this adsorbent.