Adsorption of Pb (II) ion onto Modified Doum Palm (Hyphaene thebaica) Shells: Isotherm, Kinetic and Thermodynamic Studies
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Date
2022-12-25
Journal Title
Journal ISSN
Volume Title
Publisher
Arid Zone Journal of Basic and Applied Research
Abstract
The negative impact of high concentrations of lead in the analytical
environment on humans and aquatic plants prompted this research. The
adsorption of hazardous lead from an aqueous medium using a Modified
Doum Palm (MDP) shell was investigated. The modification of the Doum
palm shell was supported via 2 M 1: 2 ZnCl2 as activating agent. The batch
equilibrium technique was employed to study the effect of initial
concentration (800 mg/L), contact time (90 min) and temperature (313 K)
on the adsorption capacity of the prepared adsorbent. Experimental data
were analyzed using four kinetic models: pseudo-first-order, pseudo-second order, intra-particle diffusion and Elovich models and it was found that the
pseudo-second-order model fitted the adsorption data most with the highest
correlation (R2 = 0.9875). The studies of thermodynamic behaviour revealed
negative values for ∆Go (-26.7036 to -28.1252 kJ/mol), and negative values
for ∆Ho
(-15.5796 kJ/mol) and ∆So
(0.03554 kJ/mol/k) respectively. These
indicated the adsorption process was exothermic, feasible and spontaneous
in the removal of the Pb (II) ion. The findings demonstrated that the
adsorbent could be exploited in the removal of Pb (II) ion from an aqueous
solution