Thorns, a Novel Natural Plants for Adsorption of Lead (II) Ions from Wastewater Equilibrium, Isotherm, Kinetics and Thermodynamics
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Publication date: 2019-05-23
Eurasian J Anal Chem 2019;14(2):emEJAC191040
Thorns, a novel plant material, were found to exhibit excellent adsorption capacity over a wide range of Pb(II) concentration. It was characterized by Fourier transform infrared spectroscopy and Scanning Electron Microscopy to support the adsorption ofPb(II)ions. Effect of different parameters likes pH, contact time ,initial concentration and different electrolytes was investigated using batch process to optimize conditions for maximum adsorption. The adsorbent data were analyze using Langmuir, Freundlich, isotherm equations at 30°, 40° and 50 °C. Thermodynamic parameters such as standard enthalpy change(ΔH°), free energy change (ΔG°) and entropy change (ΔS°)were also evaluated and the results indicated that adsorption of Pb(II)spontaneous and endothermic. Various kinetics models including the Pseudo-first-order kinetics, Pseudo-second-order kinetics and Intraparticle diffusion models have been applied to the experimental data to predict the adsorption kinetics. Kinetic study was carried out by varying initial concentration of Pb(II) at constant temperature and it was found that pseudo-second-order rate equation was better obeyed than pseudo-first-order equation supporting that chemisorptions process was involved.