Equilibrium and Thermodynamic Studies of Pb(II), Cu(II) and Zn(II) Adsorption onto Dicliptera bupleuroides Leaves

Abstract

Biosorption of Cu(II), Zn(II) and Pb(II) ions onto Dicliptera bupleuroides leaves (DBL) in a batch system with respect to adsorbent dose, contact time, temperature, pH and initial metal ion concentration was investigated. Langmuir, Freundlich and Temkin isotherm model were applied to describe the equilibrium data. Langmuir isotherm model provided a better fit to the experimental data than the Freundlich and Temkin isotherm. The adsorption capacity is 2.55 mg/g, 1.06 mg/g, and 1.76 mg/g for Cu(II), Zn(II) and Pb(II) respectively. The optimum adsorption conditions obtained were at contact time 75 min, pH 5, initial metal ion concentration 10 mg/L, temperature 45 o C for Cu(II) and 30 o C for Zn(II) and Pb(II) and adsorbent dose 2.5 g. Thermodynamic parameters indicated that the adsorption reactions were spontaneous (∆G 0 <0), feasible and exothermic (∆H 0 <0) .

Adsorption of Cu(II) Ion onto Activated Eupatorium Adenophorum and Acer Oblongum: Thermodynamic, Kinetic and Equilibrium Studies

“…Agricultural wastes and biomass such as peanut hull 2 , sawdust 4,5 , urticadioica 19 , Artemisia vulgarise 20 and Diclipterabupleuroides 21 have been studied for copper adsorption from aqueous solution.…”

“…Scanning electronic microscopy (SEM) is one of the most used characterization techniques applied for the analysis of surface morphology, properties, porosity and texture morphology of adsorbent [19][20][21]28 . The surface morphology of AEA and AAO before and after metal ions adsorption is shown in Figure 3 …”