A study of Zinc ions adsorption by native and chemically modified leaves of earleaf acacia (<i>Acacia auriculiformis</i>)

Isotherms of Zn 2+ ions adsorption by native and 3% H 2 SO 4 solution-treated leaves Acacia auriculiformis were plotted. The resulting isotherms processed using the Langmuir, Freundlich, Dubinin-Radushkevich Temkin models. It was found that these with earleaf acacia are most accurately described model modified Langmuir model. modification a solution contributes to an increase in maximum sorption capacity for from 9.5 mg/g 30.5 mg/g. kinetics is pseudo-second order calculated values Biot's coefficient range 1 &lt; B i 20, which indicates mixed diffusion all cases. Thermodynamic parameters process acid-modified determined. (E) Gibbs (∆G 0 ) energies, as well enthalpy entropy indicate spontaneous, self-induced endothermic physical both