Equilibrium and kinetics modeling biosorption of Zn(II) in aqueous solution using durian (Durio zibethinus) seed as low-cost biosorbent

Intan Lestari, Salmariza Sy, H

Abstract

The research of biosorption Zn(II) in aqueous solution using durian seed powder has been conducted. The capability of durian seed powder to biosorption of Zn(II) in aqueous solution is affected by the solution pH, contact time, stirring speed, biosorbent mass and initial concentration in the solution. Experiments conducted in a batch at room temperature. The biosorption capacity increases with increasing initial concentration of Zn (II). The optimum condition biosorption obtained at pH 4, contact time of 60 minutes, stirring speed of 150 rpm, 0.1 g biosorbent mass and initial concentration of 200 mg/L. The equilibrium data was calculated using equation model of Langmuir, Freundlich and Temkin isotherm. The kinetic data were analyzed using Lagergren kinetics equation pseudo-firstorder, pseudo-second-order and diffusion intra particles.