Nickel (II) ion desorption kinetic modeling from unmodified and chemically modified oil palm (Elaeis guineensis) fruit fibre absorbents

Abstract

The desorption of Ni²⁺ from three oil palm fruit fibre adsorbents (UOPF, 0.5MOPF and 1.0MOPF) using five desorbing solutions showed a desorption efficiency following the trend, 0.1M HCl > 0.1MH₂SO₄ > 0.1MHNO₃ > 0.1MNaOH >hot deionized H₂O. The Elovich desorption constant, β values for the 0.1MHCl desorbent were: 6.45 X10^-1, 5.57 x 10^-1 and 4.34 x 10^-1g. mg-.min^-1 for UOPF,0.5MOPF and 1.0MOPF adsorbents respectively. The surface residence time ح values for the 0.1MHCl desorbent were; 32.3, 28.6 and 26.8 seconds for UOPF, 0.5MOPF and 1.0MOPF adsorbents respectively. Kinetic modeling analysis of the Elovich and pseudo-first order desorption equations, indicates that the latter model described the desorption of Ni²⁺ better.

Keywords: Nickel, desorption, modeling, kinetics, Elovich, oil palm

Journal of Applied Science, Engineering and Technology, Volume 8, 2008