The possible use of wood ash as an adsorbent of nickel sulphate from dilute solutions and
the effect of operating parameters were investigated in this study. The rate constants of
adsorption were determined at different concentrations and temperatures. The applicability
of the first-order reversible equation and an empirical kinetic model were tested to
understand the kinetics of nickel sulphate removal at different concentrations. Pore diffusion
was found as the rate-controlling step. The Langmuir and Freundlich isotherms were applied …

The possible use of rubberwood [Hevea brasiliensis] ash as an adsorbent of nickel sulfate
from dilute solutions and the effect of operating parameters were investigated in this study.
The rate constants of adsorption were determined at different concentrations and
temperatures. The applicability of the first-order reversible equation and an empirical kinetic
model were tested to understand the kinetics of nickel sulfate removal at different
concentrations. Pore diffusion was found as the rate-controlling step. The Langmuir and …