Linear Regression Analysis for Kinetics and Isotherm Studies of Sorption of Manganese (II) Ions Onto Activated Palm ash from Waste Water

The potential of low cost adsorbent, palm oil ash was investigated as a replacement of current expensive methods for treating wastewater contaminated by Mn (II) cation. To enhance the uptake capacity, natural oil palm ash (OPA) was refluxed sodium hydroxide solution for certain period of time and temperature. Reaction rate constants were calculated by linear regression analysis of Pseudo first order, Pseudo second order, and Intra-particle diffusion kinetic equations. The linear plots of intra particle diffusion suggested that the adsorption process was mainly carried out by pore diffusion. Experimental data showed that equilibrium uptake was increased with the increase of initial Mn (II) ion concentration and contact time. The values of Langmuir dimensionless constant, R-L and Freundlich constant, 1/n were less than 1, which revealed that the adsorption process is favourable.