Batch adsorber design for different solution volume/adsorbent mass ratios using the experimental equilibrium data with fixed solution volume/adsorbent mass ratio of malachite green onto orange peel

Equilibrium studies were carried out at 305 K for the sorption of malachite green onto orange peel for a fixed operating line condition (solution volume/adsorbent mass ratio or VIM ratio). The experimental data were fitted to the Freundlich, Langmuir and Redlich-Peterson isotherms by non-linear method. The best fitting isothen-n was found to be the Langmuir and Redlich-Peterson isotherm. Redlich-Peterson is a special case of Langmuir isotherm when the constant g equals unity. A single stage batch adsorber was designed for different operating line (VIM) ratios using the Redlich-Peterson isotherm. Equilibrium data were obtained from the Langmuir isotherm at different VIM ratios using the mass balance equation for the batch adsorber system. A simple linear expression relating the parameters involved in the batch adsorber design was proposed for the studied system. (c) 2006 Elsevier Ltd. All rights reserved.