Abstract
This study examined the use of Onion Skins, an inexpensive adsorbent material, for removing the Methyl Violet dye which represents the main objective by using batch adsorption process to investigate and understand the adsorption behaviour, the kinetics and the equilibrium isotherm using a low-cost adsorbent. The study included the influence of contact time and the dosage of adsorbent experiment. The Onion skins was dried, cleaned and crushed. Batch experiments were applied to study the contact time effect using dye with an initial fifty milligram per litter concentration, and different amounts (0.5, 1.0, 1.5, 2.0) gm of adsorbent were used to study the dosage effect. The batch experiment showed a good dye removal with 51.3% during the first 150 min and 54.03% using 1.0 gm of adsorbent. Three kinetics models were applied: Pseudofirst, pseudosecond order and adsorption model for intraparticle diffusion. Pseudosecond and intraparticle diffusion were highly fitted models with a correlation of 0.9998 and 0.9691 respectively. Isotherm study was applied using the Langmuir, Freundlich and BET model, Freundlich model was best fitted model with a correlation of 0.9945, which suggesting a multilayer adsorption.
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