Adsorptive Removal of Methylene Blue and Malachite Green from Wastewater using Orange Peel as Adsorbent

Abstract

In the present study, the use of cheap and eco-friendly adsorbent (Orange Peel) has been studied as an alternative to commercial activated carbon for removal of dyes (methylene blue and malachite green) from wastewater by batch adsorption process. The parameters such as contact time, initial dye concentration, adsorbent dose, pH, particle size were investigated. From the results obtained; it was found that the adsorption increases with an increase in contact time, initial dye concentration, adsorbent dose and decreases with a decrease in the adsorbent particle sizes while the initial dye pH increases or decreases depending on the pH. The kinetic models such as pseudo-first-order and pseudo-second-order were tested. It was found that the maximum adsorption capacities for methylene blue and malachite green on Orange peel were 5.286 mg/g and 4.121 mg/g respectively. The kinetic data fitted well with the pseudo-second-order model.