Adsorption studies of methyl orange dye removal from aqueous solution using Anchote peel-based agricultural waste adsorbent

Abstract

Abstract A low-cost locally available agricultural waste-based Anchote peel adsorbent was studied to remove the methyl orange (MO) dye from wastewater which was created at laboratory conditions. The adsorbent was characterized by Fourier infrared and x-ray powder diffraction spectroscopic techniques. The adsorption capacity of the proposed adsorbent was investigated using the batch adsorption method. The best performance was achieved after careful optimization of experimental parameters such as adsorbent dose (0.4 g), initial dye concentration (70 mg/L), contact time (140 min), pH of the solution (8.0), and temperature (40 °C), respectively. The removal of MO from water using anchote peel adsorbent achieved a removal efficiency of 94.47% following the pseudo-second-order kinetic model, Freundlich isotherm, and chemisorption mechanism, respectively. The adsorbent showed heterogeneous surfaces and the adsorption of MO was thermodynamically spontaneous. Furthermore, the present results reveal that Anchote peel adsorbent is promising in future for the removal of organic dyes and other contaminants like toxic heavy metals from water and wastewater.

Keywords

• Adsorption
• Agricultural waste
• Anchote peel
• Biosorbent
• Methyl orange