Preparation of Silicagel-MnO2 Nanocomposite Adsorbent for Malachite Green Removal

Silicagel-MnO2 (Si-MnO2) nanocomposite was prepared by co-precipitation method, and characterized using SEM, XPS and FT-IR techniques. Afterwards, adsorption behavior of malachite green (MG) dye onto prepared Si-MnO2 has been examined and optimized. Batch procedure has been used for sorption kinetic and equilibrium examinations. The experiments have been done with an initial concentration of 100 mg.L-1 at room temperature. The representation of the equilibrium data is fully assessed via Freundlich and Langmuir isotherms. With regard to Langmuir model, the greatest adsorption capacity of MG dye onto Si-MnO2 was found to be 107.5 mg.g-1, at room temperature. Kinetic examinations revealed that adsorption procedure follows pseudo-first-order model. Based on the results, prepared Si-MnO2 may be economically and efficiently used as an adsorbent to remove MG dye from wastewater samples. Desorption of the dye has been done using HCl 0.1 mol.L–1 solution and regenerated Si-MnO2 can be used for five cycles of MG dye adsorption.