Investigating the adsorption of methylene blue from water by MnFe 2O4 /bentonite

Abstract

The MnFe₂O₄/bentonite was obtained by wet chemical methods and was characterized by X-ray diffraction and N₂-adsorption/desorption isotherms. Some factors affecting the MB adsorption process of materials such as pH, initial concentration, adsorbent mass, contact time and temperature were investigated. The results showed that dye adsorption capacity increased by increasing concentration, contact time, initial pH, and temperature. The adsorption kinetics of MB on modulation materials is consistent with the pseudo-second-order kinetics model. The adsorption isotherms well followed the Langmuir isotherm model and maximal adsorption capacity of methylene blue can read 119.05 mg/g at 323K. The adsorption behavior of MnFe₂O₄/bentonite is an endothermic and spontaneous process. The results show MnFe₂O₄/bentonite is a promising adsorbent for efficient removal of dye from wastewater.