Investigation Of The Possibility For Removal Of Hexavalent Chromium Using Manganese Ferrite Nanoparticles

The present study aims at removal of hexavalent chromium from aqueous solution using manganese ferrite (MnFe2O4) nanoparticles. The investigated material was obtained by solution combustion method using starting reagents Mn(NO3)(2)center dot 4H(2)O and Fe(NO3)(3)center dot 9H(2)O (as oxidizers) and citric acid (as a reducer). Nanoparticles of MnFe2O4 were characterized by X-ray diffraction and scanning electron microscopy. The porous structure of the studied material was investigated by low-temperature nitrogen adsorption. Batch adsorption experiments were performed to evaluate the effect of various parameters, such as contact time, acidity of initial solutions and chromium concentration. Pseudo-first order, pseudo-second order and intraparticle diffusion models were used to analyze kinetic data. Equilibrium experimental data are fitted to linear Langmuir and Freundlich adsorption models. The Langmuir isotherm most adequately describes the adsorption process. The maximum adsorption capacity was calculated. The results indicate that investigated material is a suitable adsorbent for removing Cr(VI) from wastewater, but additional modification of manganese ferrite nanoparticles is planned for further experiments to increase their adsorption capacity.