Effect of a pH-controlled co-precipitation process on rhodamine B adsorption of MnFe(2)O(4) nanoparticles

We investigated the effect of a pH-controlled co-precipitation process on the adsorption behavior of manganese ferrite (MnFe(2)O(4)) nanoparticles as well as their structural and magnetic properties. The pH of prepared MnFe(2)O(4) nanoparticles is typically an important factor affecting the adsorption capacity of an adsorbent. In this study, MnFe(2)O(4) nanoparticles were prepared using a co-precipitation method at four different pH values of 9.0, 9.5, 10.0, and 10.5. The adsorption behaviors on rhodamine B (RhB) by MnFe(2)O(4) nanoparticles prepared at different pH values were investigated. It was found that, via a pH-controlled process, MnFe(2)O(4) nanoparticles prepared at pH 10.5 showed the highest RhB removal efficiency. The results indicated that the large pore size and surface charge of MnFe(2)O(4) nanoparticles improved the adsorption capacities for RhB. Kinetic data were fitted to a pseudo-second order kinetic model and revealed that equilibrium was reached within 60 min. The isotherm data showed that the Langmuir maximum adsorption capacity of the MnFe(2)O(4) nanoparticles prepared at pH 10.5 for RhB was 9.30 mg g(−1).