Abstract
MnO2-modified porous CoFe2O4 microrods (MnO2–CMR) were prepared by in situ oxidation reaction. The obtained samples were characterized by the means of scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and energy dispersive spectrometer. The results showed that the CoFe2O4 microrods were successfully decorated with amorphous MnO2. An appropriate decoration mechanism was suggested and discussed. Methylene blue (MB) was employed to evaluate the adsorption property. The measurements exhibited that the adsorption capacity was highly enhanced due to the addition of MnO2 in the porous CoFe2O4 microrods (CMR). The adsorption capacity of the as-prepared MnO2–CMR was investigated using a batch adsorption procedure. The kinetics and thermodynamics of the adsorption process were further investigated. The adsorption kinetics was well fitted by a pseudo-second-order model and the adsorption isotherms agree well with the Langmuir model. Thermodynamic analyses showed that MB adsorption onto the MnO2–CMR was endothermic and spontaneous process. Furthermore, the MnO2–CMR can be easily recycled by magnetic separation. The MnO2–CMR developed in the present study was expected to be an efficient magnetic adsorbent for the removal of MB form wastewater.
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