Abstract
A hierarchical rambutan-like MnCo2O4 precursor is synthesized by a co-precipitation method in water–ethanol at room temperature. After being calcined at 400 °C in air for 10 min with a heating rate of 1 °C min−1, the precursor MnCo2(C2O4)3·5.54H2O is transformed into the rambutan-like MnCo2O4 microspheres composed of end-connected nanorods, which has a large specific surface area (155 m2 g−1). When evaluated as adsorbent for methyl orange (MO), the rambutan-like MnCo2O4 microspheres show excellent adsorption ability for methyl orange. The adsorption capacity of methyl orange on rambutan-like MnCo2O4 is 185.14 mg g−1 under the conditions of initial MO concentration 12 mg L−1 and pH 2.09. Adsorption kinetics of methyl orange on rambutan-like MnCo2O4 follows the pseudo-second-order kinetic model. The values of adsorption activation energy E a and enthalpy ΔH # are 5.71 ± 0.056 and 9.30 kJ mol−1, respectively. Methyl orange adsorption on rambutan-like MnCo2O4 is an endothermic and physical adsorption process.
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