Effects of calcination temperature on the structure and adsorption performance of Ce-Mn/AC materials |
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| Authors: | Wenwen Gao Zhifang Zhang Bi Chen Xiangrong Ma Biao Yan |
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| Institution: | 1.School of Chemistry and Chemical Engineering,Yulin University,Yulin, Shaanxi,China;2.Shaanxi Key Laboratory of Low Metamorphic Coal Clean Utilization,Yulin University,Yulin, Shaanxi,China |
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| Abstract: | Activated carbon-supported bimetallic cerium-manganese (Ce-Mn/AC) materials were prepared by impregnation method to study the effect of calcination temperature on the structure and adsorption performance of absorbents. The obtained materials were characterized by using X-ray diffraction (XRD), scanning electron microscope (SEM), N2 adsorption-desorption isotherm, Fourier transformed infrared (FT-IR), and X-ray photoelectron spectroscopy (XPS). As the results showed, the diffraction peaks of CeO2 decreased and even disappeared; Mn species were transformed from Mn3O4 to Mn2O3 on the surface of Ce-Mn/AC; the BET specific surface area increased first and then decreased on the elevating calcination temperature; the number of acid functions of AC was reduced after being modified by cerium and manganese. All these changes were directly attributed to the synergistic effects between MnOx and CeO2. AC800 exhibited the best phenol adsorption capacity. The adsorption mechanism of phenol on Ce-Mn/AC was discussed with hydrophilic (hydrophobic) interaction and hard and soft acid-base theory. |
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