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The mesoporous silica modified with magnesium oxide(MgO) was synthesized by one step method and impregnating method,respectively.The samples were characterized by small angle X-Ray diffraction(XRD),N_2 adsorption-desorption and transmission electron microscopy(TEM),and the carbon dioxide adsorption capacity was analyzed by thermal gravimetric analysis(TGA).Compared with the original mesoporous silica(20.7 mg/g),the CO_2 adsorption capacity of MgO-modified mesoporous silica processed by one step method increases to 32.9 mg/g.Although its surface area greatly decreases compared with that of the original mesoporous silica,the MgO-modified mesoporous silica prepared by impregnating reaches an adsorptive value of 31.1 mg/g because the number of basic sites increases on the surface of the mesoporous silica.
The mesoporous silica modified with magnesium oxide (MgO) was synthesized by one step method and impregnating method, respectively. These samples were characterized by small angle X-ray diffraction (XRD), N2 adsorption-desorption and transmission electron microscopy (TEM), and the carbon dioxide adsorption capacity was analyzed by thermal gravimetric analysis (TGA). Compared with the original mesoporous silica (20.7 mg / g), the CO_2 adsorption capacity of MgO-modified mesoporous silica processed by one step increases to 32.9 mg / g. The surface area of the MgO-modified mesoporous silica prepared by impregnating reaches an adsorptive value of 31.1 mg / g because the number of basic sites increases on the surface of the mesoporous silica.