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Abstract
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), 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 CO2 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.
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