Abstract
Mesoporous MCM-41 silica was modified using both inorganic and organic precursors and characterized by XPS, NMR and XRD. The surface properties and pore structure of the modified MCM-41 samples were characterized by measuring the adsorption isotherms of nitrogen, volatile organic compounds (n-hexane, benzene, acetone, and methanol) and water vapor. Modification using organic reagents was found to result in a significant loss in porosity and surface properties. With inorganic modifying reagents, the decrease in porosity was also observed, while the adsorption behavior was similar to that before modification. Surface modification using both organic and inorganic precursors can drastically enhance the hydrothermal stability of MCM-41 materials due to enhanced surface hydrophobicity (in the case of organic modifications) or increased pore wall thickness (in the case of inorganic modification).
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