Rice husk silica was introduced to MCM-41 synthesis and modified by three kinds of silylating reagents to improve its surface properties. Concentrations and aging times were also used in our study. Bulk structure of modified RH-MCM-41 remained unaffected with increasing concentration and aging time. However, the larger chemical structure lower BET surface area and average pore size. The adsorption isotherm data consistently showed typical type IV of IUPAC classifications for all studied samples. By the silylation technique, hydrophilic functional group such as silanol was substituted by silane groups. Silylated RH-MCM-41 showed higher hydrophobicity than RH-MCM-41; therefore, silylated RH-MCM-41 at sufficient concentration and aging time (T1-1) is favorable material for adsorption and catalytic applications.
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