The immobilization of 3-(chloropropyl)triethoxysilane onto silica by a simple one-pot synthesis

Sodium silicate from rice husk ash (RHA) was transformed to functionalized silica with 3-(chloropropyl)triethoxysilane (CPTES) via a simple sol–gel technique in a one-pot synthesis. The 29Si MAS NMR of the organo–silica complex (RHACCl) showed the presence of T 2, T 3, Q 3 and Q 4 silicon centers. The 13C MAS NMR showed that RHACCl had three chemical shifts at 10.37, 26.70 and 47.69 ppm consistent with the three carbon atoms of the CPTES moiety. The presence of carbon, silicon and chlorine was determined by a combination of elemental analysis and EDX study. The 3-(chloropropyl)triethoxysilane can be immobilized onto silica within 135 min in a simple one-pot synthesis to yield organo–silica composites with T 3 ( a) and T 2 ( b) silicon sites under ambient conditions.