The topography and morphology of RH-Silica is shown
in Fig. 6. RH-Silica was found to be porous. EDX analysis
(Table 1) detected the presence of carbon (C), oxygen
(O) and silicon (Si) in RH-Silica. Si and O detected are due
to the formation of siloxane bond (Si–O–Si) and silanol
group (Si–OH), whereas the presence of low amount of
carbon could be from the rice husk.
Volume adsorbed (cc/g at STP)