2015 : Synthesis of mesoporous silica with controlled pore structure from bagasse ash as a silica source
Ir. Sri Rachmania Juliastuti M.Eng
Prof.Dr.Ir. Heru Setyawan M.Eng.
Mesoporous silica with controlled pore structure was prepared from bagasse ash as a silica source. The silica in the bagasse ash was dissolved by NaOH solution to produce sodium silicate precursor for the mesoporous silica, with or without polyethylene glycol (PEG) template. Without the PEG template, the pore structure was greatly influenced by the pH and the presence of Na+ ions. The porous silica produced in the presence of Na+ possessed higher surface area and pore diameter than those produced in the absence of Na+. The surface area and pore diameter reached approximately 525Â m2Â g−1 and 18Â nm, respectively, when the gelation pH was 3. When the gelation pH was increased, the surface area decreased while the pore diameter increased. The use of PEG template increased significantly the surface area, which reached approximately 656Â m2Â g−1 when the template was removed by solvothermalÂ …