Synthesis of highly ordered and hydrothermally stable mesoporous materials using sodium silicate as a precursor

Synthesis and characteristics of SBA-15 with thick pore wall and high hydrothermal stability

“…These approaches contain the past-treatment with organosilane [9,10], pH adjusting [11], increasing hydrothermal treatment temperature [12,13], removing surface Si-OH groups by silylation and F-ions [14,15], addition of crystal seed precursors [16,17], doping heteroatoms [18,19], and addition of inorganic salts [20,21]. These methods have played an important role in improving hydrothermal stability of mesoporous materials.…”

Hydrothermal Synthesis of SBA-15 Using Sodium Silicate Derived from Coal Gangue

“…The mesoporous silica was prepared using a slightly modified hydrothermal route [10]. P123 2 g was dissolved in 48 mL of 2 M HCl, in which 3.1 g HAc was added and stirred for 4 h to obtain solution A.…”

“…In addition, small particle size and rod-like morphology of SBA-15 received increasing interest for their fast adsorption and mass transfer [9]. Previously, most of the SBA-15 was obtained using expensive TEOS as silica precursors; thus efforts have been made to use inexpensive sodium silicate as a silica source [10][11][12]. In some earlier reports, the sodium silicate from fly ash has been used in the synthesis of SBA-15 [13][14][15][16], giving a good example for making good use of waste and reducing material costs.…”

Structural incorporation of titanium and/or aluminum in layered silicate magadiite through direct syntheses

“…2aef, no pure magadiite was obtained, leading to a faster formation of trydimite and crystobalite. This occurrence is related to the hydrolysis and high condensation speed of the titanium alkoxide in alkaline media that differs from aluminum isopropoxide [28,33] and, consequently, causes an increase in the possibility of seed formation, which leads also to contaminant phase formation. Based on these results, new samples were synthesized with prior titanium isopropoxide peptization in acidic solution.…”