Synthesis of easily shaped ordered mesoporous titanium-containing silica

Abstract

A synthesis for easily shaped Ti-containing mesoporous silicates has been reported, which uses as-prepared mesoporous silica SBA-15 as a host template, an inorganic titanium salt (such as TiCl 3 or TiOSO 4 ) as a titanium source and water as a solvent. The synthesis involves three steps: obtaining as-prepared mesostructured silicate, grafting functional moieties, and thermal treatment, which is feasible in industry. The as-prepared titanium-containing mesostructured silicates can be easily shaped. XRD, N 2 sorption isotherms, TEM, FT-IR and UV-vis techniques reveal that Ti-containing mesoporous silicates after calcination have the highly ordered 2-D hexagonal mesostructure, high surface areas (475-837 m 2 /g), large pore volumes (0.56-0.92 cm 3 /g), uniform pore sizes (6.4-7.3 nm), and tetrahedrally incorporated titanium species in silica frameworks. The titanium source has a great influence on grafting.

Aminolysis of epoxides catalyzed by three-dimensional, mesoporous titanosilicates, Ti-SBA-12 and Ti-SBA-16

“…1). These diffraction patterns of SBA-16 can be indexed to an ordered, three-dimensional, mesoporous, cubic structure with space group of Im À 3m [20,21,[23][24][25]. Ti incorporation did not alter the integrity of the framework structure.…”

Controlled Drug Release of Modified Mesoporous Silica with Higher Driving Forces Derived from the Accurate Dispersion of Azobenzene Groups

“…In the spectra of TUSA, SiO 2 and SiO 2 -TSUA shown in Fig. 2a, the broad peaks at 1,100cm − 1 assigning to the stretching vibrations of Si-O-Si were clearly observed [27]. The peak at 2900cm − 1 corresponding to the C-H stretching vibration of -CH 3 in CTAB disappeared in the spectrum of SiO 2 -TSUA showing the successful removal of the surfactant [28,29].…”

Effect of Engineered Solid and Mesoporous Silica Particles Physical Properties on In Vitro Toxicity

“…Brunauer-Emmett-Teller (BET) analysis or nitrogen adsorption is used to determine the surface area of the particles, with relative pressure set between 15-20%. From the BET isotherm data, the Harkins-Jura equation (t =(13.99/(0.034 -log p/p s )) 1/2 ) is used to determine t, the thickness of nitrogen gas (N 2 ) layers in angstroms, based on the relative pressure (p/p s ) and plots of this data against the adsorbed gas layer for the same relative pressure as described in [12,13]. The external surface area is determined from the slope of the t-plot.…”