Direct Synthesis of Mesoporous Titania Particles Having a Crystalline Wall

Abstract

In this study, we demonstrate a novel method for preparing crystallized mesoporous titania by using a low-temperature synthesis technique in the presence of cationic surfactant. XRD patterns showed that the titania particles obtained had both hexagonal structure and a wall with anatase crystalline structure. Transmission electron microscopy (TEM) observation and corresponding electron diffraction pattern confirmed that the calcined particles are crystallized mesoporous titania.

Titania/C TAB Nanoskeleton as adsorbent and photocatalyst for removal of alkylphenols dissolved in water

“…Hexagonal-structured TiO 2 /C n TAB Nanoskeleton (denoted as HX-TNS-n) was prepared through sol-gel reaction of a 3.0 mol L - 3 Br -, C n TAB, n = 12, 14, 16 and18; Aldrich) (following the procedure that we have reported previously) [30][31][32]. Precipitates thus produced were filtrated and washed by water, and finally, the powder of the HX-TNS-n was obtained after drying at 120 °C for 10 h under air atmosphere.…”

“…Then, we applied the TiO 2 /C n TAB Nanoskeleton [30][31][32] as adsorbent for removal of alkylphenols from aqueous solutions. Namely, we considered that alkylphenols dissolved in water would be removed by TiO 2 /C n TAB Nanoskeleton due to the solubilization of alkylphenols into TiO 2 /C n TAB Nanoskeleton.…”

“…Then, we considered to apply the composite particles of nanocrystalline titania (anatase) and alkyltrimethylammonium bromide (C n H 2n+1 N(CH 3 ) 3 Br, C n TAB; n = 12, 14, 16 and 18) (named as TiO 2 /C n TAB Nanoskeleton) that we have recently developed [30][31][32] as adsorbents and photocatalysts for adsorption and degradation of organic contaminants. The TiO 2 /C n TAB Nanoskeleton should extract organic contaminants from water due to the solubilization of organic contaminants into HAZMAT-D-12-01375R1 Revised January 2013 4 C n TAB domain incorporated in the TiO 2 /C n TAB Nanoskeleton and to degrade organic contaminants due to the photocatalysis of nanocrystalline titania in TiO 2 /C n TAB Nanoskeleton.…”

“…The TiO 2 /C n TAB Nanoskeleton was prepared through sol-gel reaction of titanium oxysulfate sulfuric acid hydrate (TiOSO 4 ·xH 2 SO 4 ·xH 2 O, TiOSAH) initiated by C n TAB spherical micelles in an aqueous solution in the absence of any other additives such as acid and base [30][31][32]. Compared with the synthetic methods reported [33][34][35], our synthetic system involves benefits such as (i) spontaneous formation of hexagonally ordered pore-structure through simple procedure (mixing of aqueous solutions containing TiOSAH and C n TAB but no other additives such as acid and base as reaction initiators required, (ii) crystallization of titania (anatase formation) in aqueous solutions under mild condition (e.g., at 60 ˚C for 24 h), (iii) no evaporation and calcination processes required for formation of ordered pore-structure and crystallization of titania and (iv) utilization of water as a solvent [30][31][32].…”

“…Compared with the synthetic methods reported [33][34][35], our synthetic system involves benefits such as (i) spontaneous formation of hexagonally ordered pore-structure through simple procedure (mixing of aqueous solutions containing TiOSAH and C n TAB but no other additives such as acid and base as reaction initiators required, (ii) crystallization of titania (anatase formation) in aqueous solutions under mild condition (e.g., at 60 ˚C for 24 h), (iii) no evaporation and calcination processes required for formation of ordered pore-structure and crystallization of titania and (iv) utilization of water as a solvent [30][31][32]. This matches with recent emerging environmental requirements on nanomaterial synthetic strategy such as a simplified procedure, minimized material use, low energy input and utilization of environmentally benign solvents.…”