Crystallization of well-defined anatase nanoparticles in SBA-15 for the photocatalytic decomposition of acetic acid

Abstract

Crystallization of well-defined anatase nanoparticles (5 nm) in the mesopore (6 nm) of SBA-15 over 400 °C, results the high photocatalytic activity for decomposition of acetic acid compared with other commercial titanium dioxides.

Well-Defined Single and Bundled Rutile Nanorods in Mesoporous Silica for Efficient Hydrogen Evolution Photocatalysis

“…The diffraction characteristics of SBA-15 are not clear for SBA-15-TiO 2 -1 and SBA-15-TiO 2 -2 due to the incorporation of guest species in the mesopore, and no diffraction peaks corresponding to crystalline phases of TiO 2 were observed. These observations are consistent with our previous studies on SBA-15-anatase hybrids. − , …”

“…The X-ray diffraction patterns of SBA- 67 when SBA-15-TiO 2 -1 and SBA-15-TiO 2 -2 were heated in air at 300 °C for 3 h in air were observed in our previous studies. [55][56][57][58]61 On the contrary, in this study, the diffraction peaks and the Raman signals ascribable to rutile 55,61,67 were observed when SBA-15-TiO 2 -1 and SBA-15-TiO 2 -2 were stored at room temperature in air for 4 weeks and 1 week, respectively, as shown in Figure 2. However, aging without HCl exposure did not lead to the crystallization of rutile, as shown by the diffraction peaks and Raman signals (Figure 2C).…”

“…The excess of TTIP, which possibly deposited on the external surface of SBA-15, was removed by absorbing with a cellulose paper. The studies on preparation of the TiO 2 impregnated in SBA-15 were reported previously. − , Then, the partially hydrolyzed TTIP was condensed by exposing the samples with hydrochloric acid (HCl) vapor at room temperature. The samples are designated as SBA-15-TiO 2 -1, for the sample prepared using neat TTIP, and SBA-15-TiO 2 -2, for the sample prepared using the IPA solution of TTIP (TTIP/IPA = 1:8).…”

“…During the study on the preparation of nanosized TiO 2 by the template synthesis in a PMS, SBA-15, crystallization of rutile in the mesopore at room temperature was found . The crystallization of TiO 2 in/on PMSs has been reported extensively, while the products were commonly anatase to the best of our knowledge. − The mixture of anatase and rutile was obtained by heat treatment of the SBA-15-TiO 2 hybrid, in which the mesostructure of SBA-15 was collapsed while heating at temperatures over 800 °C. , In this paper, based on the room temperature formation of rutile in SBA-15 and the unique pore connection of SBA-15, the formation of rutile nanoparticles in SBA-15 (BJH pore diameter of 8 nm) was investigated extensively to control the size and shape of the nanoparticles by varying the loading amount of the titanium source as well as crystallization condition for the application to photocatalytic hydrogen evolution from aqueous methanol.…”

Advanced Ordered Nanoporous Materials

“…However, the complex template techniques are less favorable since the templates themselves are not easy to prepare. Sol-gel processes in the presence of soft template have been widely employed (Cabrera et al 1999;Valange et al 2000;Niesz et al 2005), such as the evaporation-induced self-assembly (EISA) method.…”