Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 359, Issue 1, Pages 240-247Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2011.03.016
Keywords
Ti-containing mesoporous silica; Alkoxytitanosiloxane; Isolated titanium
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Funding
- Grants-in-Aid for Scientific Research [21685024, 19106015] Funding Source: KAKEN
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Mesoporous silica containing a large amount of isolated Ti was prepared from an alkoxytitanosiloxane precursor through a hard template method. Isopropoxytris(tris-tert-butoxysiloxy)titanium (((i)PrO)Ti[O-Si(O(t)Bu)(3)](3), TS3) was synthesized and TS3 was mixed with mesoporous carbon (CMK-3), a hard template. The mixture was pyrolyzed at 180 degrees C to form a composite consisting of titanosilica and the hard template. After calcination at 600 degrees C for the removal of the carbon template, the titanium species were not transformed to anatase TiO(2), proved by DR-UV-Vis, FTIR, XPS, and XRD, while the ESR results indicated the presence of isolated Ti. The mesoporous structure was verified by SEM, TEM, and N(2) adsorption. The Si/Ti ratio of the product was consistent with that of the precursor. All the results show that the material prepared from the precursor is ordered mesoporous silica containing a large amount of isolated Ti in the frameworks. The use of well-defined alkoxytitanosiloxane precursor leads to the formation of mesoporous silica with exactly controlled composition of titanium with neither loss of Ti nor transformation to anatase. (c) 2011 Elsevier Inc. All rights reserved.
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