Usefulness of alkoxyltitanosiloxane for the preparation of mesoporous silica containing a large amount of isolated titanium

Kwang Min Choi, Ryutaro Wakabayashi, Takashi Tatsumi, Toshiyuki Yokoi, Kazuyuki Kuroda

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

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 ((iPrO)Ti[OSi(OtBu)3]3, TS3) was synthesized and TS3 was mixed with mesoporous carbon (CMK-3), a hard template. The mixture was pyrolyzed at 180°C to form a composite consisting of titanosilica and the hard template. After calcination at 600°C for the removal of the carbon template, the titanium species were not transformed to anatase TiO2, 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 N2 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.

Original languageEnglish
Pages (from-to)240-247
Number of pages8
JournalJournal of Colloid And Interface Science
Volume359
Issue number1
DOIs
Publication statusPublished - 2011 Jul 1

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Keywords

  • Alkoxytitanosiloxane
  • Isolated titanium
  • Ti-containing mesoporous silica

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry

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