Modification of titanium surface species of titania by attachment of silica nanoparticles
Silica nanoparticles-attached titania (TiO2@SiO2) was prepared by modification of the surface of titania (TiO2) with octadecyltrichlosilane (OTS) as a source of silica. The attachment of silica was achieved through repeated deposition-hydrolysis-calcination of OTS on the surface of titania particles...
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| Format: | Article |
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Elsevier B.V.
2006
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| Online Access: | http://eprints.utm.my/7293/ |
| _version_ | 1848891438572503040 |
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| author | Nur, Hadi |
| author_facet | Nur, Hadi |
| author_sort | Nur, Hadi |
| building | UTeM Institutional Repository |
| collection | Online Access |
| description | Silica nanoparticles-attached titania (TiO2@SiO2) was prepared by modification of the surface of titania (TiO2) with octadecyltrichlosilane (OTS) as a source of silica. The attachment of silica was achieved through repeated deposition-hydrolysis-calcination of OTS on the surface of titania particles. For comparison, the silica-titania composite (TiO2-SiO2) containing titania and silica agglomerated particles was also prepared. The physicochemical characteristics of TiO2@SiO2 and TiO2-SiO2 particles are experimentally studied by X-ray diffraction (XRD), UV-vis diffuse reflectance (UV-vis DR), scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDAX) and 29Si solid-state magic angle spinning nuclear magnetic resonance (MAS NMR) techniques. The effect of silica attaching on activity of titanium surface species has been tested in the liquid phase epoxidation of 1-octene to 1,2-epoxyoctane with aqueous hydrogen peroxide. It is demonstrated that the surface attachment of titania with silica nanoparticles enhances the epoxidation activity of titania. UV-vis DR spectra of the solid particles showed the increase in intensity of the tetrahedral titanium in TiO2@SiO2. This indicates the occurrence of the transformation of some of the octahedral titanium to the tetrahedral structure during silica attaching of TiO2@SiO2 in which titanium tends to bond with -Si(OH)2(OSi)2 to make it stable in tetrahedral form. Considering that the tetrahedral titanium was considered the most active species in epoxidation of alkene, it can be concluded that a high epoxidation activity of TiO2@SiO2 particle was related to the modification of the local environment of titanium surface species by attachment of silica nanoparticles. |
| first_indexed | 2025-11-15T20:57:58Z |
| format | Article |
| id | utm-7293 |
| institution | Universiti Teknologi Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-15T20:57:58Z |
| publishDate | 2006 |
| publisher | Elsevier B.V. |
| recordtype | eprints |
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| spelling | utm-72932009-01-02T03:34:10Z http://eprints.utm.my/7293/ Modification of titanium surface species of titania by attachment of silica nanoparticles Nur, Hadi TP Chemical technology Silica nanoparticles-attached titania (TiO2@SiO2) was prepared by modification of the surface of titania (TiO2) with octadecyltrichlosilane (OTS) as a source of silica. The attachment of silica was achieved through repeated deposition-hydrolysis-calcination of OTS on the surface of titania particles. For comparison, the silica-titania composite (TiO2-SiO2) containing titania and silica agglomerated particles was also prepared. The physicochemical characteristics of TiO2@SiO2 and TiO2-SiO2 particles are experimentally studied by X-ray diffraction (XRD), UV-vis diffuse reflectance (UV-vis DR), scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDAX) and 29Si solid-state magic angle spinning nuclear magnetic resonance (MAS NMR) techniques. The effect of silica attaching on activity of titanium surface species has been tested in the liquid phase epoxidation of 1-octene to 1,2-epoxyoctane with aqueous hydrogen peroxide. It is demonstrated that the surface attachment of titania with silica nanoparticles enhances the epoxidation activity of titania. UV-vis DR spectra of the solid particles showed the increase in intensity of the tetrahedral titanium in TiO2@SiO2. This indicates the occurrence of the transformation of some of the octahedral titanium to the tetrahedral structure during silica attaching of TiO2@SiO2 in which titanium tends to bond with -Si(OH)2(OSi)2 to make it stable in tetrahedral form. Considering that the tetrahedral titanium was considered the most active species in epoxidation of alkene, it can be concluded that a high epoxidation activity of TiO2@SiO2 particle was related to the modification of the local environment of titanium surface species by attachment of silica nanoparticles. Elsevier B.V. 2006-08-30 Article PeerReviewed Nur, Hadi (2006) Modification of titanium surface species of titania by attachment of silica nanoparticles. Materials Sciences and Engineering B: Solid-State Materials for Advanced Technology, 133 (1-3). pp. 49-54. ISSN 0921-5107 http://dx.doi.org/10.1016/j.mseb.2006.05.003 10.1016/j.mseb.2006.05.003 |
| spellingShingle | TP Chemical technology Nur, Hadi Modification of titanium surface species of titania by attachment of silica nanoparticles |
| title | Modification of titanium surface species of titania by attachment of silica nanoparticles |
| title_full | Modification of titanium surface species of titania by attachment of silica nanoparticles |
| title_fullStr | Modification of titanium surface species of titania by attachment of silica nanoparticles |
| title_full_unstemmed | Modification of titanium surface species of titania by attachment of silica nanoparticles |
| title_short | Modification of titanium surface species of titania by attachment of silica nanoparticles |
| title_sort | modification of titanium surface species of titania by attachment of silica nanoparticles |
| topic | TP Chemical technology |
| url | http://eprints.utm.my/7293/ http://eprints.utm.my/7293/ http://eprints.utm.my/7293/ |