Synthesis and characterization of tin oxide-modified mesoporous silica by the repeated post-grafting of tin chloride

Citation
Y. Teraoka et al., Synthesis and characterization of tin oxide-modified mesoporous silica by the repeated post-grafting of tin chloride, MICROP M M, 48(1-3), 2001, pp. 151-158
Citations number
23
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
MICROPOROUS AND MESOPOROUS MATERIALS
ISSN journal
1387-1811 → ACNP
Volume
48
Issue
1-3
Year of publication
2001
Pages
151 - 158
Database
ISI
SICI code
1387-1811(20011101)48:1-3<151:SACOTO>2.0.ZU;2-E
Abstract
Modification of mesoporous silica with tin oxide was investigated by the re peated post-grafting method, which consisted of the repetition of the cycle of hydroxylation of the surface, grafting of tin(IV) chloride through the reaction with surface hydroxyl groups and calcination in air. The singly Sn O2-modified material showed extremely high thermal stability up to 950 degr eesC as well as the stability against the treatment in basic solution (pH = 10). With increasing the number of cycles, XRD peak intensity characterist ic to the hexagonal mesophase decreased gradually, but the mesoporous struc ture was maintained up to the third modification. The optical absorption du e to tin oxide was emerged by the modification and its absorbance increased with an increase in the modification cycles. The repeated modification wit h tin oxide caused progressive decreases in specific surface area, mesopore volume and diameter, while no significant change of the hexagonal cell par ameter was observed. It was suggested from the enhanced stabilities and the pore-structure change that inner wall and outer surfaces of the mesoporous silica was progressively coated with the tin oxide layer, (C) 2001 Elsevie r Science B.V. All rights reserved.