The effect of silane modification on the adsorptive properties of natural pyrophyllite and synthetic titanium-based powders prepared by the sol-gel process

Şener Ş., Erdemoğlu M., ASİLTÜRK M., Sayılkan H.

TURKISH JOURNAL OF CHEMISTRY, vol.29, no.5, pp.487-495, 2005 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 29 Issue: 5
  • Publication Date: 2005
  • Journal Name: TURKISH JOURNAL OF CHEMISTRY
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, TR DİZİN (ULAKBİM)
  • Page Numbers: pp.487-495
  • Keywords: aminosilane coupling agents, surface modification, 4-nitrophenol, adsorption, HYDROLYSIS-CONDENSATION REACTIONS, SCIENCE-AND-TECHNOLOGY, HEAVY-METAL IONS, PRECIPITATED SILICAS, SURFACE MODIFICATION, AQUEOUS-SOLUTIONS, COUPLING AGENT, ADSORBENTS, REMOVAL, 3-AMINOPROPYLTRIETHOXYSILANE
  • Akdeniz University Affiliated: No

Abstract

Our aim was to improve the relatively poor adsorption characteristics of natural pyrophyllite and those of TiOm and Ti(OR)(x)(OH)(y)(O)(z) obtained from titanium tetraisopropoxide (TTIP) by the sol-gel process. For this purpose, the surfaces of the above-mentioned adsorbents were coated with a surface modifier by dipping them in 1% and 50% (w/w) solutions of N-(2-aminoethyl)-3-aminopropyltrimethoxysilane (DIAMO) in methanol. Realization of the coating processes was checked by FT-IR and SEM analyses. FT-IR analyses of the coated powders heat treated at 110 degrees C showed that condensation took place between OH groups of prehydrolyzed silane molecules and-hydroxyl groups and/or oxygen atoms on the surface of the powders, ensuring the attachment of the silane molecules to the surface.