Please use this identifier to cite or link to this item:
http://hdl.handle.net/1942/15971
Title: | 31P SS-NMR and ATR-IR characterization of TiO2 fuctionalized with phosphonic acids for solid phase extraction and purification applications | Authors: | TASSI, Marco REEKMANS, Gunter VANHAMEL, Martine ADRIAENSENS, Peter CARLEER, Robert |
Issue Date: | 2013 | Source: | NMR Discussion Group (NMR-DG) meeting, Eindhoven, 08/11/2013 | Abstract: | Transition metal oxides, as titanium dioxide, are gaining interest because of their intrinsic chemical and corrosive stability in a wide variety of solvents and pH-ranges (1). The modification of these materials is usually accomplished to incorporate chemical groups on the surface, introducing new properties in view of applications such as chromatography, adsorbents, sensors and membranes (2). The reaction between hydrophilic titanium dioxide (TiO2) and phosphonic acids, as phenylphosphonic acid (PPA) or octylphosphonic acid (OPA), results in the formation of an hydrophobic surface layer. Aromatic or alkyl phosphonic acids can be bonded to the surface by physical adsorption or chemically through covalent bonds. Generally there are two reaction mechanisms involved in the formation of Ti-O-P bonds: i.e. heterocondensation or Ti-O-Ti cleavage. The first mechanism is based on the esterification between the phosphonic group and the hydroxyl groups at the titanium surface (3) while the second mechanism is based on the protonation of oxo groups (Ti-O-Ti) of the metal oxide tetragonal structure (4). Ti-O-P bonds are characterized by ATR-FTIR and 31P-CP/MAS NMR techniques. Modified titanium dioxide materials with enhanced hydrophobicity, obtained by dedicated synthesis, are tested in solid phase extraction experiments to verify their applicability in separation processes. 1. J. Schwartz et al., Materials Science and Engineering C, 23, 395-400, 2003. 2. B.M. Silverman, K.A. Wieghaus, J. Schwarz, Langmuir, 21, 225-228, 2005. 3. P.H. Mutin, G. Guerrero, A. Vioux, J. Mater. Chem., 15, 3761-3778, 2005. 4. G. Guerrero, P.H. Mutin, A. Vioux, Chem. Mater., 13, 4367-4373, 2001. | Keywords: | titanium dioxide(TiO2); phosphonic acids; hydrophobic surface layers; chromatography, adsorbents, sensors and membranes; 31P-CP/MAS NMR; ATR-FTIR | Document URI: | http://hdl.handle.net/1942/15971 | Category: | C2 | Type: | Conference Material |
Appears in Collections: | Research publications |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
Poster-NMR-DG (1).pdf | Conference material | 1.36 MB | Adobe PDF | View/Open |
Page view(s)
338
checked on Aug 9, 2022
Download(s)
52
checked on Aug 9, 2022
Google ScholarTM
Check
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.