Surface Modification and Spectroscopic Characterization of TiO2 Nanoparticles with 2-Aminoethyl Dihydrogen Phosphate
AUTOR(ES)
Iravani, Effat, Allahyari, Sareh A., Shojaei, Zahra, Torab-Mostaedi, Meisam
FONTE
J. Braz. Chem. Soc.
DATA DE PUBLICAÇÃO
2015-08
RESUMO
A common strategy for the surface modification of nano TiO2 and other metal oxide nanoparticles is based on anchor groups using chelating ligands that can carry additional functionalities. This would allow the exploration of further applications of these materials. In the present work, we report the modification of TiO2 nanoparticles from nano TiO2 (Degussa P-25) dispersion in distilled water in the presence of 2-aminoethyl dihydrogen phosphate, followed by removing the excess of the capping agent through washing with water. The surface functionalization and the kind of surface interaction were analyzed applying different characterization methods like CHN elemental analysis, thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FTIR), attenuated total reflectance (ATR-FTIR), X-ray powder diffraction (XRD) and 1H, 13C, 31P magic angle spinning nuclear magnetic resonance spectroscopy (MAS NMR), confirming the presence of modifying agent on the surface. In the study of modified nano TiO2 by MAS NMR spectroscopy, a distinct downfield shift for 31P signal has been seen comparing to the pure cappping agent due to P-O-Ti bond formation. The phosphate groups interact with the surface via quite strong covalent interaction, while according the analyses results, the surface amine groups remained uncoordinated.
Documentos Relacionados
- Surface and textural characterization of TiO2 pillared organoclays
- Surface modification of alumina nanoparticles with silane coupling agents
- Dip coating of a carbon steel sheet with Ni reinforced TiO2 nanoparticles
- Decoration of Ti/TiO2 nanotubes with Pt nanoparticles for enhanced UV-Vis light absorption in photoelectrocatalytic process
- Enhanced photocatalytic activity of TiO2 films by modification with polyethylene glycol