An ATR-FTIR study of different phosphonic acids adsorbed onto boehmite
| Autor: | María C. Zenobi, Elsa H. Rueda, Marcelo Javier Avena, Carina Vanesa Luengo |
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| Rok vydání: | 2010 |
| Předmět: |
Boehmite
Inorganic chemistry Organophosphonates Aluminum Hydroxide Protonation Hydrogen-Ion Concentration Phosphonate Atomic and Molecular Physics and Optics Analytical Chemistry Ion Solutions chemistry.chemical_compound Organophosphorus Compounds Adsorption Deprotonation chemistry Spectroscopy Fourier Transform Infrared Aluminum Oxide Aminomethylphosphonic acid Fourier transform infrared spectroscopy Instrumentation Spectroscopy |
| Zdroj: | Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy. 75:1283-1288 |
| ISSN: | 1386-1425 |
| DOI: | 10.1016/j.saa.2009.12.059 |
| Popis: | An ATR-FTIR study of the vibrational spectra of N,N-bis(2-hydroxyethyl) aminomethylphosphonic acid (BHAMP), 1-hydroxyethane-1,1'-diphosphonic acid (HEDP) and nitrilotris(methylenephosphonic acid) (NTMP) adsorbed onto boehmite is presented. The study was performed in the pH range from 5 to 9, and bands assignments are given in the 1200-900 cm(-1) wavenumber range, where the bands associated with various P-O(H) vibrations can be found. The three phosphonic acids adsorb onto boehmite by forming inner-sphere surface complexes. ATR-FTIR data indicates the presence of both protonated and deprotonated mononuclear surface species. In all cases, the surface-bound ions undergo protonation reactions as pH is decreased. The results are in good agreement with previously proposed surface complexation models. |
| Databáze: | OpenAIRE |
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