An investigation of the mode of sorption of inositol hexaphosphate to goethite
| Autor: | Michael J. Angove, Bruce B. Johnson, Eben Seth. Quill |
|---|---|
| Rok vydání: | 2012 |
| Předmět: |
Minerals
Goethite Phytic Acid Hydrogen bond Chemistry Inorganic chemistry Infrared spectroscopy Sorption Hydrogen-Ion Concentration Phosphate Spectral line Surfaces Coatings and Films Electronic Optical and Magnetic Materials Biomaterials chemistry.chemical_compound Colloid and Surface Chemistry Adsorption visual_art Spectroscopy Fourier Transform Infrared visual_art.visual_art_medium Inositol hexaphosphate Iron Compounds |
| Zdroj: | Journal of Colloid and Interface Science. 367:436-442 |
| ISSN: | 0021-9797 |
| Popis: | Adsorption of inositol hexaphosphate (IP 6 ) on goethite has been studied as a function of pH and concentration, and by use of Attenuated Total Reflectance-Fourier Transform Infrared Spectroscopy (ATR-FTIR). While adsorption was highest at low pH, a significant amount remained adsorbed above pH 10 where, in the absence of IP 6 , the surface is expected to have a net negative charge. The adsorption isotherm at pH 5.5 indicated strong binding to the surface with each adsorbed species occupying about 2.5 nm 2 . ATR-FTIR spectra of IP 6 solutions in the pH range from 2 to 12 were fitted with a single set of IR bands which were assigned primarily by analogy with phosphate spectra. From its variation in intensity with pH the band at 1040 cm −1 was assigned to the effect of hydrogen bonding on the P O vibration. No additional bands were required to fit the spectra of IP 6 adsorbed to goethite, indicating that adsorption occurs by outer-sphere complexation in this system. At all pH values studied the band associated with hydrogen bonding was more intense for the adsorbed species than in solution at the corresponding pH indicating that hydrogen bonding plays an important role in binding IP 6 to goethite. |
| Databáze: | OpenAIRE |
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