Code: |
BPGTD91 |
Paper Type: |
Article |
Author(s): |
Bleam WF, Pfeffer PE, Goldberg S, Taylor RW, Dudley R |
Title: |
A phosphorus-31 solid-state nuclear magnetic resonance study of phosphate adsorption at the boehmite/aqueous solution interface |
Journal: |
Langmuir
Volume: 7 (8) Year: 1991 Pages: 1702-1712
ISSN-Print: 0743-7463 |
Internal Storage: |
V4178 |
DOI: |
10.1021/la00056a023 |
Abstract: |
Results from 31P solid-state NMR experiments provide direct evidence for the hydrolysis of phosphate molecules adsorbed on the surface of boehmite (γ-AlOOH). Much of the phosphate surface-excess molecules are in chemical environments that are highly sensitive to solution pH, and the phosphate molecules are held relatively immobile. This chemical environment is believed to be inner-sphere surface complexes. The results of “interrupted-decoupling” 31P{1H} cross-polarization, magic-angle-spinning NMR experiments are used to discriminate protonated surface phosphate species from those that are fully deprotonated. The pH at which surface phosphates become deprotonated lies somewhere between 9 and 11. This transition pH is an NMR observable which can be predicted by surface-complexation models. |
Comment: |
RAW_GRAPH (diagrammed raw data) |
Surface Area
|
Site Density / Protolysis
|
Complex Formation
|
Formatted Citation
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