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Silicate and Phosphate Adsorption on Gibbsite Studied by X‐ray Photoelectron Spectroscopy Angular Distributions
Author(s) -
Alvarez Robustiano,
Fadley Charles S.,
Silva James A.
Publication year - 1980
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1980.03615995004400020043x
Subject(s) - gibbsite , x ray photoelectron spectroscopy , adsorption , silicate , ion , analytical chemistry (journal) , chemistry , spectroscopy , materials science , mineralogy , physics , nuclear magnetic resonance , organic chemistry , chromatography , quantum mechanics , kaolinite
A surface‐sensitive technique based on the angular distributions of X‐ray photoelectron intensities has been used to study the adsorption pattern of Ca, Si and P on gibbsite surfaces. The profile distributions of ions extending from the average Al(OH) 3 surface plane appear to be in the order: Ca closer to the surface than Si for CaSiO 3 as adsorbate and Ca at nearly the same plane and above Si for CaCl 2 + Si(OH) 4 as adsorbates irrespective of adsorbate pH. The average positions, relative to the Al(OH) 3 atoms are: Si and P appear above the surface level when adsorbed from their respective acid forms, as is the case for more complex adsorbates like Si(OH) 4 + H 3 PO 4 + CaCl 2 , where Ca appears at the surface level. An atomic rearrangement on the gibbsite surface seems to occur in the latter case. These experiments have demonstrated that it is possible to apply the XPS (X‐ray photoelectron spectroscopy) angular distribution technique for adsorption studies on powdered soil materials, a subject of relevant interest in earth sciences.