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THE MECHANISM OF PHOSPHATE ADSORPTION BY KAOLINITE, GIBBSITE, AND PSEUDOBOEHMITE
Author(s) -
MULJADI D.,
POSNER A. M.,
QUIRK J. P.
Publication year - 1966
Publication title -
journal of soil science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.244
H-Index - 111
eISSN - 1365-2389
pISSN - 0022-4588
DOI - 10.1111/j.1365-2389.1966.tb01468.x
Subject(s) - kaolinite , gibbsite , adsorption , halloysite , lamellar structure , phosphate , chemistry , chemical engineering , inorganic chemistry , amorphous solid , materials science , mineralogy , organic chemistry , crystallography , engineering
Summary The adsorption isotherms of phosphate have been determined at pH 5 on acid‐washed K‐kaolinite and gibbsite, Na‐ and Al‐kaolinites, and K‐kaolinite in the presence of KCl at 20°C. An isotherm obtained for K‐halloysite did not support the suggestion made in Part I that any part of the adsorption was due to gross inter‐lamellar penetration in the kaolinite. It is concluded from the relative behaviour of these systems that adsorption occurs on an edge—Al(OH) 2 and in some amorphous region of the clay surface.