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Mechanism of phosphate interaction with two reference clays and an anatase pigment
Author(s) -
Malati Mounir A.,
Fassam Robert A.,
Henderson Ian R.
Publication year - 1993
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.280580412
Subject(s) - endothermic process , adsorption , enthalpy , anatase , point of zero charge , phosphate , chemistry , mica , chemical engineering , montmorillonite , inorganic chemistry , exothermic reaction , langmuir adsorption model , materials science , thermodynamics , organic chemistry , photocatalysis , metallurgy , engineering , catalysis , physics
The adsorption of phosphate by well‐characterised kaolin, mica or anatase followed the Langmuir isotherm. At pH values below the point of zero charge of each powder, adsorption was endothermic. A ring closure mechanism involving two adjacent adsorption sites would increase the entropy of the system compensating for the endothermic enthalpy change.