Abstract
SummaryThe adsorption isotherms of phosphate have been determined at pH 5 on K‐kaolinite, gibbsite, and pseudoboehmite at 2° and 40°C, and compared with those already determined at 20°C. The extent of adsorption increases with temperature, largely because of an irreversible increase in the number of adsorption sites.The shape of the isotherms remains essentially the same, indicating that the heat of adsorption is small, and that the driving force for phosphate adsorption is largely entropic. This was confirmed by calorimetric measurements.It is suggested that, when phosphate is adsorbed, there is an increase in the entropy of the water surrounding the phosphate ion and the adsorption site.
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