Interaction of Orthophosphate with Iron( 111) and Aluminum Hydroxides
نویسنده
چکیده
The influence of pH and aging upon the phosphate binding capacity of iron(II1) or aluminum hydroxides has been investigated. The formation of reactive polynuclear hydroxo complexes by the hydrolyzing cations and the subsequent oxolation process are starting points of a discussion of the observed influence of the experimental conditions upon the rate and extent of phosphate adsorption. The ratio between the quantity of phosphate adsorbed and the concomitant release of hydroxyl ions has been measured and interpreted in terms of change in charge of the complexes formed. Some practical consequences of the iron/aluminum interaction with phosphate for water treatment processes such as coagulation, deferrization of groundwater, and for phosphate release from iron-rich sediments are explained in terms of effects of pH, aging, and charge.
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