Author： Yamaguchi N. Hashitani T. Okazaki M. Takeda T.
Publisher： Academic Press
ISSN： 0021-9797
Source： Journal of Colloid and Interface Science, Vol.183, Iss.1, 1996-10, pp. : 280-284
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Abstract
Volume changes on H 2 PO - 4 adsorption with amorphous iron(III) hydroxide were determined in a mixture of aqueous solutions of phosphates (NaH 2 PO 4 ) and suspended amorphous iron(III) hydroxide at an initial pH of 5.50 or 4.50, at 298 K. Volume changes were determined by a dilatometer after the mixing of phosphate solutions and suspended amorphous iron(III) hydroxide solutions. The increased volumes of the systems after the mixing of H 2 PO - 4 solutions and suspended amorphous iron(III) hydroxide suggested that H 2 PO - 4 adsorption was accompanied by dehydration of aqueous H 2 PO - 4 ions and suspended amorphous iron(III) hydroxide in water. The estimated volume changes per mole of H 2 PO - 4 adsorption were about +15 cm 3 .
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