Studies on the ammonium form of crystalline zirconium phosphate. III. Ammonium-hydrogen ion-exchange on .ALPHA.-zirconium phosphate prepared by the direct precipitation method.

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概要

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• The ammonium–hydrogen ion-exchange on α-zirconium phosphate prepared by the direct precipitation method has been investigated by means of pH titration and X-ray diffractometry. In the forward process (α-zirconium phosphate to the ammonium form) the ion-exchange reaction took place in one stage at the equilibrium pH of 5.9–6.0 and the α-zirconium phosphate exchanger was directly converted into the ammonium form. In the reverse process (the ammonium form to α-zirconium phosphate) the reaction proceeded in three stages, that is, the ammonium form→ a half-exchanged form→ an intermediate form→α-zirconium phosphate. The chemical composition of the half-exchanged form has been represented as Zr(NH<SUB>4</SUB>PO<SUB>4</SUB>)(HPO<SUB>4</SUB>)·<I>n</I>H<SUB>2</SUB>O (<I>n</I>>0.5). A small amount of ammonium ions in the exchanger could not be easily replaced with protons in the solution.

• 公益社団法人 日本化学会の論文

著者

• Hasegawa Yoshitsugu

  Department Of Applied Chemistry Faculty Of Technology Tokyo University Of Agriculture And Technology

• Kuwayama Motomasa

  Department of Industrial Chemistry, Faculty of Technology, Tokyo University of Agriculture and Technology

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• Studies on the ammonium form of crystalline zirconium phosphate. III. Ammonium-hydrogen ion-exchange on .ALPHA.-zirconium phosphate prepared by the direct precipitation method.
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