Metal-Ion Selectivity of Phosphoric Acid Resin in Aqueous Nitric Acid Media
Metal ion selectivity of a phosphoric acid resin (RGP), which was derived from addition of phosphoric acid to epoxy groups of macroreticular poly(glycidyl methacrylate-co-divinylbenzene), was studied by measuring pH dependency of distribution ratios of various metal ions between RGP and nitric acid solutions. In nitric acid media, RGP exhibits extremely high adsorption ability toward Ti(IV), Mo(VI), and Fe(III). Furthermore, its selectivity sequence for common trivalent and divalent metal ions was quite different from that of conventional cation exchange resins having sulfonic acid groups, suggesting that RGP will be useful for the elimination of some heavy metal ions which are not strongly adsorbed by sulfonic acid resins.
KeywordsNitric Acid Solution Acid Resin Nitric Acid Medium Aqueous Nitric Acid Phosphoric Acid Group
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- 11.L. G. Stilen and A. E. Martell, Stability Constants of Metal-Ion Complexes (Special Publication 25), The Chemical Society London, 1971.Google Scholar
- 13.F. Helfferich, “Ion Exchange”, McGraw-Hill, New York, 1962, p230.Google Scholar
- 14.A. Jyo, K. Yamabe, and H. Egawa, Chemistry for the Protection of the Environment 2, Ed. by L. Pawlowski, W. J. Lacy, C. G. Uchrin, and M. R. Dudzinska, Plenum Press, London and New York, pp. 121–129.Google Scholar
- 15.M. Kakuda Ed., Saishin Kyucyaku Gijutsu (The Newest Adsorption Techiniques), Sogogijutsu Senta, Tokyo, 1993, pp.271–286.Google Scholar