Properties of the polyacrylic acid resin duolite es 346 containing amidoxime anchor groups with respect to the separation of uranium from sea water

Abstract

Loading curves, rate of exchange and distribution coefficients of Duolite ES 346 are determined for U q + , C 3 + and F$+ , using simulated sea water. The crude resin gives off ammonia into solution which leads to precipitation of uranyl ions and high apparent distribution coefficients. With the purified resin the following distribution coefficients are measured at pH 8.1: & ( U a + ) = &(Cd+) = &(F2+) = 0.6 * 10' ml/g. This leads to a loading of the resin in sea water of pH 8.1 with uranium only to about 20 pg per g of resin. ZUSAMMENFASSUNG: Die Beladungskurven, die Austauschgeschwindigkeit und die Verteilungskoeffizienten von Duolit ES 346 wurden unter Verwendung von simuliertem Meerwasser fur U@+ , C d + und Ft?+ bestimmt. Das rohe Harz gibt Ammoniak in die Losung ab, was zur Ausfdlung von Uranylionen und scheinbar hohen Verteilungskoeffizienten fuhrt. Fur das gereinigte Harz wurden die folgenden Verteilungskoeffizienten bei pH 8,l gemessen: &(U@+) = K.,(Cd+) = &(Ft?+) = 0,6 * lU' ml/g. Dies fuhrt zu einer Beladung des Harzes in Meerwasser vom pH 8,l mit Uran bis etwa 20 pg pro g Harz.* Assuming that nitrogen is present only in form of amidoxime groups. * Atomic emission spectrometry by use of inductive coupled plasma.

Synthesis, characterization, and catalytic activity of 4 mol % N,N′‐methylene bisacrylamide crosslinked poly(acrylic acid)–metal complexes

“…24,25 The pH dependence of metal-ion complexation was used for the selective separation of metal ions from a mixture of metal ions. In this study, because most of the metal ions were prone to precipitation at higher pH values, investigations were limited up to those pH values where precipitation was just prevented.…”