Issue 11, 1985

Adsorption of rare earths with crown ether adsorbents

Abstract

Crown ether-phosphotungstic acid (PW) and crown ether-phosphomolybdic acid (PMo) precipitates, and also the granular entrapped crown ether-PMo (or PW) in polyacrylamide, were prepared and applied as adsorbents for rare earth metal ions. Adsorbents containing 15-crown-5, such as 15-crown-5-PMo, were better adsorbents than the other crown ether precipitates. The adsorption capacity of 15-crown-5-PMo for Eu3+ was determined and corresponded to about 0.166 mmol of Eu3+ per gram of the adsorbent. The effects of pH and metal ion concentration on adsorption were also investigated. Crown ether-PMo (or PW) precipitates underwent hydrolysis at pH [gt-or-equal] 1, but the granular entrapped crown ether-PMo (or PW)-polyacrylamide adsorbents were not hydrolysed at pH [gt-or-equal] 1. The adsorption of individual rare earth ions with 15-crown-5-PMo-polyacrylamide showed that Tb3+, Nd3+, Eu3+ and Gd3+ were readily adsorbed, but adsorption was difficult for Ce4+, Sm3+ and Dy3+.

Article information

Article type
Paper

Analyst, 1985,110, 1387-1390

Adsorption of rare earths with crown ether adsorbents

J. Shih, L. Tsay and S. Wu, Analyst, 1985, 110, 1387 DOI: 10.1039/AN9851001387

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