Ion Exchange Dynamics in Cerium Nitrate Solution Regulated by Remotely Activated Industrial Ion Exchangers.

Talkybek Jumadilov,Laila Yskak,Oleg Suberlyak,Aldan Imangazy

doi:10.3390/ma14133491

Abstract

Many technological solutions contain valuable components as waste and can become an additional source of rare-earth elements to meet the needs of modern production. The development of technologies based on commercially available and cheap sorbents reveals the possibility for rare earth recovery from various solutions. This paper provides research on using a combination of KU-2-8 and AV-17-8 ion exchangers in different molar ratios for cerium ions sorption from its nitrate solution. The mutual activation of the ion exchangers in an aqueous medium provides their transformation into a highly ionized state by the conformational and electrochemical changes in properties during their remote interaction. The ion exchange dynamics of solutions were studied by the methods of electrical conductivity, pH measurements, and atomic emission analysis of the solutions. The research showed that the maximum activation of polymers was revealed within the molar ratio of KU-2-8:AV-17-8 equal to 3:3. In more detail, in comparison to AV-17-8, this interpolymer system showed an increase in the sorption degree by more than 1.5 times after 6 h of interaction. Moreover, compared with KU-2-8, the same interpolymer system showed an increase in the degree of cerium ions sorption by seven times after 24 h of interaction. As a result, the total cerium ions sorption degree after 48 h of sorption by individual KU-2-8 and AV-17-8 was 38% and 44%, respectively, whereas the cerium ions sorption degree by the same interpolymer system in the molar ratio 3:3 became 51%. An increase in the sorption degree of cerium ions by the interpolymer system in comparison with individual ion exchangers can be explained by the achievement of a high ionization degree of ion exchangers being activated in the interpolymer system by the remote interaction effect.

Highlights

Rare-earth metals are used in various applications: in the chemical industry, in nuclear engineering, in metallurgy, etc. [1,2,3]
This paper investigates the use of KU-2-8 and AV-17-8 ion exchangers for cerium ions sorption from aqueous solutions
The experiments showed that the swelling degree of the KU-2-8 took the value Ksw = 1.71; in comparison, this ion exchanger outside the interpolymer system had a swelling degree Ksw = 1.31

Summary

Introduction

Rare-earth metals are used in various applications: in the chemical industry, in nuclear engineering, in metallurgy, etc. [1,2,3]. Rare-earth metals are used in various applications: in the chemical industry, in nuclear engineering, in metallurgy, etc. Cerium is a silvery-white rare-earth element that is forged and machined [4]. Cerium is used as an alloying addition. The addition of only 1% of cerium to magnesium dramatically increases the latter’s tensile strength. Cerium metal is a good “getter”, absorbing most gases (oxygen, hydrogen, nitrogen, carbon dioxide, etc.) and binding them through chemisorption. This metal is widely used in pyrotechnic compositions, the powder of which is pyrophoric. The recovery of cerium from technological solutions will provide an additional source of this valuable element

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