Effect of adding dodecanol as modifier to N,N,N′,N′-tetra-n-hexyl-3,6-dithiaoctane-1,8-diamide silica-based adsorbent on the adsorption behaviors of platinum-group metals and other metals from simulated high-level liquid waste

Naoki Osawa; Seong-Yun Kim; Tatsuya Ito; Hao Wu

doi:10.1515/ract-2021-1060

Article

Effect of adding dodecanol as modifier to N,N,N′,N′-tetra-n-hexyl-3,6-dithiaoctane-1,8-diamide silica-based adsorbent on the adsorption behaviors of platinum-group metals and other metals from simulated high-level liquid waste

Naoki Osawa , Seong-Yun Kim , Tatsuya Ito and Hao Wu

Published/Copyright: October 26, 2021

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From the journal Radiochimica Acta Volume 109 Issue 12

Abstract

To adsorb and separate platinum-group metals efficiently from simulated high-level liquid waste, two adsorbents, N,N,N′,N′-tetra-n-hexyl-3,6-dithiaoctane-1,8-diamide (THDTODA)/SiO₂-P and (THDTODA + dodecanol)/SiO₂-P, were prepared by impregnation of THDTODA with or without dodecanol into macroporous silica/styrene–divinylbenzene copolymer composite particles SiO₂-P. The effect of the addition of dodecanol to THDTODA fixed silica-based adsorbents on the separation of platinum-group metals and other metals was evaluated by batch adsorption and chromatographic separation experiments. THDTODA/SiO₂-P adsorbed Ru(III) and Rh(III) more than (THDTODA + dodecanol)/SiO₂-P did in concentrated HNO₃ solution. From the calculated thermodynamic parameters, dodecanol was considered to have little effect on the temperature dependence of the adsorptions of Ru(III), Zr(IV), Mo(VI), and Re(VII) onto the THDTODA adsorbents. Furthermore, in the results of column chromatography experiments, the effects of dodecanol addition on the separation properties were observed for Ru(III), Zr(IV), and Mo(VI), but little effect was observed for Pd(II) and Re(VII).

Keywords: column chromatography; platinum-group metals; silica-based adsorbent; simulated high-level liquid waste

Corresponding author: Seong-Yun Kim, Department of Quantum Science and Energy Engineering, Graduate School of Engineering, Tohoku University, Sendai, Miyagi 980-8579, Japan, E-mail: sonyun.kimu.d7@tohoku.ac.jp

Author contribution: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
Research funding: None declared.
Conflict of interest statement: The authors declare no conflicts of interest regarding this article.

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Received: 2021-05-31

Revised: 2021-09-26

Accepted: 2021-10-06

Published Online: 2021-10-26

Published in Print: 2021-12-20

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Articles in the same Issue

https://doi.org/10.1515/ract-2021-1060

Keywords for this article

column chromatography; platinum-group metals; silica-based adsorbent; simulated high-level liquid waste