Scholarlink

<p>The increasing demand for rare earth elements (REEs) necessitates sustainable methods for thorium (Th) removal from REE-containing solutions. This study introduces an interpolymer system of polyacrylic acid (hPAA) and polyethylenimine (hPEI) hydrogels for selective Th(IV) sorption from Ce(III)-containing solutions. The system (hPAA@hPEI, molar ratios X:Y of ionogenic groups) was activated via remote interaction in aqueous media. ICP-AES analysis showed 92% Th(IV) removal at pH 2.65 after 24&#xa0;h from a Th/Ce mixture (initial [Th] = [Ce] = 5.0&#xa0;mg/L), with Th uptake of 4.416&#xa0;mg/g in hPEI (corresponding to a metal-to-ligand M/L ratio of 1:4) and negligible Ce sorption (0.014&#xa0;mg/g). SEM–EDS confirmed 1.95 wt.% Th in hPEI, while FTIR revealed N–H shifts (from 3270 to 3250&#xa0;cm⁻<sup>1</sup>) indicating Th-N coordination. Sorption followed the Langmuir isotherm (q<sub>max</sub> = 5.12&#xa0;mg/g, K<sub>L</sub> = 0.82 L/mg, R<sup>2</sup> = 0.99), indicative of monolayer chemisorption on homogeneous amine sites. The conditional stability constant (log K<sub>c</sub>) was estimated at ~ 5.2, with a detection limit (LOD) of 0.1&#xa0;mg/L. This eco-friendly system offers potential for immobilizing radioactive Th, enhancing REE purification sustainability.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Efficient thorium (IV) removal from cerium-containing solution using hydrogels of polyacrylic acid and polyethylenimine as sustainable interpolymer system

  • 期刊论文

  • 发表日期：

    2025年12月20日

查看全文
  • Ainamgul Utesheva,
  • Talkybek Jumadilov,
  • Juozas Vidas Gražulevičius,
  • Yelemessova Zhanerke,
  • Khaidar Tassibekov,
  • Khimersen Khuangul,
  • Aldan Imangazy

摘要

The increasing demand for rare earth elements (REEs) necessitates sustainable methods for thorium (Th) removal from REE-containing solutions. This study introduces an interpolymer system of polyacrylic acid (hPAA) and polyethylenimine (hPEI) hydrogels for selective Th(IV) sorption from Ce(III)-containing solutions. The system (hPAA@hPEI, molar ratios X:Y of ionogenic groups) was activated via remote interaction in aqueous media. ICP-AES analysis showed 92% Th(IV) removal at pH 2.65 after 24 h from a Th/Ce mixture (initial [Th] = [Ce] = 5.0 mg/L), with Th uptake of 4.416 mg/g in hPEI (corresponding to a metal-to-ligand M/L ratio of 1:4) and negligible Ce sorption (0.014 mg/g). SEM–EDS confirmed 1.95 wt.% Th in hPEI, while FTIR revealed N–H shifts (from 3270 to 3250 cm⁻1) indicating Th-N coordination. Sorption followed the Langmuir isotherm (qmax = 5.12 mg/g, KL = 0.82 L/mg, R2 = 0.99), indicative of monolayer chemisorption on homogeneous amine sites. The conditional stability constant (log Kc) was estimated at ~ 5.2, with a detection limit (LOD) of 0.1 mg/L. This eco-friendly system offers potential for immobilizing radioactive Th, enhancing REE purification sustainability.