بررسی عملکرد مایعات یونی ایمیدازولیوم در استخراج و جداسازی فلزات نادر خاکی از محلول آبی

نوع مقاله : مقاله پژوهشی

نویسنده

پژوهشگاه علوم و فنون هسته ای

چکیده

در این مطالعه، مایعات یونی برای استخراج و جداسازی فلزات نادر خاکی سریم، ساماریم، گادولینیم و دیسپروزیم مطالعه و آزمایش شده‌‌اند؛ نتایج نشان داد که مایعات یونی خالص [C6MIM]PF6 و [C6MIM]NTf2 به‌عنوان حلال، بدون استخراج‌کننده قادر به استخراج فلزات نادر خاکی هستند؛ اما میزان درصد استخراج پایین است (54/19% برای استخراج سریم با [C6MIM]PF6 و 11/11% با [C6MIM]NTf2). استفاده از استخراج‌کنندۀ TOPO در این دو مایع یونی موجب افزایش درصد استخراج فلزات شده است (بالاتر از 80% برای استخراج تمامی یون‌ها با ترکیب TOPO و [C6MIM]PF6). از آنجایی که مایعات یونی حلال‌هایی با گرانروی بالا هستند، امکان کاربرد آنها در ستون‌های استخراج مایع- مایع به‌مراتب سخت و مشکل خواهد شد، به همین دلیل ترکیب مایعات یونی به‌همراه TOPO و حلال TBp مطالعه و بررسی شد. نتایج نشان داد که ترکیب سه‌تایی TOPO، TBp و [C6MIM]NTf2 بهتر از ترکیب سه‌تایی با [C6MIM]PF6 است؛ اما در حالت ترکیب دوتایی، مخلوط TOPO و [C6MIM]PF6 برای استخراج یون‌ها مناسب‌تر است. نتایج نشان داد که در کاربردهای پیوسته با حجم زیاد، مخلوط این سه ماده می‌تواند موجب استخراج فلزات نادر خاکی با درصد استخراج بالا شود.

کلیدواژه‌ها


عنوان مقاله [English]

Investigation of Performance of Imidazolium Ionic Liquid in the Extraction and Separation of Rare Earth Elements from Aqueous Solution

نویسنده [English]

  • M. Asadollahzadeh
Nuclear Science and Technology Research Institute
چکیده [English]

In this study, ionic liquids for extraction and separation of rare earth elements such as cerium, samarium, gadolinium and dysprosium have been studied and tested. The results showed that pure ionic fluids [C6MIM]PF6 and [C6MIM]NTf2, as the solvent, could extract rare earth metals without an extractant. But, the extraction efficiency was low (19.54% for cerium extraction with [C6MIM]PF6, and 11.11% with [C6MIM]PF6). The use of TOPO extractant in these ionic liquids led to the higher extraction efficiency (higher than 80% for extraction of ions with a mixture of TOPO and [C6MIM]PF6. Since ionic liquids are high viscosity solvents, their application in liquid-liquid extraction columns will be complicated, so the combination of ionic liquids with TOPO and TBP solvent was studied. The experimental results showed that the mixture of three compounds TOPO, TBP, and [C6MIM]NTf2 was better than the mixture with [C6MIM]PF6. But, in the mixture of two components, TOPO and [C6MIM]PF6 was more appropriate for ion extraction. The result showed in continuous applications with high volume, the mixture of these three substances can lead to the extraction of rare earth metals with a high extraction efficiency.

کلیدواژه‌ها [English]

  • Rare Earth Elements
  • Ionic Liquids
  • Extractant
  • Solvent
  • Imidazolium

 

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