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


 

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