نوع مقاله: مقاله پژوهشی
نویسندگان
پژوهشکده‌ی مواد و سوخت هسته‌ای، پژوهشگاه علوم و فنون هسته‌ای، سازمان انرژی اتمی ایران
چکیده
(با عرض پوزش به علت اشکال پیش آمده در فرمول نویسی، اصل چکیده را از فایل pDF مقاله مطالعه فرمایید)
جداسازی زیرکنیم و نیوبیم از لانتانیدها در محیط هیدروکلریک اسید و انتقال انتخابی آن‌ها از طریق غشای مایع توده‌ای مورد بررسی آزمایشگاهی قرار گرفت. تری‌بوتیل فسفات (TBP)، تری- ان- اکتیل آمین (TNOA) و دی بنزو-18- کراون- 6 (؟) رقیق شده در کروزن و بنزن به عنوان حامل به کار گرفته شدند. اثرات عامل‌های مختلف مانند غلظت هیدروکلریک اسید در محلول‌های خوراک و بازیابی (عریان‌ساز)، نوع و غلظت حامل (TNOA، TBP و ?) در فاز غشا، بر روی فرایندهای جداسازی و انتقال زیرکنیم (IV) و نیوبیم (V) مورد بررسی قرار گرفتند. استخراج زیرکنیم (IV) و نیوبیم (V) از محلول هیدروکلریک اسید 9 مولار به درون فاز غشاء با باقی گذاشتن لانتانیدها در محلول خوراک به وسیله‌ی تری‌بوتیل فسفات (TBP) %30 حجمی در کروزن فراهم شد. هیدروکلریک اسید 0.5 مولار، بازیابی کمٌی زیرکنیم (IV) و نیوبیم (V) را فراهم نمود. به علاوه، مطالعه‌ی سینتیک انتقال نشان داد که روند انتقال نیوبیم (V)، سینتیک کمی سریع‌تر از سینتیک زیرکنیم (IV) ارایه می‌دهد. سینتیک انتقال زیرکنیم (IV) و نیوبیم (V) با فرض یک واکنش متوالی مرتبه‌ی دوم برگشت‌ناپذیر مورد بررسی قرار گرفت. مشخص شد که ثابت سرعت انتقال نیوبیم (V) از فاز دهنده به فاز غشا و از غشا به فاز پذیرنده، به ترتیب، حدود 98 و 24 درصد بزرگ‌تر از ثابت سرعت انتقال زیرکنیم (IV) است.
کلیدواژه‌ها
عنوان مقاله [English]
Separation and Selective Transport of Zirconium (IV) and Niobium (V) from Hydrochloric Media Through a Bulk Liquid Membrane
نویسندگان [English]
- S A. Milani
- A Charkhi
- S Eshghi
Materials and Nuclear Fuel Research School, Nuclear Science and Technology Research Institute, AEOI
چکیده [English]
The separation of zirconium and niobium from lanthanides in hydrochloric medium and the selective transport of them via bulk liquid membrane (BLM) was examined. Tri-n-butyl phosphate (TBP), tri-n-octylamine (TNOA) and dibenzo-18-crown-6 (DBC 6) diluted in kerosene and benzene were used as a carrier. The various effects on the transport and separation of zirconium (IV) and niobium (V) were studied: concentration of hydrochloric acid in the feed and strip solutions, type and concentration of the carrier (TBP, TNOA, DBC 6) in the membrane phase. The extraction of zirconium (IV) and niobium (V) in the membrane phase from 9.0 M hydrochloric acid by 30% (v/v) TBP was achieved by leaving lanthanides in the feed solution. The quantitative recovery of zirconium (IV) and niobium (V) were achieved by 0.5 M HCl. Furthermore, the transport kinetics study showed that niobium transport process exhibits slightly faster kinetics than zirconium.The kinetics of Zr(IV)/Nb(V) transport were investigated assuming a consecutive, irreversible second-order reaction on the interfaces. It was found that the rate constant of niobium (V) transport from the donor phase-to-the membrane and from the membrane to the acceptor phase was, respectively, about 98 and 24% more than the zirconium (IV) transport rate constant.
کلیدواژه‌ها [English]
- Separation
- Selective transport
- Bulk liquid membrane (BLM)
- Hydrochloric medium
- TBP
- TNOA
- 18-DBC- 6
- Niobium
- Zirconium
- Kinetics
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