高温で低濃度のヨウ素を効率的に吸収するための化学的に安定したグアニジニウム共性有機フレームワーク
Zhiyuan Zhang1, Xinglong Dong2, Jun Yin2
1School of Materials Science and Engineering, National Institute for Advanced Materials, TKL of Metal and Molecule-Based Material Chemistry, Nankai University, Tianjin 300350, P. R. China.
Journal of the American Chemical Society
|April 5, 2022
まとめ
グアニジニウムベースの新しい共性有機フレームワーク (COF),TGDMは,厳しい産業条件下で放射性ヨウ素 (I2) 蒸気を効率的に捕捉します. TGDMは,核廃棄物の再処理のための現在のシルバーベースの吸着剤と比較して優れた吸収性と安定性を提供します.
科学分野:
- 材料科学
- 化学工学
- 核化学
背景:
- 核廃棄物から放射性ヨウ素 (I2) の蒸気を捕獲することは,高温と低濃度のために困難です.
- 現在の産業用吸着剤は,銀基材料と同様に,核燃料再処理の効率とコストに制限があります.
研究 の 目的:
- 産業用条件下での効率的な放射性I2蒸気の吸収剤を開発する.
- 既存の技術と比較して,新しい吸着剤の性能,安定性,および費用対効果を評価する.
主な方法:
- グアニジニウムベースの共性有機フレームワーク (COF) の合成,TGDMと呼ばれています.
- 150°Cと150ppmvのTGDMのI2吸収能力の特徴
- 吸収メカニズムを理解するための理論的計算
- 化学的および熱的安定性,再利用性,およびコストの評価
主要な成果:
- TGDMは,150°Cと150ppmvのI2で,工業用銀基吸着剤 (例えば17%のAg@MOR) を上回る高いI2吸収率を達成した.
- TGDM内のイオン部位で強いクーロン相互作用によって吸収されます.
- TGDMは,高温,湿度,酸性環境の要件を満たす優れた化学および熱安定性を実証しました.
- この材料は,現在の産業用吸着剤と比較して,優れたリサイクル性と低コスト性を示しています.
結論:
- TGDMは,核燃料再処理における放射性I2蒸気捕獲のための非常に有望な候補である.
- COFに安定したイオングアニジン分子を組み込むことは,高度なI2吸着剤を開発するための実行可能な戦略を提供します.
- TGDMの性能,安定性,コストの利点は,現在の技術の主要な限界に対応しています.
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