In Situ Confined Synthesis of a Copper-Encapsulated Silicalite-1 Zeolite for Highly Efficient Iodine Capture,Inorganic Chemistry

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In Situ Confined Synthesis of a Copper-Encapsulated Silicalite-1 Zeolite for Highly Efficient Iodine Capture
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2022-11-25 , DOI: 10.1021/acs.inorgchem.2c03582
Qian Zhao _{1,

2} , Changzhong Liao ₃ , Guangyuan Chen _{1,

2} , Ruixi Liu _{1,

2} , Zeru Wang _{1,

2} , Anhu Xu _{1,

2} , Shiyin Ji _{1,

2} , Kaimin Shih ₄ , Lin Zhu _{1,

2} , Tao Duan _{1,

2}

Affiliation

Effective capture of radioactive iodine is highly desirable for decontamination purposes in spent fuel reprocessing. Cu-based adsorbents with a low cost and high chemical affinity for I₂ molecules act as a decent candidate for iodine elimination, but the low utilization and stability remain a significant challenge. Herein, a facile in situ confined synthesis strategy is developed to design and synthesize a copper-encapsulated flaky silicalite-1 (Cu@FSL-1) zeolite with a thickness of ≤300 nm. The maximum iodine uptake capacity of Cu@FSL-1 can reach 625 mg g^–1 within 45 min, which is 2 times higher than that of a commercial silver-exchanged zeolite even after nitric acid and NO_X treatment. The Cu nanoparticles (NPs) confined within the zeolite exert superior iodine adsorption and immobilization properties as well as high stability and fast adsorption kinetics endowed by the all-silica zeolite matrix. This study provides new insight into the design and controlled synthesis of zeolite-confined metal adsorbents for efficient iodine capture from gaseous radioactive streams.

中文翻译：

原位受限合成铜包覆的 Silicalite-1 沸石以实现高效碘捕获

有效捕获放射性碘对于乏燃料后处理中的净化目的非常重要。具有低成本和对I ₂分子高化学亲和力的铜基吸附剂是消除碘的不错候选者，但低利用率和稳定性仍然是一个重大挑战。在此，开发了一种简便的原位受限合成策略来设计和合成厚度≤300 nm的铜封装片状silicalite-1（Cu@FSL-1）沸石。 Cu@FSL-1的最大吸碘能力可在45分钟内达到625 mg g ^–1 ，即使经过硝酸和NO _X处理，仍比商用银交换沸石高2倍。限制在沸石内的铜纳米颗粒（NP）具有优异的碘吸附和固定性能，以及全二氧化硅沸石基质赋予的高稳定性和快速吸附动力学。这项研究为沸石限制金属吸附剂的设计和控制合成提供了新的见解，以从气态放射性流中有效捕获碘。

更新日期：2022-11-25

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