沸石结构性质对碘捕获的作用：骨架类型和化学成分的正面评价,ACS Applied Materials & Interfaces

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沸石结构性质对碘捕获的作用：骨架类型和化学成分的正面评价
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2022-04-12 , DOI: 10.1021/acsami.2c01179
Brian J Riley ₁ , Saehwa Chong ₁ , Julian Schmid ₂ , José Marcial ₁ , Emily T Nienhuis ₁ , Mrinal K Bera ₃ , Sungsik Lee ₄ , Nathan L Canfield ₁ , Sungmin Kim ₂ , Miroslaw A Derewinski ₅ , Radha Kishan Motkuri ₁

Affiliation

本研究评估了用于碘气 [I _2(g) ] 捕获的基于沸石的吸附剂。基于骨架结构和孔隙率，对五种沸石进行了I _{2 ( g)}在室温和 150 °C 的碘饱和环境中捕获。^{从这些初步研究中，三种性能最佳的沸石与 Ag +}进行离子交换，并在类似条件下评估了 I _{2(g)捕获。}能量色散 X 射线光谱数据表明 Ag-FAU 框架是 I _{2(g)容量最高的材料}在这项研究中，与室温下的银丝光沸石 (Ag-MOR) 相比，吸附量高约 3 倍，但 X 射线衍射测量表明，由于脱铝，八面沸石结构在吸附研究过程中坍塌。Ag-MFI 沸石在实际应用中是不错的吸附剂，具有良好的吸附能力和更高的稳定性。深入的分析和表征，包括同步加速器 X 射线吸收光谱，揭示了沸石的结构和化学性质对气相碘吸附性能的影响。

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Role of Zeolite Structural Properties toward Iodine Capture: A Head-to-head Evaluation of Framework Type and Chemical Composition

This study evaluated zeolite-based sorbents for iodine gas [I_2(g)] capture. Based on the framework structures and porosities, five zeolites, including two faujasite (FAU), one ZSM-5 (MFI), one mesoMFI, one ZSM-22 (TON), as well as two mesoporous materials, were evaluated for I_2(g) capture at room temperature and 150 °C in an iodine-saturated environment. From these preliminary studies, the three best-performing zeolites were ion-exchanged with Ag⁺ and evaluated for I_2(g) capture under similar conditions. Energy-dispersive X-ray spectroscopy data suggest that Ag-FAU frameworks were the materials with the highest capacity for I_2(g) in this study, showing ∼3× higher adsorption compared to Ag-mordenite (Ag-MOR) at room temperature, but X-ray diffraction measurements show that the faujasite structure collapsed during the adsorption studies because of dealumination. The Ag-MFI zeolites are decent sorbents in real-life applications, showing both good sorption capacities and higher stability. In-depth analyses and characterizations, including synchrotron X-ray absorption spectroscopy, revealed the influence of structural and chemical properties of zeolites on the performance for iodine adsorption from the gas phase.

更新日期：2022-04-12

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