Removal of Ammonia Emissions via Reversible Structural Transformation in M(BDC) (M = Cu, Zn, Cd) Metal-Organic Frameworks
Removal of Ammonia Emissions via Reversible Structural Transformation in M(BDC) (M = Cu, Zn, Cd) Metal-Organic Frameworks
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通过 M(BDC)（M = Cu、Zn、Cd）金属有机框架中的可逆结构转变去除氨排放
DOI：
10.1021/acs.est.9b06866
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发表时间：
2020-03-17
影响因子：
11.4
通讯作者：
Li, Jinping
中科院分区：
文献类型：
--
作者：
Chen, Yang;Du, Yadan;Li, Jinping
NH3是最重要的气态碱性污染物，当其在高浓度下积累时会对动物和人类健康产生严重影响。更重要的是，NH3排放会与酸性污染气体反应，在大气中形成颗粒物（PM2.5），对人类活动也构成巨大威胁。使用吸附剂从排放源或空气中去除NH3是一个紧迫的问题。然而，大多数常规吸附剂在高吸附容量和可回收性之间的相容性方面存在困难。在这项工作中，提出了一种使用金属有机框架（MOFs）的结构转换策略，用于大规模和可回收的NH3吸附。一系列的M（BDC）（M = Cu，Zn，Cd）材料在吸附NH3后均能转变为一维的M（BDC）（NH3）（2），其重复吸附容量分别为17.2，14.1和7.4mmol/g。这些MOFs可以在250 ℃下完全再生80分钟，没有吸附容量损失。此外，穿透和循环试验表明，铜（BDC）和锌（BDC）表现出良好的性能，从空气中去除低浓度的NH3。总体而言，由于可逆的结构转变，结合了高吸附容量和可回收性的优点，Cu（BDC）和Zn（BDC）可以作为去除NH3的理想候选吸附剂。
NH3 is the most important gaseous alkaline pollutant, which when accumulated at high concentrations can have a serious impact on animal and human health. More importantly, NH3 emissions will react with acidic pollutant gases to form particulate matter (PM2.5) in the atmosphere, which also poses a huge threat to human activities. The use of adsorbents for NH3 removal from emission sources or air is an urgent issue. However, there are difficulties in the compatibility between high adsorption capacity and recyclability for most conventional adsorbents. In this work, a structural transformation strategy using metal-organic frameworks (MOFs) is proposed for large-scale and recyclable NH3 adsorption. A series of M(BDC) (M = Cu, Zn, Cd) materials can transform into one-dimensional M(BDC)(NH3)(2) after NH3 adsorption, resulting in repeatable adsorption capacities of 17.2, 14.1, and 7.4 mmol/g, respectively. These MOFs can be completely regenerated at 250 degrees C for 80 min with no adsorption capacity loss. Besides, breakthrough and cycle tests indicate that Cu(BDC) and Zn(BDC) show good performance in the removal of low concentrations of NH3 from the air. Overall, combining the advantages of high adsorption capacity and recyclability due to the reversible structural transformation, Cu(BDC) and Zn(BDC) can be employed as ideal adsorbent candidates for NH3 removal.