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首页> 外文期刊>Advanced Functional Materials >Preconcentration of Nitroalkanes with Archetype Metal-Organic Frameworks (MOFs) as Concept for a Sensitive Sensing of Explosives in the Gas Phase
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Preconcentration of Nitroalkanes with Archetype Metal-Organic Frameworks (MOFs) as Concept for a Sensitive Sensing of Explosives in the Gas Phase

机译：以原型金属-有机骨架（MOF）为概念的硝基烷的预浓集，用于气相炸药的灵敏检测

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摘要

Thermal desorption based enrichment is a general concept that can enhance any detection system's sensitivity and selectivity. Given their large interior surface area and chemical versatility, archetype metal-organic frameworks (MOFs) are selected for preconcentration of explosives and their precursors occurring in low concentrations, and are compared to the state-of-the-art sorbent Tenax TA. Applying inverse gas chromatography (iGC), this study shows that several archetype MOFs, namely HKUST-1 and MIL-53, surpass Tenax regarding their specific retention volume for nitromethane, a typical ingredient in improvised explosives. Using linear hydrocarbons as reference probe molecules, the dispersive surface energy is determined for all MOFs along with the specific contribution of the nitro group for HKUST-1 and ZIF-8. Trends from pulse-chromatographic iGC-investigations are mostly followed in breakthrough and thermal desorption experiments using a 1000 ppm nitromethane source. In these experiments, HKUST-1 proves the peak substance, with enrichment factors being 109-fold higher than for Tenax, followed by MIL-53. In case of HKUST-1, this factor is successfully reproduced for a 1 ppm concentration scenario. This shows that archetype MOFs can be suitable or even superior candidates for a sensitive sensing of nitroalkane explosives from the gas phase by a concept of preconcentration.
机译：基于热脱附的富集是一个通用概念，可以增强任何检测系统的灵敏度和选择性。鉴于其较大的内部表面积和化学多功能性，我们选择了原型金属有机框架（MOF）来对爆炸物及其低浓度发生的前驱物进行预浓缩，并将其与最新的吸附剂Tenax TA进行比较。应用逆气相色谱（iGC），这项研究表明，几种原型MOF，即HKUST-1和MIL-53，在简易爆炸物的典型成分-硝基甲烷的比保留量方面超过了Tenax。使用线性碳氢化合物作为参考探针分子，可以确定所有MOF的分散表面能以及硝基对HKUST-1和ZIF-8的特定贡献。使用1000 ppm硝基甲烷源的突破和热脱附实验主要遵循脉冲色谱iGC研究的趋势。在这些实验中，HKUST-1证明了物质的最高峰，其富集因子比Tenax高109倍，其次是MIL-53。如果是HKUST-1，则在1 ppm浓度的情况下成功复制了该因子。这表明，通过预浓缩的概念，原型MOF可以适合或什至是更好的候选方案，用于从气相中敏感地检测硝基硝基烷爆炸物。

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