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首页> 外文期刊>International Journal of Electrochemical Science >Monitor the Adsorption of Bromine Vapor on Zeolitic- Imidazolate Framework-8 Film by an Electrodeless Quartz Crystal Microbalance in Overtone
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Monitor the Adsorption of Bromine Vapor on Zeolitic- Imidazolate Framework-8 Film by an Electrodeless Quartz Crystal Microbalance in Overtone

机译：通过泛音无极石英晶体微天平监测沸石-咪唑骨架8膜上溴蒸气的吸附

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摘要

In this work, the overtone response of an electrodeless quartz crystal microbalance (EL-QCM) ingaseous phase was investigated by an impedance analysis method. It was shown that the influence ofthe electrode gap on the resonant frequency reduces with increasing overtone number. Althoughreduced with increasing overtone, the effective quality factor is still high enough even at 7th overtone4 (3.80 ) for the stable resonance of the EL-QCM. The EL-QCM was applied to monitor theadsorption processes related to corrosive gas, modeling by bromine vapor onto zeolitic-imidazolateframework-8 (ZIF-8) film. It was shown that the 2-methylimidazole unit in ZIF-8 plays important rolefor Br2 adsorption, preponderating in chemical adsorption. The adsorption kinetic data are inagreement with the pseudo-second-order model. The adsorption isotherms are well fitted by theLangmuir model with the saturation adsorption capacity of 3241 mg/g on ZIF-8 with thickness of0.699 (25). The correlations of the frequency shifts at the overtone (n=1,3,5) can be employed tojudge the rigidity of the film in an adsorption process.
机译：在这项工作中，通过阻抗分析方法研究了无电极石英微天平（EL-QCM）气相的泛音响应。结果表明，电极间隙对谐振频率的影响随着泛音数的增加而减小。尽管随着泛音的增加而降低，但有效的品质因数仍然足够高，即使在第7泛音（3.80）时也能保持EL-QCM的稳定谐振。 EL-QCM用于监测与腐蚀性气体有关的吸附过程，通过溴蒸气在沸石-咪唑盐骨架8（ZIF-8）膜上进行建模。结果表明，ZIF-8中的2-甲基咪唑单元对Br2的吸附起重要作用，在化学吸附中占优势。吸附动力学数据与拟二级模型不一致。吸附等温线由Langmuir模型很好地拟合，在ZIF-8上的饱和吸附容量为3241 mg / g，厚度为0.699（25）。泛音（n = 1,3,5）处的频移相关性可用于判断吸附过程中薄膜的刚度。

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