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Detection of Pollutant Gas by the Ionic Liquids Film for Cultural Heritage Preservation

Author: LuDanDan
Tutor: CaiLanKun
School: East China University of Science and Technology
Course: Environmental Science and Engineering
Keywords: Museum Ionic liquids Gas sensor QCM Organic pollutant gas
CLC: TP212.9
Type: Master's thesis
Year: 2012
Downloads: 9
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Abstract


The destruction of volatile organic compounds (VOCs) from wood of show cases in museum, which can cause severe damage to the cultural relics, has been receiving much attention as a problem in the museum. Real-time detection of antique conservation environment is prerequisite to purify gas of the show cases in the museum. Hence, it is necessary to develop the sensitive, real-time, robust and operation simple detection method for organic pollutant gas.In this paper, the ionic liquids film was coated on the silver electrode surface of quartz crystal microbalance (QCM) sensor and employed as sensing film for detection of these organic pollutants. Responses of the QCM sensors coated with the ionic liquids film to different concentrations of these organic pollutants as a function of time were showed in this paper. And some experiments were performed to simulate the dynamic process of the show case as close as possible. Finally, the mechanism of adsorption was discussed combining the IR of ionic liquids.The frequency shifts of the QCM sensor dropped immediately when exposed to the organic pollutants. And after some time the descending trend became smaller, and tended to become steady finally. For the same organic gas, the higher the concentration of the gas is, the bigger the frequency shifts decreased. And the frequency shifts of QCM showed a linear correlation of the concentration of these organic pollutants. The sensor coated with l-hexyl-3-methylimidazolium chloride showed more sensitive to the organic pollutants, which can detect lower concentration of the organic gases. Within the range of experimental concentrations, it could be deduced that the sensitivity of the sensors coated with l-hexyl-3-methylimidazolium chloride for these organic pollutants was as follows: the acetic acid gas >the formic gas>the formaldehyde gas. Combined with the IR, strong intermolecular interactions such as hydrogen-bonding were found in l-hexyl-3-methylimidazolium chloride and l-butyl-3-methylimidazolium-(sodium p-toluene sulfonate), which can provide good absorbability of the organic pollutants.

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