Abstract
Mesoporous silica with KIT-6 structure was investigated as a preconcentrating material in chromatographic systems for ammonia and trimethylamine. Its adsorption capacity was compared to that of existing commercial materials, showing its increased adsorption power. In addition, KIT-6 mesoporous silica efficiently adsorbs both gases, while none of the employed commercial adsorbents did. This means that KIT-6 Mesoporous silica may be a good choice for integrated chromatography/gas sensing micro-devices.
Highlights
Mesoporous materials are proved to be good candidates for gas sensing purposes as well as for many other applications such as environmentally friendly fuels [1], new generation optical devices [2], biochemical separations, bioactivity control for medical applications [3], catalytic adsorption, and molecular sieves [4,5,6], which have been reported so far
For NH3, as shown in Fig. 4, results are even more interesting since the preconcentration power of KIT-6 is about 15 times larger than that of Carboxen 569. These findings reveal that both commercial materials can preconcentrate both TMA and ammonia, none of them is as effective as KIT-6, which shows a high adsorption/desorption when exposed to these gases
Our observations show that if the total assembly is designed accurately, the problem of KIT-6 is minimized as the total amount of the material needed for preconcentration is quite low thanks to its excellent gas-adsorption properties
Summary
Mesoporous materials are proved to be good candidates for gas sensing purposes as well as for many other applications such as environmentally friendly fuels [1], new generation optical devices [2], biochemical separations, bioactivity control for medical applications [3], catalytic adsorption, and molecular sieves [4,5,6], which have been reported so far. Keywords Ammonia Á Trimethylamine Á KIT-6 Á Mesoporous silica Á Preconcentration Á Desorption Nanoscale Res Lett (2009) 4:1303–1308 the first results on the application of KIT-6 silica for adsorption/desorption of ammonia (NH3) and trimethylamine (TMA), which can be employed in integrated gaschromatographic systems [18].
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