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Metal-organic framework and Tenax-TA as optimal sorbent mixture for concurrent GC-MS analysis of C1 to C5 carbonyl compounds

Title
Metal-organic framework and Tenax-TA as optimal sorbent mixture for concurrent GC-MS analysis of C1 to C5 carbonyl compounds
Author
김기현
Keywords
THERMAL-DESORPTION; CHROMATOGRAPHIC SEPARATION; FACILE SYNTHESIS; MOF-5; PRECONCENTRATION; SELECTIVITY; ADSORPTION; CHEMISTRY; ISOMERS; UIO-66
Issue Date
2018-03
Publisher
NATURE PUBLISHING GROUP
Citation
SCIENTIFIC REPORTS, v. 8, Article no. 5033
Abstract
We report a multi adsorbent-based method using combinations of metal-organic frameworks (MOFs) and a commercial sorbent Tenax-TA for sampling and thermal desorption (TD) gas chromatography-mass spectrometry (GC-MS) quantification of mixtures of six (C1 to C5) aldehydes. The feasibility of this approach was demonstrated along with the optical analytical conditions for maximum recovery. Optimal TD conditions for adsorption and desorption of aldehydes using MOF-5 (Zn-based MOF)+ Tenax-TA were determined as -25 degrees C and 150 degrees C, respectively (purge volume: 100ml). These conditions yielded good linearity (R-2=0.997), precision, and high sensitivity. Analysis of the aldehyde mixtures yielded slightly smaller R2 values than the analysis of single species. Additionally, the performance of MOF-5+ Tenax-TA was compared with other combinations comprising of Cu-based MOF-199 and Zr-based MOF of UiO-66 topology. The results of the theoretical modelling analyses propose simultaneous interaction of the C=O group of aldehydes with open metal sites of the studied MOFs and van der Waals interaction of hydrocarbon tail of aldehydes with linkers of MOFs. The combined interactions significantly increased the enthalpy (eV/molecule) of formaldehyde adsorption on MOF. Our findings unravel a potential way to extend the application of GC-based detection toward concurrent analysis of organic molecules of variable sizes.
URI
https://www.nature.com/articles/s41598-018-23391-6http://repository.hanyang.ac.kr/handle/20.500.11754/118082
ISSN
2045-2322
DOI
10.1038/s41598-018-23391-6
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > CIVIL AND ENVIRONMENTAL ENGINEERING(건설환경공학과) > Articles
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