Capture of nerve agents and mustard gas analogues by hydrophobic robust MOF-5 type metal-organic frameworks
Articolo
Data di Pubblicazione:
2011
Citazione:
Capture of nerve agents and mustard gas analogues by hydrophobic robust MOF-5 type metal-organic frameworks / C. Montoro, F. Linares, E. Quartapelle Procopio, I. Senkovska, S. Kaskel, S. Galli, N. Masciocchi, E. Barea, J.A.R. Navarro. - In: JOURNAL OF THE AMERICAN CHEMICAL SOCIETY. - ISSN 0002-7863. - 133:31(2011 Aug 10), pp. 11888-11891.
Abstract:
In this communication, a series of observations and data analyses coherently confirms the suitability of
the novel metal organic framework (MOF) [Zn4(μ4-O)-(μ4-4-carboxy-3,5-dimethyl-4-carboxy-pyrazolato)3] (1) in the capture of harmful volatile organic compounds (VOCs).
It is worthy of attention that 1, whose crystal structure resembles that of MOF-5, exhibits remarkable thermal,
mechanical, and chemical stability, as required if practical applications are sought. In addition, it selectively captures harmful VOCs (including models of Sarin and mustard gas, which are chemical warfare agents), even in competition with ambient moisture (i.e., under conditions mimicking
operative ones). The results can be rationalized on the basis of Henry constant and adsorption heat values for the different essayed adsorbates as well as H2O/VOC partition coefficients as obtained from variable-temperature reverse gas chromatography experiments. To further strengthen the importance of 1, its performance in the capture of harmful VOCs has been compared with those of well-known materials,
namely, a MOF with coordinatively unsaturated metal sites, [Cu3(btc)2] and the molecular sieve active carbon
Carboxen. The results of this comparison show that coordinatively
unsaturated metal sites (preferential guest-binding sites) are ineffective for the capture of VOCs in the presence
of ambient moisture. Consequently, we propose that the driving force of the VOC MOF recognition process is
mainly dictated by pore size and surface hydrophobicity.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
Chemical Warfare Agents ; Hydrophobic and Hydrophilic Interactions ; Models, Molecular ; Molecular Structure ; Organometallic Compounds ; Volatile Organic Compounds
Elenco autori:
C. Montoro, F. Linares, E. Quartapelle Procopio, I. Senkovska, S. Kaskel, S. Galli, N. Masciocchi, E. Barea, J.A.R. Navarro
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