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231224s2011 xx |||||o 00| ||eng c |
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|a 10.1021/la2025457
|2 doi
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|a pubmed24n0709.xml
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|a DE-627
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|a eng
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|a Finkelstein-Shapiro, Daniel
|e verfasserin
|4 aut
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|a Identification of binding sites for acetaldehyde adsorption on titania nanorod surfaces using CIMS
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|c 2011
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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|a ƒa Online-Ressource
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|2 rdacarrier
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|a Date Completed 24.04.2012
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|a Date Revised 25.11.2016
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a © 2011 American Chemical Society
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|a The interaction of acetaldehyde with TiO(2) nanorods has been studied under low pressures (acetaldehyde partial pressure range 10(-4)-10(-8) Torr) using chemical ionization mass spectrometry (CIMS). We quantitatively separate irreversible adsorption, reversible adsorption, and an uptake of acetaldehyde assigned to a thermally activated surface reaction. We find that, at room temperature and 1.2 Torr total pressure, 2.1 ± 0.4 molecules/nm(2) adsorb irreversibly, but this value exhibits a sharp decrease as the analyte partial pressure is lowered below 4 × 10(-4) Torr, regardless of exposure time. The number of reversible binding sites at saturation amounts to 0.09 ± 0.02 molecules/nm(2) with a free energy of adsorption of 43.8 ± 0.2 kJ/mol. We complement our measurements with FTIR spectroscopy and identify the thermal dark reaction as a combination of an aldol condensation and an oxidative adsorption that converts acetaldehyde to acetate or formate and CO, at a measured combined initial rate of 7 ± 1 × 10(-4) molecules/nm(2) s. By characterizing binding to different types of sites under dark conditions in the absence of oxygen and gas phase water, we set the stage to analyze site-specific photoefficiencies involved in the light-assisted mineralization of acetaldehyde to CO(2)
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Research Support, U.S. Gov't, Non-P.H.S.
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|a Air Pollutants
|2 NLM
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|a Formates
|2 NLM
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|a Water
|2 NLM
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|a 059QF0KO0R
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|a formic acid
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|a 0YIW783RG1
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|a Carbon Dioxide
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|a 142M471B3J
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|a titanium dioxide
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|a 15FIX9V2JP
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|a Carbon Monoxide
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|a 7U1EE4V452
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|a Titanium
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|a D1JT611TNE
|2 NLM
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|a Acetaldehyde
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|a GO1N1ZPR3B
|2 NLM
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|a Acetic Acid
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|a Q40Q9N063P
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|a Oxygen
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|a S88TT14065
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|a Buchbinder, Avram M
|e verfasserin
|4 aut
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|a Vijayan, Baiju
|e verfasserin
|4 aut
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|a Bhattacharyya, Kaustava
|e verfasserin
|4 aut
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|a Weitz, Eric
|e verfasserin
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|a Geiger, Franz M
|e verfasserin
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|a Gray, Kimberly A
|e verfasserin
|4 aut
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1999
|g 27(2011), 24 vom: 20. Dez., Seite 14842-8
|w (DE-627)NLM098181009
|x 1520-5827
|7 nnns
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|g volume:27
|g year:2011
|g number:24
|g day:20
|g month:12
|g pages:14842-8
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|u http://dx.doi.org/10.1021/la2025457
|3 Volltext
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