Surface reactivities of polynuclear aromatic adsorbates on alumina and silica particles using infrared photoacoustic spectroscopy

Saucy, Daniel A.; Cabaniss, George E.; Linton, Richard W.

doi:10.1021/ac00281a022

Cited by 12 publications

(6 citation statements)

References 16 publications

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“…The silica particles are spherical and nonporous, so only a strong chemisorption between SiOH groups and PAH molecules will explain these results. Similar findings were recently reported by Saucey et al (42).…”

Section: Resultssupporting

confidence: 93%

Ultrafine particles as trace catchers for polycyclic aromatic hydrocarbons: the photoelectric aerosol sensor as a tool for in situ sorption and desorption studies

Nießner¹,

Wilbring²

1989

Anal. Chem.

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The adsorption, condensatlon, and desorption behavior of polycycllc aromatlc hydrocarbons (PAHs) on the surface of ultraflne partlcles has been studied. Four different klnds of monodisperse prlmary partlcles-carbon, sodium chlorkle, aluminum oxide, and Aerosll 200-were subjected to PAH adsorptbn under well-defined conditions. The photoelectric a e r d sensor was used as a sendtlve technique for "In Snu" and "on-llne" detection of the degree of surface coverage of the particles by PAHs. The results were controlled by fluorometrlc determination o f the PAH amount from aerosol filter samples taken In parallel. The affinity of the PAHs to the partlcle material decreased from carbon to sodium chlorlde to aluminum oxlde and had Its mlnlmum for Aerosil 200. I n the second part of the study the thermal desorptlon of the adsorbed PAHs was investlgated by appHcatlon o f a thermodenuder technique. From all partlcle materlals tested the PAHs wlth the largest ring system desorbed at the hlghest temperature. By the study of a single PAH compound on the dlfferent carrler aerosols, It was demonstrated that the temperature necessary for desorptbn decreased in the sequence Aerosll200 > alwnlnum oxlde > NaCl = carbon. I n case of aluminum oxide and Aerosil200 a strong chemisorption of the PAHs Is supposed to be the reason for the differences in the observed desorption temperatures.

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Section: Resultssupporting

confidence: 93%

Ultrafine particles as trace catchers for polycyclic aromatic hydrocarbons: the photoelectric aerosol sensor as a tool for in situ sorption and desorption studies

Nießner¹,

Wilbring²

1989

Anal. Chem.

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“…Instead of three there are only two peaks in the Vis region ͑at 432 and 461 nm͒ of almost equal magnitudes. The minor redshift observed for the strongest band ͑as already observed with PAHs coated on alumina 17 ͒, as well as the change in the peak intensity ratio, could be indicative for a stronger substrate-PAH interaction. The evidence for unchanged structure in the UV region might be in favor of the assumed interaction.…”

Section: Resultsmentioning

confidence: 82%

Photoacoustic study of airborne and model aerosols

Alebić-Juretić¹,

Zetzsch

Dóka

et al. 2003

Review of Scientific Instruments

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Airborne particulates of either natural or anthropogenic origin constitute a significant portion of atmospheric pollution. Environmental xenobiotics, among which are polynuclear aromatic hydrocarbons ͑PAHs͒ and pesticides, often adsorb to aerosols and as such are transported through the atmosphere with the physicochemical properties of the aerosols determining the lifetime of these organic compounds. As an example, the resistance of some PAHs against the photolysis is explained by the effect of the aerosol's ''inner filter'' that reduces the intensity of incident light reaching the mineral particles. On the other hand, some constituents of the aerosols can act as catalytic and/or stoichiometric reagents in atmospheric reactions on the solid surfaces. In the study described here the photoacoustic ͑PA͒ spectroscopy in the UV-Vis was used to investigate natural and model aerosols. The PA spectra obtained from coal and wood ashes and of Saharan sand, all three representatives of airborne aerosols, provide the evidence for the existence of the ''inner filter.'' Furthermore, valuable information about the different nature of the interaction between the model aerosols and adsorbed organics ͑e.g., PAH-pyranthrene and silica, alumina, and MgO͒ has been obtained. Finally, the outcome of the study conducted with powdered mixtures of chalk and black carbon suggests that the PA method is a candidate method for determination of carbon content in stack ashes.

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“…Ando et al have described structural studies of hydrogen and/or oxygen chemisorption on the surface of diamond powders [82]. PAS in the area of IR has been applied for the investigations of silica [83,84], nanoporous SiO x thin films [85,86], reactions of TCl 4 and Me 3 Al with silica surface [87], adsorption of organics on silica and alumina [88,89]. Following applications were connected with the adsorption of organophosphorus compounds on MgO [90], non-stoichiometry cerium oxide-based catalysts [91,92], acidity and the nature of acid sites of sulphated zirconia [93], PA reflection-absorption spectroscopy (PARAS) for IR analysis of thin films on metal surfaces [94], studies of adsorbed species on fine particle of metal and metal oxide [95], kinetic studies of the water-gas shift reaction in the presence of a-Fe 2 O 3 [96], the interaction of gamma-iron oxide powder with organics [97], structural investigations of synthetic ferrihydrite nanoparticles doped with Si [98], nondestructive testing of copper corrosion layer formed in the atmosphere [99].…”

Section: Spectroscopic Investigationsmentioning

confidence: 99%

Application of infrared photoacoustic spectroscopy in catalysis

Ryczkowski

2007

Catalysis Today

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Surface reactivities of polynuclear aromatic adsorbates on alumina and silica particles using infrared photoacoustic spectroscopy

Cited by 12 publications

References 16 publications

Ultrafine particles as trace catchers for polycyclic aromatic hydrocarbons: the photoelectric aerosol sensor as a tool for in situ sorption and desorption studies

Ultrafine particles as trace catchers for polycyclic aromatic hydrocarbons: the photoelectric aerosol sensor as a tool for in situ sorption and desorption studies

Photoacoustic study of airborne and model aerosols

Application of infrared photoacoustic spectroscopy in catalysis

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