The role of surface heterogeneity and lateral interactions in the adsorption of volatile organic compounds on rutile surface

Metaxa, E.; Kolliopoulos, A.; Agelakopoulou, T.; Roubani‐Kalantzopoulou, F.

doi:10.1016/j.apsusc.2009.02.035

Cited by 12 publications

(19 citation statements)

References 28 publications

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“…2. From the series of the sample peaks obtained under various conditions, several physicochemical quantities have been determined and published (Agelakopoulou et al, 2009;Arvanitopoulou et al, 1994;Bakaoukas et al, 2005;Floropoulou et al, 2009;Katsanos et al, 1998Katsanos et al, ,2003Katsanos et al, ,2004Metaxa et al, 2009aMetaxa et al, ,2009bMetaxa et al, ,2009cRoubani-Kalantzopoulou, 2004,2009Roubani-Kalantzopoulou et al, 1996;Sotiropoulou et al, 1995). The sample peaks are predicted theoretically by the so-called chromatographic sampling equation 1, which describes the concentration-time curve of the sample peaks created by the flow reversals and has been derived using mass balances, rates of change, etc., and integrating the resulting partial differential equations under given initial and boundary conditions.…”

Section: The Novel Methods Of Rf-igc: Physical Description and Experimmentioning

confidence: 99%

“…where: m is the molecular mass of the adsorbate; k is the Boltzmann's constant; h the Planck's constant; and the ratio u s (T)/b g (T) of two partition functions, namely that of the adsorbed molecule, u s (T), and that for rotations-vibrations in the gas phase b g (T). This ratio is taken as a unity, approximately, as was done before (Agelakopoulou et al, 2009;Arvanitopoulou et al, 1994;Bakaoukas et al, 2005;Floropoulou et al, 2009;Katsanos et al, 1998Katsanos et al, ,2003Katsanos et al, ,2004Metaxa et al, 2009aMetaxa et al, ,2009bMetaxa et al, ,2009cRoubani-Kalantzopoulou, 2004,2009Roubani-Kalantzopoulou et al, 1996;Sotiropoulou et al, 1995). The contribution of lateral molecular interactions in the overall phenomenon of adsorption and desorption is taken into account, by correcting Eq.…”

Section: Mathematical Modelmentioning

confidence: 99%

“…It should be noted that although the majority of the reported results regards experiments done at relatively low temperatures, where physisorption is more expected, the structural materials of samples used (e.g., statues from Museums) are energetically upgraded, as a consequence of the whole process they have been undergone from the moment of their natural formation until the moment of their use as materials for creating statues. Thus, in the presence of an aggressive environment a chemisorption process is favorable; by means of RF-IGC experiments, chemisorption is observed taking place in the beginning of the experiments (Agelakopoulou et al, 2009;Floropoulou et al, 2009;Katsanos et al, 1998Katsanos et al, ,2003Katsanos et al, ,2004Metaxa et al, 2009aMetaxa et al, ,2009bMetaxa et al, ,2009cRoubani-Kalantzopoulou, 2004,2009. Furthermore, any kind of adsorption process (chemisorption or/and physisorption) takes place in different extent, because of the development of molecular lateral interactions (attractive or/and repulsive) between the adsorbed species, in addition to the adsorbent-adsorbate interactions, the latter being the predominant type of forces characterizing chemisorption.…”

Section: The Local Character Of Adsorption In Materials Decay: Chemismentioning

confidence: 99%

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Air Pollution and Cultural Heritage: Searching for “The Relation Between Cause and Effect”

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Pollution of the natural environment is largely unintended and unwanted consequences of human activities in manufacturing, transportation, agriculture and waste disposal. High levels of pollution are largely a consequence of industrialization, urbanization and the rapid increase of human population in modern times. Pollutants are commonly classified according to the part of the environment primarily effected by them, either by air, water or land. Sub-grouping depends on characteristics of the pollutants themselves: chemical, physical, thermal and others. Many pollutants affect more than one resource. The substances that pollute the atmosphere are either gases, finely divided soils, or finely dispersed liquids aerosols. Five major classes of pollutants are discharged into the air: carbon monoxide, sulphur oxides, hydrocarbons, nitrogen oxides and particulates (dust, ash). The principle source of air pollution is the burning of fossil fuels, e.g., coal, oil and derivatives of the latter, such as gasoline, in internal combustion engines or for heating or industrial purposes. The term heritage was used for first time from experts in the early seventies, to declare all the human creation with artistic features, which have been delivered to us as hereditary asset, namely as heritage. At the end of the same decade, the term heritage acquired collective sense and it was used to talk about European Heritage or later about Universal Heritage; in any case to indicate monuments, objects and places. If in a sense culture is the evolution of human life in space and time, the "monumentsremnants" of the human creation of all the times form the prints, the signs, the evidences, the strides of the human-beings progress within the time: "past narrates its history…". Thus, monuments form an undivided entirety with time and place, with man, his surroundings and his history. These unique and unprecedented fingerprints of human civilization form the natural and cultural heritage of a place, of a country, of a people, the peculiar features of a nation which characterize its identity. Cultural heritage is continuously undergoing numerical strains: anthropogenic and natural ones, from which the former can be anticipated or/and prevented, whereas the latter not. The result of these strains is the deterioration of all the materials. In fact, there is no material which is not to be downgraded. The Second Law of Thermodynamics inevitably intervenes and finally results in the deterioration of all the materials. For this reason, materials' deterioration is independent, in practice, on their surroundings and it is taking place in any environment, even without the direct contact of the materials with the constituents of a www.intechopen.com Monitoring, Control and Effects of Air Pollution 154 corrosive environment. Of course, the environment impacts quantitatively the deterioration or corrosion phenomenon taking place, by means of the impact on the rate of the deterioration process(es) and the kind of the produced substances. Air pollution as an ...

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Section: The Novel Methods Of Rf-igc: Physical Description and Experimmentioning

confidence: 99%

Section: Mathematical Modelmentioning

confidence: 99%

Section: The Local Character Of Adsorption In Materials Decay: Chemismentioning

confidence: 99%

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Air Pollution and Cultural Heritage: Searching for “The Relation Between Cause and Effect”

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2011

Monitoring, Control and Effects of Air Pollution

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“…Reversed-flow inverse gas chromatography (RF-IGC) was employed to study the hydrogen adsorption phenomena [37][38][39]. During the measurements, helium was the carrier gas with a 24 cm 3 /min constant volumetric flow rate, 0.5 mL H 2 was the injected reactant at atmospheric pressure, and the volume of the catalytic powder in the diffusion column was 5 cm 3 .…”

Section: Characterization Of the Solution Combustion Synthesized Catamentioning

confidence: 99%

Effects of Precursor Concentration in Solvent and Nanomaterials Room Temperature Aging on the Growth Morphology and Surface Characteristics of Ni–NiO Nanocatalysts Produced by Dendrites Combustion during SCS

et al. 2019

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The morphology and surface characteristics of SCS(Solution Combustion Synthesis)-derived Ni–NiO nanocatalysts were studied. The ΤΕΜ results highlighted that the nanomaterial’s microstructure was modified by changing the reactants’ concentrations. The dendrites’ growth conditions were the main factors responsible for the observed changes in the nanomaterials’ crystallite size. Infrared camera measurements demonstrated a new type of combustion through dendrites. The XPS analysis revealed that the NiO structure resulted in the bridging of the oxygen structure that acted as an inhibitor of hydrogen adsorption on the catalytic surface and, consequently, the activity reduction. The RF-IGC indicated three different kinds of active sites with different energies of adsorption on the fresh catalyst and only one type on the aged catalyst. Aging of the nanomaterial was associated with changes in the microstructure of its surface by a gradual change in the chemical composition of the active centers.

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“…However, subsequently, the application of this method was greatly extended and RFGC was used to investigate the physiochemical properties of samples, such as the rate of coefficients (Karaiskakis & Katsanos 1984;Khalid et al 2012), diffusion coefficients (Atta et al 2002;Karaiskakis & Katsanos 1984;Khalid et al 2011), mass transfer coefficients (Gavril & Karaiskakis 1997;Karaiskakis et al 1986;Katsanos et al 1988), activity coefficients (Agathonos & Karaiskakis 1989a, 1989bKatsanos et al 1985) and kinetic study of oxygen adsorption over supported catalysts (Dimitrios et al 2012). Furthermore, this methods is also applied in separation for the growth phases of microbes (Lainioti et al 2010) and surface studies (Gavril 2010;Metaxa et al 2009). …”

Section: Introductionmentioning

confidence: 99%

Establishment of Physicochemical Measurements of Water Polluting Substances via Flow Perturbation Gas Chromatography

Mohammad¹,

Zain²,

Khan³

et al. 2014

JSM

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The role of surface heterogeneity and lateral interactions in the adsorption of volatile organic compounds on rutile surface

Cited by 12 publications

References 28 publications

Air Pollution and Cultural Heritage: Searching for “The Relation Between Cause and Effect”

Air Pollution and Cultural Heritage: Searching for “The Relation Between Cause and Effect”

Effects of Precursor Concentration in Solvent and Nanomaterials Room Temperature Aging on the Growth Morphology and Surface Characteristics of Ni–NiO Nanocatalysts Produced by Dendrites Combustion during SCS

Establishment of Physicochemical Measurements of Water Polluting Substances via Flow Perturbation Gas Chromatography

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