Impact of surface characteristics of activated carbon on adsorption of BTEX

Daifullah, A.A.M.; Girgis, Badie S.

doi:10.1016/s0927-7757(02)00392-8

Cited by 229 publications

(145 citation statements)

References 28 publications

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“…Thus, it can be clearly seen that AC 3 had more micropores than the other two supports, whereas the AC 1 support had the highest number of mesopores. The large surface area and pore volume of all the three supports contributed to their efficient adsorption of BTX and increased the dispersion of supported active species (Daifullah and Girgis et al, 2003;Gaur et al, 2006;Zhao et al, 2007). However, Pd/AC 1 had the highest activity ( Fig.…”

Section: Physical Characterization Of Ac Supportsmentioning

confidence: 97%

In situ adsorption-catalysis system for the removal of o-xylene over an activated carbon supported Pd catalyst

Huang

Zhang

2009

Journal of Environmental Sciences

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An activated carbon (AC) supported Pd catalyst was used to develop a highly efficient in situ adsorption-catalysis system for the removal of low concentrations of o-xylene. In this study, three kinds of Pd/AC catalysts were prepared and tested to investigate the synergistic efficiency between adsorption and catalysis for o-xylene removal. The Pd/AC catalyst was first used as an adsorbent to concentrate dilute o-xylene at low temperature. After saturated adsorption, the adsorbed o-xylene was oxidized to CO 2 and H 2 O by raising the temperature of the catalyst bed. The results showed that more than 99% of the adsorbed o-xylene was completely oxidized to CO 2 over a 5% Pd/AC catalyst at 140°C. Brunauer-Emmett-Teller (BET) analysis, scanning electron microscopy (SEM), temperatureprogrammed desorption (TPD), and temperature-programmed oxidation (TPO) were applied to investigate the physical properties of o-xylene adsorption-desorption and the in situ adsorption-catalysis activity of the AC support and Pd/AC catalyst. A synergistic relationship between the AC support and the active Pd species for the removal of low concentrations of o-xylene was established.

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Section: Physical Characterization Of Ac Supportsmentioning

confidence: 97%

In situ adsorption-catalysis system for the removal of o-xylene over an activated carbon supported Pd catalyst

Huang

Zhang

2009

Journal of Environmental Sciences

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“…The surface texture of the AC was captured with a scanning electron microscope (SEM) (Gong et al, 2009) (S-3000N;Hitachi Ltd., xx, xx, Japan). AC surface groups were tested with a Fourier infrared spectrometer (NEXUS670; Nicolet Company, xx, xx, USA) (Lu et al, 2007;Cosnier et al, 2005), and their content was analyzed with Boehm titration (Daifullah et al, 2003).…”

Section: Adsorbent and Adsorbatementioning

confidence: 99%

Effects of activated carbon surface properties on the adsorption of volatile organic compounds

Sun

et al. 2012

Journal of the Air & Waste Management Association

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Physical and chemical properties of activated carbon (AC) were analyzed to investigate the effects of adsorbate properties on AC adsorption performance. Fixed-bed adsorption experiments were conducted with toluene, acetone, and xylene as adsorbates. From the results, the adsorption capacities of the three adsorbates had the following order: xylene > toluene > acetone. The correlation between experimental data and adsorbate properties was also analyzed. The results showed that different functional groups corresponding to the properties of adsorbates influenced the adsorptive properties of AC differently. The adsorption capacity of AC increased linearly as the molecular weight, dynamic diameter, boiling point, and density of the adsorbate increased. However, adsorption capacity decreased as the polarity index and vapor pressure of the adsorbate increased. For adsorption onto three types of AC, the adsorption energies of the three adsorbates had the following order: xylene > toluene > acetone.Implications: This paper focused on the research on adsorption behavior of activated carbon based on adsorbate properties. Adsorption experiments were conducted under the same condition while the adsorbates were toluene, acetone, and xylene, respectively. Correlation analysis between experimental data and adsorbate properties was conducted. The different groups have different influence on the adsorptive properties of ACs. The adsorption capacity of activated carbon increases with the increase of adsorbate molecular weight, dynamic diameter, boiling point, and density, and that this relationship is linear. The relationship between adsorption capacity and the polarity index and vapor pressure of adsorbate shows an opposite trend, and the adsorption capacities and adsorption energies of three kinds of activated carbon for these three adsorbates had the following order: xylene > toluene > acetone.

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“…On the other hand, the adsorption can rely on the number and type of substitute group on benzene ring. They play an important role with steric hindered groups (i.e., -CH 3 or -CH 2 CH 3 ) which contribute to increase the distance between the plane of the ring and surface of the adsorbent (Daifullah and Girgis 2003) and also protect different type of compounds to interact with active sites within the deepest of adsorbent (micropore). Therefore, the compounds have more chance to be adsorbed on the active site by non-specific attraction (van der Waal force).…”

Section: Comparison Of Diffusion Bottlesmentioning

confidence: 99%

“…The inorganic part presents the ability to adsorb ions, while the organic part presents the ability to nonpolar organic compounds (RojasMayorga et al 2014). The activated carbon has been reported to possess high affinity to adsorb BTEX compounds (Daifullah and Girgis 2003). Relatively high molecular compounds (i.e., BTEX and toluene-d8) could thus pass easily through the pore and physically adsorb on the active site of LM-CBC.…”

Section: Comparison Of Diffusion Bottlesmentioning

confidence: 99%

Development of low-cost passive sampler from cow bone char for sampling of volatile organic compounds

Tala

Chantara

Thiansem

et al. 2016

Int. J. Environ. Sci. Technol.

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A simple and low-cost passive sampler for collection of volatile organic compounds, specifically benzene, toluene, ethylbenzene and xylene (BTEX), from the ambient air has been developed by using cow bone char (CBC) as an adsorbent with desorption by solvent extraction prior to analysis by gas chromatography-mass spectrometry (GC-MS). The laboratory-made CBC was prepared by calcination process in a partially oxidative atmosphere. The developed passive sampler was tested for a suitable amount of CBC used, diffusion tube type and size, and sampling duration, in a closed chamber saturated with each of the BTEX vapors. With the optimum amount of 250 mg CBC packed in a glass bottle (82.6 mm height 9 11.1 mm i.d.) and the exposure time of 168 h, detection limits (lg/m 3 ) for BTEX determination using this developed sampler together with GC-MS were 0.28 (benzene), 0.79 (toluene), 0.58 (ethylbenzene), 0.28 (p-xylene) and 0.54 (o-xylene). The proposed method was applied to sampling BTEX from selected petrol stations, traffic congestion areas and a rural area in Chiang Mai Province, Thailand. The BTEX concentrations detected were well correlated with their sources as they were the highest at the petrol station sites, lower at the traffic congestion area sites and the lowest at the rural area site. The laboratory-made passive sampler containing CBC has thus opened up a possibility of having a simple and effective device for sampling of BTEX in the ambient air.

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Impact of surface characteristics of activated carbon on adsorption of BTEX

Cited by 229 publications

References 28 publications

In situ adsorption-catalysis system for the removal of o-xylene over an activated carbon supported Pd catalyst

In situ adsorption-catalysis system for the removal of o-xylene over an activated carbon supported Pd catalyst

Effects of activated carbon surface properties on the adsorption of volatile organic compounds

Development of low-cost passive sampler from cow bone char for sampling of volatile organic compounds

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