Effect of metal additives on the physico-chemical characteristics of activated carbon exemplified by benzene and acetic acid adsorption

Chiang, Hung‐Lung; Huang, C. P.; Chiang, Pen‐Chi; You, J. H.

doi:10.1016/s0008-6223(99)00097-4

Cited by 34 publications

(17 citation statements)

References 12 publications

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“…The increase of the temperature negatively influenced the adsorption capacity of the adsorbents due to desorption of the molecules of the interface (increase of the solubility of the acids in aqueous solution). Similar behavior of the concentration and temperature effects were observed by other authors [16,[18][19][20][21][22][23].…”

Section: Adsorption Experimentssupporting

confidence: 88%

Thermodynamic study of fatty acids adsorption on different adsorbents

Freitas

Mendes

Coelho

2007

The Journal of Chemical Thermodynamics

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Section: Adsorption Experimentssupporting

confidence: 88%

Thermodynamic study of fatty acids adsorption on different adsorbents

Freitas

Mendes

Coelho

2007

The Journal of Chemical Thermodynamics

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“…Among the different VOCs, many studies have dealt with benzene and toluene removal at low concentration by activated carbons (ACs) (Benkhedda et al 2000;Bouhamra et al 2009;Cal et al 1994;Cal et al 1996;Cal et al 1997;Chiang et al 1999;Chiang et al 2001;Chiang et al 2001b;Chiang et al 2002;Dimotakis et al 1999;Foster et al 1992;Huang et al 2002;Huang et al 2003;Noll et al 1989;Ryu et al 2002;Shin et al 2002;Yun et al 1998;Yun et al 1999). Although these papers analysed different carbonaceous materials, no clear conclusions were established about the activated carbon parameters controlling VOC adsorption capacities at low concentrations.…”

Section: Introductionmentioning

confidence: 99%

Benzene and toluene adsorption at low concentration on activated carbon fibres

2010

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The present study analyses the preparation of activated carbon fibres (ACFs) by the so-called "physical" activation method with steam or carbon dioxide and their application for benzene and toluene adsorption at low concentration (200 ppmv). ACFs have been scarcely studied for the adsorption of these pollutants at low concentration in gaseous phase, despite their interesting features regarding adsorption kinetics, bed pressure drop, possibility of conformation and others. Our results have shown that the preparation method used is suitable to produce ACFs with high adsorption capacities for benzene and toluene at the low concentration used. The fibre morphology of the ACFs does not enhance their performance, which results to be similar to other non-fibrous activated carbons such as granular, pellets and powders. Such good performance of the ACFs, leading to benzene and toluene adsorption capacities as large as 31 g benzene/100 g ACF or 53 g toluene/100 g ACF, can be explained due to their large volume of narrow micropores (<0.7 nm) developed upon activation and their low content in surface oxygen groups. Our results have also shown very good agreement between the adsorption results derived from dynamic adsorption experiments and from adsorption isotherms. As the relative pressure of the organic compound increases the corresponding fraction of narrow micropore volumes filled by benzene and toluene increases. For a given low and comparable relative pressure, toluene always occupies a larger fraction of narrow micropores than benzene.

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“…The area of the low temperature peak decreases Table 4 Comparison between Rb/C and K/C quality radios from XPS and ICP analyses. [26], are the highest. Compared to that in Rb-K/AC, the shift in T max to lower temperature clearly indicates that the basic sites of the AC enhance the surface basicity.…”

Section: Surface Basicity Of the Carbon-supported Rb-k Catalystsmentioning

confidence: 96%