Interdependence of different parameters characterizing the chemistry of an activated carbon surface

Kaźmièrczak, J.; Biniak, S.; Świątkowski, Andrzej; Radeke, K.‐H.

doi:10.1039/ft9918703557

Cited by 36 publications

(13 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…2a the experimentally determined Àh i (H 2 O) values increase in direct proportion to the surface oxygen levels of the CBs which is a marked contrast to the Àh i (Tol) figures. The water values are close to those previously reported for a wide range of carbon blacks of various types and levels of oxidation measured by XPS [19] and are also consistent with studies by other authors based on pH pzc and temperature programmed desorption of oxygen complexes [5,26,27].…”

Section: Resultssupporting

confidence: 80%

Specific and non-specific interactions on non-porous carbon black surfaces

Andreu

Stoeckli

Bradley

2007

Carbon

View full text Add to dashboard Cite

The interactions which occur between methanol, ethanol or propanol and the surfaces of non-porous carbon blacks with increasing levels of oxygen chemistry have been studied using adsorption isotherm analysis and immersion calorimetry. Surface oxygen has been controlled by ozone treatment and characterised using X-ray photoelectron spectroscopy, which gives a direct and quantitative measure of surface composition from first-principles, and has not yet been extensively employed in detailed carbon adsorption studies. Nitrogen adsorption at 77 K and heat of immersion Àh i (mJ m À2 ) data for toluene, show that the physical structure of the carbon blacks is not modified by ozone treatment. A systematic shift to higher adsorption values, due to increasing specific hydrogen bonding interactions between the alcohol -OH groups and surface oxygen, is observed in all of the alcohol isotherms as the total oxygen content of the carbon surfaces ([O] T /at.%) increases. This effect is most significant for methanol confirming that the mechanism of adsorption is dominated by hydrogen bonding and therefore dependant on the surface concentration of oxygen sites. It is also observed for ethanol and propanol but is less marked due to the increasing non-specific, dispersion, interactions of the alkyl chain with the non-polar carbon surface. This description is in agreement with the data obtained for the specific enthalpies of immersion Àh i (mJ m À2) into the alcohols and into water or toluene which allow a semi-quantitative assessment off the relative polar and dispersion contributions to the overall interactions as functions of both carbon surface oxygen composition and the molecular structure of the alcohols. An overall correlation is observed between adsorption behaviour, [O] T /at.%, the resulting Àh i values and the characteristic energy E (kJ mol À1 ) of the DRK equation. It is also observed that the values of the affinity coefficient b DRK increase directly as a function of [O] T indicating that this latter parameter may provide a basis for predicting the adsorption isotherms of certain polar vapours on non-porous carbon surfaces. The effects of carbon surface chemistry on the character of adsorption isotherms, which change from Type III for the base N330 (and for a graphitized carbon black N234G) to Type II for the oxidised N330 materials, is discussed and the resulting effects on the surface area parameters S DRK and S BET (m 2 g À1 ) are considered.

show abstract

Section: Resultssupporting

confidence: 80%

Specific and non-specific interactions on non-porous carbon black surfaces

Andreu

Stoeckli

Bradley

2007

Carbon

View full text Add to dashboard Cite

show abstract

“…Infrared (IR) spectroscopy is another method that has been employed to identify the functional groups present on activated carbon surfaces [59,[169][170][171][172][173][174][175][176]. However, it is not easy to interpret the IR spectra because the peaks obtained are usually a sum of the interactions of different types of groups [67,130,173].…”

Section: Fourier Transform Infrared Spectroscopy (Ft-ir)mentioning

confidence: 99%

A review on surface modification of activated carbon for carbon dioxide adsorption

Shafeeyan

Daud

Houshmand

et al. 2010

Journal of Analytical and Applied Pyrolysis

935

499

View full text Add to dashboard Cite

“…However, there are significant discrepancies in the details of the role of the surface site type and the pore-filling mechanism. It is well known that activated carbons prepared by chemical modification of a surface have a variety of hydrophilic sites, i.e., surface groups such as hydroxyl, carboxyl, quinine, peroxide, aldehyde, and nitrogen-containing or surface cations, in addition to hydrophobic sites comprising the defects of the graphene basal plane layers [3,6,7,9,[13][14][15][16]. Thus, the dependence of the concentration of centers at the carbon surface (so-called primary adsorption sites) on water adsorption at low relative pressures cannot be neglected in studies of initial adsorption data.…”

Section: Introductionmentioning

confidence: 99%

Does the Dubinin–Serpinsky theory adequately describe water adsorption on adsorbents with high-energy centers?

Gauden¹

2005

Journal of Colloid and Interface Science

View full text Add to dashboard Cite

Interdependence of different parameters characterizing the chemistry of an activated carbon surface

Cited by 36 publications

References 5 publications

Specific and non-specific interactions on non-porous carbon black surfaces

Specific and non-specific interactions on non-porous carbon black surfaces

A review on surface modification of activated carbon for carbon dioxide adsorption

Does the Dubinin–Serpinsky theory adequately describe water adsorption on adsorbents with high-energy centers?

Contact Info

Product

Resources

About