Adsorption of water and microporous structures of carbon adsorbents. Communication 8. Correlation between the parameters of the microporous structure of activated carbons and the constants of the water adsorption isotherm equation

1984 ◽  
Vol 33 (4) ◽  
pp. 683-686
Author(s):  
M. M. Dubinin ◽  
K. M. Nikolaev ◽  
G. A. Petukhova ◽  
N. S. Polyakov
Keyword(s):  
Adsorption Isotherm ◽  
Water Adsorption ◽  
Activated Carbons ◽  
Carbon Adsorbents ◽  
Microporous Structure ◽  
Isotherm Equation ◽  
Adsorption Of Water

scholarly journals Water adsorption by activated carbons in relation to their microporous structure

Carbon ◽  
2003 ◽  
Vol 41 (3) ◽  
pp. 479-486 ◽  
Author(s):  
A.M. Slasli ◽  
M. Jorge ◽  
F. Stoeckli ◽  
N.A. Seaton
Keyword(s):  
Water Adsorption ◽  
Activated Carbons ◽  
Microporous Structure

scholarly journals Modelling of water adsorption by activated carbons: effects of microporous structure and oxygen content

Carbon ◽  
2004 ◽  
Vol 42 (10) ◽  
pp. 1947-1952 ◽  
Author(s):  
A.M Slasli ◽  
M Jorge ◽  
F Stoeckli ◽  
N.A Seaton
Keyword(s):  
Oxygen Content ◽  
Water Adsorption ◽  
Activated Carbons ◽  
Microporous Structure

THE PORE STRUCTURE AND ADSORPTIVE PROPERTIES OF SOME ACTIVATED CHARCOALS: I. THE ADSORPTION OF WATER VAPOUR AND ITS DEPENDENCE ON PORE SIZE

1946 ◽  
Vol 24b (4) ◽  
pp. 109-123 ◽  
Author(s):  
M. N. Fineman ◽  
R. M. Guest ◽  
R. McIntosh
Keyword(s):  
Adsorption Isotherm ◽  
Water Vapour ◽  
Pore Volume ◽  
Water Adsorption ◽  
Capillary Condensation ◽  
Total Pore Volume ◽  
Relative Pressure ◽  
Surface Areas ◽  
Adsorption Of Water ◽  
Adsorptive Properties

An examination of the influence of the structure of charcoal adsorbents on the form of the water adsorption isotherm has been attempted by determinations of (1) surface areas of a series of charcoals of varying degrees of activation using nitrogen and butane as adsorbates; (2) total pore volume of each adsorbent sample by density measurements in helium and in mercury; (3) density of adsorbents when immersed in water; (4) adsorption isotherms for water vapour; and (5) surface areas of charcoals partly saturated with water vapour.The evidence appears to suggest that certain very small and certain very large voids in charcoal are not occupied by water vapour at any value of the relative pressure. The former, 10% by volume, are important in terms of surface area; the latter, 30% by volume, influence pore volume calculations. An explanation of the shape of the water adsorption isotherm is attempted in the light of these facts. Estimates of the submicro, micro, and macro pore sizes show fair agreement when these are based upon either the capillary condensation theory or measurements of the total area and volume of the charcoal pores.

scholarly journals Computer Analysis of the Effect of Activation Temperature on the Microporous Structure Development of Activated Carbon Derived from Common Polypody

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2951
Author(s):  
Mirosław Kwiatkowski ◽  
Jarosław Serafin ◽  
Andy M. Booth ◽  
Beata Michalkiewicz
Keyword(s):  
Activated Carbon ◽  
Porous Structure ◽  
Computer Analysis ◽  
Density Functional ◽  
Activated Carbons ◽  
Chemical Activation ◽  
Geometrical Parameters ◽  
Activation Process ◽  
Microporous Structure ◽  
Activation Temperature

This paper presents the results of a computer analysis of the effect of activation process temperature on the development of the microporous structure of activated carbon derived from the leaves of common polypody (Polypodium vulgare) via chemical activation with phosphoric acid (H3PO4) at activation temperatures of 700, 800, and 900 °C. An unconventional approach to porous structure analysis, using the new numerical clustering-based adsorption analysis (LBET) method together with the implemented unique gas state equation, was used in this study. The LBET method is based on unique mathematical models that take into account, in addition to surface heterogeneity, the possibility of molecule clusters branching and the geometric and energy limitations of adsorbate cluster formation. It enabled us to determine a set of parameters comprehensively and reliably describing the porous structure of carbon material on the basis of the determined adsorption isotherm. Porous structure analyses using the LBET method were based on nitrogen (N2), carbon dioxide (CO2), and methane (CH4) adsorption isotherms determined for individual activated carbon. The analyses carried out showed the highest CO2 adsorption capacity for activated carbon obtained was at an activation temperature of 900 °C, a value only slightly higher than that obtained for activated carbon prepared at 700 °C, but the values of geometrical parameters determined for these activated carbons showed significant differences. The results of the analyses obtained with the LBET method were also compared with the results of iodine number analysis and the results obtained with the Brunauer–Emmett–Teller (BET), Dubinin–Radushkevich (DR), and quenched solid density functional theory (QSDFT) methods, demonstrating their complementarity.

The mechanism of the adsorption of water molecules on carbon adsorbents

1995 ◽  
Vol 64 (11) ◽  
pp. 985-1001 ◽  
Author(s):  
R Sh Vartapetyan ◽  
A M Voloshchuk
Keyword(s):  
Carbon Adsorbents ◽  
Water Molecules ◽  
Adsorption Of Water
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