Adsorption from solutions on solid surfaces. Effects of surface heterogeneity on adsorption isotherms and heats of immersion

1981 ◽  
Vol 77 (11) ◽  
pp. 2577 ◽  
Author(s):  
Władysław Rudziński ◽  
Stanisław Partyka
Keyword(s):  
Adsorption Isotherms ◽  
Surface Heterogeneity ◽  
Solid Surfaces ◽  
Adsorption From Solutions ◽  
Heats Of Immersion

scholarly journals Carbon Dioxide Capture in Homogeneous and Heterogeneous Surfaces of Porous Silica Glass

Processes ◽  
2020 ◽  
Vol 8 (10) ◽  
pp. 1260
Author(s):  
Chontira Boonfung ◽  
Chaiyot Tangsathitkulchai ◽  
Atichat Wongkoblap
Keyword(s):  
Carbon Dioxide ◽  
Functional Groups ◽  
Adsorption Isotherms ◽  
Silica Glass ◽  
Surface Defects ◽  
Porous Silica ◽  
Surface Heterogeneity ◽  
Slit Pore ◽  
Porous Silica Glass ◽  
Carbon Dioxide Co2

Experimental and simulation studies for carbon dioxide (CO2) adsorption on porous silica glass were performed to reveal how surface heterogeneity can affect the adsorption mechanism of CO2. In performing the simulation, the structure of porous silica glass was modeled as a slit pore consisting of parallel walls of connected SiO4 units. The adsorption isotherms of CO2 at 283 K were generated for a series of pore widths using a Monte Carlo ensemble. The defective surfaces created by random removal of surface atoms and the surfaces containing hydroxyl functional groups were chosen to represent the surface heterogeneity for the simulation tasks. The isotherms derived for the defective surfaces showed a rapid adsorption at low pressures because of the stronger interaction between the rough nonuniform surfaces and CO2 molecules. For the role of surface functional groups, the adsorption isotherms dramatically increased with an increasing number of functional groups. The amount of CO2 adsorbed for randomly placed functional groups was greater than that for the presence of functional groups at the pore edges. The proper control of surface heterogeneity by manipulating both the amounts of hydroxyl surface groups and surface defects should help enhance the efficient capture of CO2 in porous silica glass.

BET Adsorption Isotherm and Surface Heterogeneity

1992 ◽  
Vol 57 (6) ◽  
pp. 1201-1209
Author(s):  
Lydia Ethel Cascarini de Torre ◽  
Eduardo Jorge Bottani
Keyword(s):  
Distribution Function ◽  
Adsorption Isotherm ◽  
Statistical Mechanics ◽  
Adsorption Isotherms ◽  
Surface Heterogeneity ◽  
Adsorption Energies ◽  
Multilayer Formation ◽  
Effect Of Surface

The BET adsorption isotherm is modified in order to take account of surface heterogeneity. The adsorption isotherm is obtained following the statistical mechanics formalism, proposed by Steele, and the effect of surface heterogeneity is limited to the first layer. A Gaussian adsorption energies distribution function is used to describe surface heterogeneity. The variations of the C parameter, multilayer formation and the inversion of adsorption isotherms are analysed.

scholarly journals Application of the Dubinin–Radushkevich Equation for Describing Adsorption from Solutions on to Various Carbons

1993 ◽  
Vol 10 (1-4) ◽  
pp. 105-121 ◽  
Author(s):  
A. Dabrowski ◽  
K. Nieszporek ◽  
Z. Fekner ◽  
R. Leboda ◽  
J.K. Garbacz
Keyword(s):  
Ideal Liquid ◽  
Liquid Mixtures ◽  
Solid Surfaces ◽  
Model Calculations ◽  
Adsorption From Solutions ◽  
Liquid Adsorption ◽  
Experimental Systems ◽  
Numerous Model ◽  
Adsorption Processes ◽  
Molecular Sizes

Dozens of papers have been published recently describing adsorption processes from solutions on to solid surfaces, but a certain lack of understanding of this problem is still observed. This article deals with the description of adsorption from binary solutions of non-electrolytes on to solids. This description covers adsorption both on homogeneous and heterogeneous surfaces from ideal and non-ideal liquid mixtures. Some important factors determining the adsorption process, i.e. the heterogeneity of the solid surface, interactions between the species in the bulk and surface phases, differences in molecular sizes of the adsorbate molecules, etc., have been discussed. The main attention has been focused on the Dubinin–Radushkevich equation and its application in the description of adsorption from solutions on to energetically, heterogeneous adsorbents. Numerous model calculations have been reported for this equation and several experimental systems have been analyzed. The application of the Dubinin–Radushkevich equation in characterizing liquid adsorption on to various carbons has been demonstrated.

scholarly journals BET-Type Adsorption Isotherms for Gaseous Mixtures

2005 ◽  
Vol 23 (6) ◽  
pp. 487-496 ◽  
Author(s):  
Maciej Jabłoński
Keyword(s):  
Experimental Data ◽  
Adsorption Isotherms ◽  
Active Carbon ◽  
Solid Surfaces ◽  
Gaseous Mixtures ◽  
Methanol Mixture ◽  
Adsorbed Layers ◽  
Bet Theory ◽  
Additional Assumptions

A formalism for describing the adsorption of gaseous mixtures at solid surfaces was derived as an extension of the BET theory. The following additional assumptions were made; the composition of all the adsorbed layers is the same and interaction occurs between the component molecules in the adsorbed layers. The proposed equations were compared with the experimental data obtained from measurements of the adsorption of an acetone—methanol mixture onto N-type active carbon.

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