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פותח על ידי קלירמאש פתרונות בע"מ -
Simplified link solvation model (LSM) for sorption in natural organic matter
Year:
2002
Source of publication :
Langmuir
Authors :
בוריסובר, מיכאל
;
.
גרבר, אלן
;
.
Volume :
18
Co-Authors:
Borisover, M., Institute of Soil, Water and Environmental Sciences, Volcani Center, A.R.O, P.O.B. 6, Bet Dagan 50250, Israel
Graber, E.R., Institute of Soil, Water and Environmental Sciences, Volcani Center, A.R.O, P.O.B. 6, Bet Dagan 50250, Israel
Facilitators :
From page:
4775
To page:
4782
(
Total pages:
8
)
Abstract:
The aim of this paper is to formalize a conceptual model for explaining solvent-assisted sorption of organic compounds by a natural organic matter (NOM) sorbent. A local sorption isotherm is developed to describe the penetration of solute and/or solvent molecules into noncovalent inter- and intramolecular contacts in the NOM structure, and sorbate interactions with fragments of the disrupted contact. A general sorption isotherm accounting for em exponential sorption site energy distribution is derived from the local isotherm and is then extended to account for sorption cooperativity. This new model successfully describes cooperative sorption behavior of pyridine from different solvents on NOM and reproduces an experimentally observed maximum in pyridine uptake from mixtures of an inert hydrocarbon and a polar solvent at an intermediate polar solvent activity. The model engenders a number of observations and predictions that have been borne out experimentally: (1) the exponent of the Freundlich model applied to the sorption isotherm of a compound is not affected by the particular solvent; (2) the solvent-assisted effect is not a function of solute activity; (3) the solvent effect will be similar for organic compounds that successfully compete with a solvent for the same kind of link fragment; (4) where a solute cannot successfully compete with a solvent for a given link fragment, no solvent-assisted sorption is expected. The strength of this model is its flexibility and its potential to account for both asymmetry of disruptable NOM links and diverse forces of sorbate-solvent interactions at fragments of disrupted contacts.
Note:
Related Files :
Hydrocarbons
Isotherms
Macromolecules
Mathematical models
Natural organic matter (NOM)
Solvents
Sorption
water
עוד תגיות
תוכן קשור
More details
DOI :
10.1021/la0117911
Article number:
0
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
19152
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:26
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Scientific Publication
Simplified link solvation model (LSM) for sorption in natural organic matter
18
Borisover, M., Institute of Soil, Water and Environmental Sciences, Volcani Center, A.R.O, P.O.B. 6, Bet Dagan 50250, Israel
Graber, E.R., Institute of Soil, Water and Environmental Sciences, Volcani Center, A.R.O, P.O.B. 6, Bet Dagan 50250, Israel
Simplified link solvation model (LSM) for sorption in natural organic matter
The aim of this paper is to formalize a conceptual model for explaining solvent-assisted sorption of organic compounds by a natural organic matter (NOM) sorbent. A local sorption isotherm is developed to describe the penetration of solute and/or solvent molecules into noncovalent inter- and intramolecular contacts in the NOM structure, and sorbate interactions with fragments of the disrupted contact. A general sorption isotherm accounting for em exponential sorption site energy distribution is derived from the local isotherm and is then extended to account for sorption cooperativity. This new model successfully describes cooperative sorption behavior of pyridine from different solvents on NOM and reproduces an experimentally observed maximum in pyridine uptake from mixtures of an inert hydrocarbon and a polar solvent at an intermediate polar solvent activity. The model engenders a number of observations and predictions that have been borne out experimentally: (1) the exponent of the Freundlich model applied to the sorption isotherm of a compound is not affected by the particular solvent; (2) the solvent-assisted effect is not a function of solute activity; (3) the solvent effect will be similar for organic compounds that successfully compete with a solvent for the same kind of link fragment; (4) where a solute cannot successfully compete with a solvent for a given link fragment, no solvent-assisted sorption is expected. The strength of this model is its flexibility and its potential to account for both asymmetry of disruptable NOM links and diverse forces of sorbate-solvent interactions at fragments of disrupted contacts.
Scientific Publication
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