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פותח על ידי קלירמאש פתרונות בע"מ -
A model for cation adsorption to clays and membranes
Year:
1994
Source of publication :
Colloid & Polymer Science
Authors :
ירמיהו, אורי
;
.
Volume :
272
Co-Authors:
Nir, S., The Seagram Center for Soil and Water Sciences, Faculty of Agriculture, The Hebrew University of Jerusalem, Rehovot, 76100, Israel
Rytwo, G., The Seagram Center for Soil and Water Sciences, Faculty of Agriculture, The Hebrew University of Jerusalem, Rehovot, 76100, Israel
Yermiyahu, U., The Seagram Center for Soil and Water Sciences, Faculty of Agriculture, The Hebrew University of Jerusalem, Rehovot, 76100, Israel
Margulies, L., The Seagram Center for Soil and Water Sciences, Faculty of Agriculture, The Hebrew University of Jerusalem, Rehovot, 76100, Israel
Facilitators :
From page:
619
To page:
632
(
Total pages:
14
)
Abstract:
A cation adsorption model is presented and its recent applications are discussed. The model combines electrostatic equations with specific binding, and considers neutral and positively charged complexes between the negative surface sites and organic cations in a closed system. Extensions in the model account for dye aggregation in solution, and for the formation of solution complexes of inorganic cations, such as [M++ Cl-]+. The amounts of 45Ca2+ adsorbed to vesicles extracted from the plasma membranes of melon root cells could be adequately simulated and predicted. The binding coefficients determined for Ca2+, Na+, and Mg2+ are in the range of values previously deduced for binding to phospholipid components. Model calculations were applied to the test of hypotheses on the effect of salt stress on the growth of roots. The adsorption of monovalent organic cations to montmorillonite is characterized by binding coefficients that are at least six orders of magnitude larger than those of Na+, Mg2+, Ca2+, and Cd2+, or those of CdCl+ or CaCl+. Monovalent organic cations were found to adsorb 140-200% of the cation exchange capacity of the clay and to cause charge reversal. Deductions from adsorption results of acriflavin are consistent with those drawn from the application of other experimental methods. Preliminary results on the adsorption of divalent organic cations are presented. Agro-environmental applications of organo-clays are discussed. © 1994 Steinkopff-Verlag.
Note:
Related Files :
Adsorption
Agglomeration
Dye aggregation
Electrostatic equation
Inorganic cation
Salt micelles
עוד תגיות
תוכן קשור
More details
DOI :
10.1007/BF00659277
Article number:
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
28007
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:35
You may also be interested in
Scientific Publication
A model for cation adsorption to clays and membranes
272
Nir, S., The Seagram Center for Soil and Water Sciences, Faculty of Agriculture, The Hebrew University of Jerusalem, Rehovot, 76100, Israel
Rytwo, G., The Seagram Center for Soil and Water Sciences, Faculty of Agriculture, The Hebrew University of Jerusalem, Rehovot, 76100, Israel
Yermiyahu, U., The Seagram Center for Soil and Water Sciences, Faculty of Agriculture, The Hebrew University of Jerusalem, Rehovot, 76100, Israel
Margulies, L., The Seagram Center for Soil and Water Sciences, Faculty of Agriculture, The Hebrew University of Jerusalem, Rehovot, 76100, Israel
A model for cation adsorption to clays and membranes
A cation adsorption model is presented and its recent applications are discussed. The model combines electrostatic equations with specific binding, and considers neutral and positively charged complexes between the negative surface sites and organic cations in a closed system. Extensions in the model account for dye aggregation in solution, and for the formation of solution complexes of inorganic cations, such as [M++ Cl-]+. The amounts of 45Ca2+ adsorbed to vesicles extracted from the plasma membranes of melon root cells could be adequately simulated and predicted. The binding coefficients determined for Ca2+, Na+, and Mg2+ are in the range of values previously deduced for binding to phospholipid components. Model calculations were applied to the test of hypotheses on the effect of salt stress on the growth of roots. The adsorption of monovalent organic cations to montmorillonite is characterized by binding coefficients that are at least six orders of magnitude larger than those of Na+, Mg2+, Ca2+, and Cd2+, or those of CdCl+ or CaCl+. Monovalent organic cations were found to adsorb 140-200% of the cation exchange capacity of the clay and to cause charge reversal. Deductions from adsorption results of acriflavin are consistent with those drawn from the application of other experimental methods. Preliminary results on the adsorption of divalent organic cations are presented. Agro-environmental applications of organo-clays are discussed. © 1994 Steinkopff-Verlag.
Scientific Publication
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