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פותח על ידי קלירמאש פתרונות בע"מ -
Anionic polyacrylamide polymer adsorption by pyrophyllite and montmorillonite
Year:
2003
Source of publication :
Clays and Clay Minerals
Authors :
הלר, חנה
;
.
קרן, רמי
;
.
Volume :
51
Co-Authors:
Heller, H., Inst. of Soil Water/Environ. Sci., The Volcani Center, Agricultural Research Organization, PO Box 6, Bet Dagan 50250, Israel
Keren, R., Inst. of Soil Water/Environ. Sci., The Volcani Center, Agricultural Research Organization, PO Box 6, Bet Dagan 50250, Israel
Facilitators :
From page:
334
To page:
339
(
Total pages:
6
)
Abstract:
The mechanism by which the anionic polymers interact with platelets of 2:1 clay minerals is not fully understood. The objective of the present study was to evaluate the effect of the electric field associated with the basal and edge surfaces of the clay minerals on the adsorption of anionic polymers. Two negatively charged polymers, PAM90 and ACC86, of the same molecular weight (2 × 105 g mol 1) but with different degrees of hydrolysis (90 and 20%, respectively), were used. The effect of pH (6, 10), NaCl concentration (0, 10 mmolc L-1) and clay particle size on PAM90 adsorption by pyrophyllite and the effect of NaCl concentration on the adsorption of these polymers by Na-montmorillonite in aqueous suspensions were studied. Adsorption of PAM90 on pyrophyllite was greater at pH 6 than at pH 10 and greater in 10 mmol L 1 NaCl than in distilled water. Adsorption of PAM90 on pyrophyllite increased with decreasing particle size. On pyrophyllite the high-charge-density PAM90 was adsorbed to a greater extent than the low-charge-density ACC86; by contrast, ACC86 adsorption was greater than that of PAM90 on Na-montmorillonite. These results were attributed to the repulsive forces which develop between the negatively charged extended-chain polymer and the extended negative electric field associated with the basal surfaces, around the Na-montmorillonite platelets. The results may suggest that the edge surfaces play a major role in PAM adsorption.
Note:
Related Files :
Adsorption
clay mineral
Clay minerals
Concentration (process)
Particle size analysis
Platelets
Pyrophyllite
Surfaces
עוד תגיות
תוכן קשור
More details
DOI :
10.1346/CCMN.2003.0510310
Article number:
0
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
27264
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:29
Scientific Publication
Anionic polyacrylamide polymer adsorption by pyrophyllite and montmorillonite
51
Heller, H., Inst. of Soil Water/Environ. Sci., The Volcani Center, Agricultural Research Organization, PO Box 6, Bet Dagan 50250, Israel
Keren, R., Inst. of Soil Water/Environ. Sci., The Volcani Center, Agricultural Research Organization, PO Box 6, Bet Dagan 50250, Israel
Anionic polyacrylamide polymer adsorption by pyrophyllite and montmorillonite
The mechanism by which the anionic polymers interact with platelets of 2:1 clay minerals is not fully understood. The objective of the present study was to evaluate the effect of the electric field associated with the basal and edge surfaces of the clay minerals on the adsorption of anionic polymers. Two negatively charged polymers, PAM90 and ACC86, of the same molecular weight (2 × 105 g mol 1) but with different degrees of hydrolysis (90 and 20%, respectively), were used. The effect of pH (6, 10), NaCl concentration (0, 10 mmolc L-1) and clay particle size on PAM90 adsorption by pyrophyllite and the effect of NaCl concentration on the adsorption of these polymers by Na-montmorillonite in aqueous suspensions were studied. Adsorption of PAM90 on pyrophyllite was greater at pH 6 than at pH 10 and greater in 10 mmol L 1 NaCl than in distilled water. Adsorption of PAM90 on pyrophyllite increased with decreasing particle size. On pyrophyllite the high-charge-density PAM90 was adsorbed to a greater extent than the low-charge-density ACC86; by contrast, ACC86 adsorption was greater than that of PAM90 on Na-montmorillonite. These results were attributed to the repulsive forces which develop between the negatively charged extended-chain polymer and the extended negative electric field associated with the basal surfaces, around the Na-montmorillonite platelets. The results may suggest that the edge surfaces play a major role in PAM adsorption.
Scientific Publication
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