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פותח על ידי קלירמאש פתרונות בע"מ -
Entrapment of humic acid in a sol-gel matrix - a new tool for sorption studies
Year:
2000
Authors :
לאור, יעל
;
.
Volume :
19
Co-Authors:
Armon, R., Fac. Civ. Eng. Environ. Water R., Technion, Haifa 32000, Israel
Zolkov, Ch., Fac. Civ. Eng. Environ. Water R., Technion, Haifa 32000, Israel
Laor, Y., Inst. Soil, Water, and Environ. Sci., Volcani Center, Agricultural Research Organization, P.O. Box 6, Bet Dagan, 50250, Israel
Facilitators :
From page:
95
To page:
100
(
Total pages:
6
)
Abstract:
Humic substances are natural complexed mixtures of organic compounds originated from the decomposition of plant and animal residues. These compounds are ubiquitous in soils, sediments, surface waters and groundwaters. They contain both hydrophobic and hydrophilic moieties, able to interact with hydrophobic organic contaminants and with heavy metals. These sorption interactions play a crucial role in contaminants fate and transport and their understanding and quantification are essential for modeling and predictions. However, sorption analyses frequently suffer from experimental problems. A novel idea presented in this study is to use sol-gel as an inert matrix to immobilize (entrap) specific, well defined, humic molecules which then be used in sorption studies. We developed a successful procedure for the immobilization of humic acid (HA) in a sol-gel matrix. After gelation and drying, the doped gel was crushed and washed several times, yielding a very stable product. It was then used in a series of batch experiments, studying the sorption of several polycyclic aromatic hydrocarbons (PAHs) with Aldrich HA. The sorption coefficients (Koc) obtained with the immobilized HA were highly correlated with the values expected based on the hydrophobicity of the contaminants. We concluded that the entrapped HA retained its original properties and that it was accessible to the external contaminants through the pore network.
Note:
Related Files :
drying
Gelation
Humic acid immobilization
Hydrophobicity
Impurities
Mixtures
Organic acids
Sol-gel matrix
Sorption
עוד תגיות
תוכן קשור
More details
DOI :
10.1023/A:1008770407630
Article number:
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
28320
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:38
Scientific Publication
Entrapment of humic acid in a sol-gel matrix - a new tool for sorption studies
19
Armon, R., Fac. Civ. Eng. Environ. Water R., Technion, Haifa 32000, Israel
Zolkov, Ch., Fac. Civ. Eng. Environ. Water R., Technion, Haifa 32000, Israel
Laor, Y., Inst. Soil, Water, and Environ. Sci., Volcani Center, Agricultural Research Organization, P.O. Box 6, Bet Dagan, 50250, Israel
Entrapment of humic acid in a sol-gel matrix - a new tool for sorption studies
Humic substances are natural complexed mixtures of organic compounds originated from the decomposition of plant and animal residues. These compounds are ubiquitous in soils, sediments, surface waters and groundwaters. They contain both hydrophobic and hydrophilic moieties, able to interact with hydrophobic organic contaminants and with heavy metals. These sorption interactions play a crucial role in contaminants fate and transport and their understanding and quantification are essential for modeling and predictions. However, sorption analyses frequently suffer from experimental problems. A novel idea presented in this study is to use sol-gel as an inert matrix to immobilize (entrap) specific, well defined, humic molecules which then be used in sorption studies. We developed a successful procedure for the immobilization of humic acid (HA) in a sol-gel matrix. After gelation and drying, the doped gel was crushed and washed several times, yielding a very stable product. It was then used in a series of batch experiments, studying the sorption of several polycyclic aromatic hydrocarbons (PAHs) with Aldrich HA. The sorption coefficients (Koc) obtained with the immobilized HA were highly correlated with the values expected based on the hydrophobicity of the contaminants. We concluded that the entrapped HA retained its original properties and that it was accessible to the external contaminants through the pore network.
Scientific Publication
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