| Comparison of structural, textural and thermal characteristics of pure and acid treated bentonites from Aleksinac and Petrovac (Serbia). | |
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MedLine Citation:
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PMID: 21824809 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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Bentonite samples collected from vicinity of Petrovac and Aleksinac were treated with different sulfuric acid molarities. Acid attack dissolved the octahedral sheets by interlayer and edge attack. The effects of the H(2)SO(4) acid caused an exchange of Al(3+), Fe(3+) and Mg(2+) with H(+) ions leading to a modification of the smectite crystalline structure. The Mg and Fe substitution in the octahedral sheets promoted the dispersion of corresponding layers and formation of amorphous silicon. The activated bentonites, after the treatment of sulfuric acid, exhibited a lower cation-exchange capacity (CEC) and significant increase of specific surface area from 6 to 387m(2)g(-1) (bentonite from Petrovac) and from 11 to 306 m(2)g(-1) (bentonite from Aleksinac). The acid reaction caused a splitting of particles within the octahedral sheet which led to an increase in specific surface area and decrease in CEC in both bentonites. |
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Authors:
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Zorica P Tomić; Vesna P Logar; Biljana M Babic; Jelena R Rogan; Petre Makreski |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-7-26 |
Journal Detail:
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Title: Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy Volume: - ISSN: 1873-3557 ISO Abbreviation: - Publication Date: 2011 Jul |
Date Detail:
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Created Date: 2011-8-9 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9602533 Medline TA: Spectrochim Acta A Mol Biomol Spectrosc Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Copyright Information:
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Copyright © 2011 Elsevier B.V. All rights reserved. |
Affiliation:
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Faculty of Agriculture, Institute of Soil and Melioration, Belgrade University, 11080 Belgrade, Serbia. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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