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Title: Cation exchange capacities of safranin, toluidine and alizarin complexes with montmorillonite

Abstract

To obtain information about the cation exchange capacity (CEC) of montmorillonite as affected by the sorption of charged organic molecules, montmorillonite samples were loaded with different amounts of positively charged molecules of safranin, toluidine blue, and negatively charged alizarin red S. Dye sorption by the clay was carried out by equilibrating samples with different concentrations of the dye. The adsorbed amounts were determined from initial and final dye concentrations using spectrophotometric methods. The CEC of the clay-organic complexes were determined by the BaCl{sub 2} base exchange capacity method. The CEC was found to decrease linearly with the increase in the amount of safranin and toluidine in the complex, giving rise to a 1:1 charge neutralization ratio. For alizarin the CEC increased linearly but was not in proportion to the amounts of alizarin in the complex. This noncumulative phenomenon was attributed to the hindering of free diffusion of exchanging cations by the adsorbed molecules.

Authors:
;
Publication Date:
Research Org.:
Univ. Nacional del Sur, Bahia Blanca (AR)
OSTI Identifier:
20006643
Resource Type:
Journal Article
Journal Name:
Soil Science
Additional Journal Information:
Journal Volume: 164; Journal Issue: 9; Other Information: PBD: Sep 1999; Journal ID: ISSN 0038-075X
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; SOIL CHEMISTRY; LAND POLLUTION; ION EXCHANGE; ORGANIC COMPOUNDS; SORPTION; DYES; MONTMORILLONITE; SORPTIVE PROPERTIES

Citation Formats

Peinemann, N., and Helmy, A.K. Cation exchange capacities of safranin, toluidine and alizarin complexes with montmorillonite. United States: N. p., 1999. Web. doi:10.1097/00010694-199909000-00004.
Peinemann, N., & Helmy, A.K. Cation exchange capacities of safranin, toluidine and alizarin complexes with montmorillonite. United States. doi:10.1097/00010694-199909000-00004.
Peinemann, N., and Helmy, A.K. Wed . "Cation exchange capacities of safranin, toluidine and alizarin complexes with montmorillonite". United States. doi:10.1097/00010694-199909000-00004.
@article{osti_20006643,
title = {Cation exchange capacities of safranin, toluidine and alizarin complexes with montmorillonite},
author = {Peinemann, N. and Helmy, A.K.},
abstractNote = {To obtain information about the cation exchange capacity (CEC) of montmorillonite as affected by the sorption of charged organic molecules, montmorillonite samples were loaded with different amounts of positively charged molecules of safranin, toluidine blue, and negatively charged alizarin red S. Dye sorption by the clay was carried out by equilibrating samples with different concentrations of the dye. The adsorbed amounts were determined from initial and final dye concentrations using spectrophotometric methods. The CEC of the clay-organic complexes were determined by the BaCl{sub 2} base exchange capacity method. The CEC was found to decrease linearly with the increase in the amount of safranin and toluidine in the complex, giving rise to a 1:1 charge neutralization ratio. For alizarin the CEC increased linearly but was not in proportion to the amounts of alizarin in the complex. This noncumulative phenomenon was attributed to the hindering of free diffusion of exchanging cations by the adsorbed molecules.},
doi = {10.1097/00010694-199909000-00004},
journal = {Soil Science},
issn = {0038-075X},
number = 9,
volume = 164,
place = {United States},
year = {1999},
month = {9}
}