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Adsorption of Hydrolyzed Polyacrylonitrile on Kaolinite

Published online by Cambridge University Press:  01 January 2024

J. L. Mortensen
J. L. Mortensen*
Affiliation:
Ohio State University and Ohio Agricultural Experiment Station, Ohio, USA
*
2Present address: Department of Agronomy, Ohio State University, Columbus, Ohio
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Abstract

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Adsorption experiments were conducted by mixing homoionic kaolinite and C14-labeled hydrolyzed polyacrylonitrile (HPAN) in water and solutions of electrolytes. Langmuir type adsorption isotherms resulted. Exchange cations on kaolinite increased adsorption in approximately the same order as such cations reduce zeta potential, i.e. Th4+ > Ca2+ > Ba2+ > H+ > NH4+ > K+ > Na+. The anomalous increase in adsorption in the presence of polyvalent exchange cations suggested adsorption at the site of base exchange salt formation. Sorbed anions increased adsorption of HPAN in the order of electronegativity, i.e. F- > OH- > H2PO4- > Cl- > CH3COO- > NO3-.

An increase in the concentration of electrolyte and acidity of the adsorbate medium increased adsorption of HPAN. This effect was apparently due to the reduction of electrostatic repulsion between HPAN and kaolinite and a reduction in size of the polymer coil. Divalent cations, especially the transition metals capable of being complexed by HPAN, were more effective than univalent cations. Dissolution of the clay lattice caused desorption of HPAN.

HPAN adsorption reduced the intensity of the OH and O—Al—OH bands in infrared absorption spectra of the kaolinite. Preadsorption of aurintricarboxylic acid blocked adsorption of HPAN, suggesting that “positive spots” due to exposed lattice aluminum on edges of the clay platelets were adsorption sites.

Type
Symposium on Clay—Organic Complexes
Information
Clays and Clay Minerals (National Conference on Clays and Clay Minerals) , Volume 9 , February 1960 , pp. 530 - 545
Copyright
Copyright © The Clay Minerals Society 1960

Footnotes

Journal Paper no. 86-60 of the Ohio Agricultural Experiment Station, published with permission of the Director as a collaborator under North Central Regional Cooperative Project NC-17.

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