HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Mortensen, J. L. Search for Related Content PubMed Articles by Mortensen, J. L. Agricola Articles by Mortensen, J. L.

Adsorption of Hydrolyzed Polyacrylonitrile on Kaolinite: I. Effect of Exchange Cation and Anion¹

ABSTRACT

The rate and extent of adsorption of hydrolzed polyacrylonitrile (HPAN) on kaolinite was determined, using HPAN labelled with C¹⁴. Continuous mixing in the presence of univalent exchange ions gave steady state adsorption within 4 hours. Langmuir type adsorption isotherms resulted. Saturation adsorption was 2.6 me. HPAN per 100 g. H-Cl-kaolinite.

The exchange cation affected the extent of adsorption of HPAN in approximately the same order as such cations reduce the zeta potential of kaolinite, i.e., Th⁴⁺ > Ca²⁺ > Ba²⁺ > H⁺ > NH₄⁺ > K⁺ > Na⁺. An anomalous increase in adsorption in the presence of polyvalent exchange cations suggested adsorption at the site of base exchange salt formation. Anions of sodium salts sorbed on kaolinite increased adsorption of HPAN in the order F^- > OH^- > H₂PO₄^- > Cl^- > CH₃COO^- > NO₃^- > HPAN.

HPAN was apparently adsorbed as a monolayer on a single set of sites which are most likely "positive spots" on the edge of the kaolinite crystal or which arise from adsorbed or colloidal sesquioxide impurities.

¹ Journal paper No. 78-56 of the Ohio Agr. Exp. Sta., published with permission of the director as a collaborator under North Central Region cooperative project entitled, "Value of organic matter and soil and crop management practices in improving soil structure and productivity." Presented before Div. II, Soil Science Society of America, Cincinnati, Ohio. Nov. 14, 1956.

² Assistant Professor, Ohio Agr. Exp. Sta. and Ohio State University.

Received for publication January 8, 1957. Accepted for publication February 6, 1957.