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

This Article Figures Only Full Text Free Full Text (PDF) Free Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in ISI Web of Science Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via ISI Web of Science (2) Citing Articles via Google Scholar Google Scholar Articles by Deng, Y. Articles by White, G. N. Search for Related Content PubMed Articles by Deng, Y. Articles by White, G. N. Agricola Articles by Deng, Y. Articles by White, G. N. Related Collections Soil Surface Chemistry Organic Compounds Soil Mineralogy

Soil Mineralogy

Adsorption of Polyacrylamide on Smectite, Illite, and Kaolinite

^a Dep. of Soil and Crop Sciences, Texas A&M Univ., College Station, TX 77843-2474
^b current address: Dep. of Crop and Soil Sciences, Washington State Univ., Pullman, WA 99164-6420

^* Corresponding author (yjdeng{at}mail.wsu.edu)

Interactions between polyacrylamides (PAMs) and clay minerals are the primary reactions in most applications of the water-soluble polymers. Our main objectives were to study (i) the effects of charge of PAM on the flocculation/dispersion of clay suspensions and on the adsorption of the polymers on clays, and (ii) the surface properties of PAM-clay complexes. Three PAMs—an anionic PAM 836A, a nonionic PAM 903N, and a cationic PAM 494C—were used to react with three common clay minerals—smectite, kaolinite, and illite. In the polymer concentration range tested (0–1.2 g L^–1), the anionic PAM 836A increased the dispersion of the clay suspensions but the cationic PAM 494C promoted the flocculation. The strong flocculation function of cationic PAM 494C made trapped clay particles inaccessible for adsorption despite its highest affinity for clay surfaces. The adsorption of the polymers was irreversible. Nonionic PAM 903N and cationic PAM 494C intercalated smectite but anionic PAM 836A did not. The adsorbed polymer moderately altered the charge properties: the cation exchange capacity (CEC) and the abilities to remove heavy metal Cu and Cr had the following order: anionic PAM 836A-clay > nonionic PAM 903N-clay clay > cationic PAM 494C-clay. The PAM-clay complexes did not show distinct adsorption for hydrophobic chlorophenols, indicating that the adsorbed polymers did not increase the hydrophobicity of the clay surfaces.

Abbreviations: CEC, cation exchange capacity • PAM, polyacrylamide

This article has been cited by other articles:

				R. A. McLaughlin and N. Bartholomew Soil Factors Influencing Suspended Sediment Flocculation by Polyacrylamide Soil Sci. Soc. Am. J., March 12, 2007; 71(2): 537 - 544. [Abstract] [Full Text] [PDF]