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Spectroscopic investigation of the adsorption mechanisms of polyacrylamide polymers onto iron oxide particles

McGuire, Melanie J, Addai-Mensah, Jonas and Bremmell, Kristen E (2006) Spectroscopic investigation of the adsorption mechanisms of polyacrylamide polymers onto iron oxide particles. Journal of Colloid and Interface Science, 299 (2). pp. 547-555. ISSN 0021-9797

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Abstract

The mechanisms of high-molecular-weight polyacrylamide nonionic homopolymer and 25 mol% anionic acrylate-substituted copolymer adsorption onto iron oxide particles were investigated via DRIFT and UV–vis spectroscopies at three pH values (6, 8.5, and 11). While electrostatic interactions play an important role in charged polymer adsorption, this information is not spectroscopically available. At pH values above and below pH 8.5 (the isoelectric point for the anionic polymer), bidentate chelation and hydrogen bonding were the main adsorption mechanisms. At the isoelectric point, monodentate chelation was observed to be the main mode of adsorption, along with hydrogen bonding. For the nonionic polymer, in all cases, hydrogen bonding through the carbonyl group was the main mode of adsorption. The adsorption of both polymers conformed well to the Freundlich model, suggesting that the adsorbed polymer amount increases with increasing polymer concentration up to 7500 g/t solid, rather than approaching monolayer coverage. Spectroscopic evidence was found to suggest that hydrolysis of nonionic polyacrylamide occurs at high pH.

Item Type: Article
Additional Information:

Online ISSN: 1095-7103

Uncontrolled Keywords: ResPubID22123. polymer adsorption, polymers, iron oxide, polyacrylamide, hematite, adsorption mechanism, hydrolysis, infrared spectroscopy
Subjects: FOR Classification > 0904 Chemical Engineering
Depositing User: VUIR
Date Deposited: 31 Jan 2012 01:40
Last Modified: 31 Jan 2012 01:40
URI: http://vuir.vu.edu.au/id/eprint/8077
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Citations in Scopus: 33 - View on Scopus

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