Polymer-Clay Nanocomposites for the Uptake of Hazardous Anions

Huaibin Zhang, Wenyan Huang, Sridhar Komarneni

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Polymer intercalated clay nanocomposites were prepared from various montmorillonites (Mt) and a polymer, polydiallyldimethylammonim (PDDA) chloride. X-ray diffraction (XRD) analysis of the above polymer intercalated nanocomposites showed either no crystalline peaks or very broad peaks with the intercalation of PDDA polymer in the interlayers, probably as a result of exfoliation of the clay layers. Infrared spectroscopy revealed the presence of PDDA in all the clay nanocomposite materials. The maximum adsorption capacities of nitrate, perchlorate, and chromate by one of the polymer intercalated nanocomposite materials prepared from montmorillonite, Kunipea were 0.40 (Formula presented.), 0.44 (Formula presented.) and 0.299 (Formula presented.), respectively. The other two polymer intercalated nanocomposites prepared with montmorillonites from Wyoming and China showed very good adsorption capacities for perchlorate but somewhat lower uptake capacities for chromate and nitrate compared to the nanocomposite prepared from montmorillonite from Kunipea. The uptake of nitrate, perchlorate and chromate by the polymer intercalated nanocomposites could be well described using the Freundlich isotherm while their uptake kinetics fitted well to the pseudo-second-order model. The uptake kinetics of nitrate, perchlorate, and chromate were found to be fast as equilibrium was reached within 4  (Formula presented.). Moreover, the uptakes of chromate by polymer intercalated nanocomposites were found to be highly selective in the presence of (Formula presented.), (Formula presented.) and (Formula presented.), the most abundant naturally occurring anions.

Original languageEnglish (US)
Article number467
Issue number5
StatePublished - Mar 2024

All Science Journal Classification (ASJC) codes

  • General Chemical Engineering
  • General Materials Science

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