Journal
COLLOID AND POLYMER SCIENCE
Volume 290, Issue 11, Pages 1053-1064Publisher
SPRINGER
DOI: 10.1007/s00396-012-2620-3
Keywords
Water remediation and contamination; Poly (N-isopropylacrylamide)-co-acrylic acid microgel aggregates; Thermoresponsive polymeric materials; Azo dyes; pNIPAm
Categories
Funding
- University of Alberta (the Department of Chemistry and the Faculty of Science)
- Natural Science and Engineering Research Council (NSERC)
- Canada Foundation for Innovation (CFI)
- Alberta Advanced Education & Technology Small Equipment Grants Program (AET/SEGP)
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Poly (N-isopropylacrylamide)-co-acrylic acid (pNIPAm-co-AAc) microgel based assemblies (aggregates) were synthesized from microgels of various diameters via polymerization of the crosslinker N,N'-methylenebisacrylamide (BIS) in the presence of microgels in solution. We investigated the ability of the respective aggregates to remove the organic, azo dye molecule 4-(2-hydroxy-1-napthylazo) benzenesulfonic acid sodium salt (Orange II) from water at both room and elevated temperatures. The results from the microgel aggregates made from 1.1-mu m-diameter [Parasuraman and Serpe. ACS Applied Materials & Interfaces, 2011] microgels were compared to aggregates synthesized from 321-nm and 1.43-mu m-diameter microgels. Aggregates made from the same size microgels showed increased uptake efficiency as the concentration of BIS in the aggregates was increased, while for a given BIS concentration, the uptake efficiency increased with increasing microgel size in the aggregate. We attribute this to the nature of the aggregates; aggregates have void space between the microgels that can serve as reservoirs for Orange II uptake-the void spaces are hypothesized to increase with larger diameter microgels. By exploiting the thermoresponsive nature of the microgels, and microgel based aggregates, 85.3 % removal efficiencies can be achieved. Finally, all uptake trends for the aggregates, at room temperature, were fit with a Langmuir sorption isotherm model.
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