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Sulfur containing poly( N ‐isopropylacrylamide) copolymer hydrogels for thermosensitive extraction of gold(III) ions
Author(s) -
Hemvasdukij Suwimol,
Ngeontae Wittaya,
Imyim Apichat
Publication year - 2011
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.33487
Subject(s) - copolymer , sorption , extraction (chemistry) , aqueous solution , polymer chemistry , poly(n isopropylacrylamide) , desorption , materials science , adsorption , polymerization , freundlich equation , thiourea , radical polymerization , nuclear chemistry , chemistry , chromatography , polymer , organic chemistry
Abstract Poly[ N ‐isopropylacrylamide‐ co ‐[2‐(methylthio)ethyl methacrylate]], poly(NIPA‐ co ‐MTEMA) gels were prepared by free radical polymerization in aqueous solution. The homogeneous and heterogeneous gels were prepared by using 10 m M MTEMA in 5.0%(v/v) ethanol at 10°C and 30 m M MTEMA in 20%(v/v) ethanol at 50°C, in 1.0 and 1.5 M NIPA solution, respectively. Homogeneous and heterogeneous gels had swelling ratios at 540 ± 28% and 551 ± 37%, respectively. The extraction of Au(III) ion was studied in batch method. The optimum pHs for the extraction of Au(III) by homogeneous and heterogeneous gels were 1–3 and 1–5, respectively. The suitable extraction time was 3 h at 50°C when using a rod‐shaped copolymer (0.7 cm diameter and 1 cm length). The adsorption behavior obeyed the Langmuir and Freundlich isotherms. The maximum sorption capacities of Au(III) onto homogeneous and heterogeneous gels were 62.8 and 322 μmol/g, respectively. The desorption equilibrium was reached within 2–3 h at 10°C by 0.1 M thiourea in 5%(v/v) HCl. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011