کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5211533 | 1382954 | 2008 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Selective adsorption of tea polyphenols from aqueous solution of the mixture with caffeine on macroporous crosslinked poly(N-vinyl-2-pyrrolidinone)
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
A macroporous polymeric adsorbent with moderate hydrophobic matrix and hydrogen-bonding moieties was prepared by free radical suspension copolymerization of N-vinyl-2-pyrrolidinone, ethylene glycol dimethacrylate and triallyl isocyanurate. SEM image and N2 adsorption-desorption isotherm measurements of the resulting resin, defined as PVP-DEGMA-TAIC, show that the average pore diameter and specific surface area are â¼400Â nm and 114Â m2/g, respectively. The adsorption behavior of tea polyphenols and caffeine on PVP-DEGMA-TAIC resin indicates that the adsorption of tea polyphenols is driven by combined action of hydrophobic interaction and hydrogen bonding, while the adsorption of caffeine is driven by only hydrophobic interaction. The adsorption from an aqueous solution of a mixture of tea polyphenols and caffeine (initial weight concentration ratio was â¼5/1) on PVP-DEGMA-TAIC shows that the adsorption capacities for tea polyphenols and caffeine were 98Â mg/g and 1-2Â mg/g with removal percentages of 93% and 8%, respectively. The product eluted with ethanol contains â¼98% tea polyphenols and â¼2% caffeine. These results indicate that selective adsorption of polyphenols from the mixture with caffeine on PVP-DEGMA-TAIC resin was excellent.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Reactive and Functional Polymers - Volume 68, Issue 3, March 2008, Pages 768-774
Journal: Reactive and Functional Polymers - Volume 68, Issue 3, March 2008, Pages 768-774
نویسندگان
Ruiying Zhao, Yu Yan, Mingxian Li, Husheng Yan,