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首页> 外文期刊>Journal of Applied Polymer Science >Preparation and sorption studies of microsphere copolymers containing β-cyclodextrin and poly(acrylic acid)
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Preparation and sorption studies of microsphere copolymers containing β-cyclodextrin and poly(acrylic acid)

机译：含β-环糊精和聚丙烯酸的微球共聚物的制备和吸附研究

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摘要

Microsphere polymeric materials containing β-cyclodextrin (β-CD) and poly(acrylic acid) (PAA) with tunable morphologies were prepared in order to improve their sorption characteristics in aqueous solution. The microsphere polymeric materials were prepared using a (water/oil) micro-emulsion-evaporation technique to condense β-cyclodextrin (β-CD) with PAA at various comonomer ratios and mixing speeds. The β-CD microsphere copolymers were characterized using FTIR, TGA, DSC, SEM, elemental (C and H) microanalyses, and solid state ~(13)C-NMR spectroscopy. The sorption properties of the polymeric materials at 295 K in aqueous solution containing p-nitrophenol (PNP) were studied using a dye-based method with UV-Vis spectrophotometry at pH 4.6 and 10.3. The sorption isotherms of copolymer/PNP systems were evaluated with various isotherm models (e.g., Langmuir, BET, Freundlich, and Sips). The Sips isotherm showed the best overall agreement with the experimental results and the sorption parameters provided estimates of the sorbent surface area (12.0-331 m ~2/g) and the sorption capacity (Q _m = 0.359-2.20 mmol/g at pH = 4.6; Q _m = 0.070-0.191 mmol/g at pH = 10.3) for the microsphere copolymer/PNP systems in aqueous solution. The nitrogen adsorption properties of the microporous copolymers in the solid state were obtained at 77K with BET surface areas ranging from 0.275 to 4.47 m ~2/g.
机译：为了改善其在水溶液中的吸附特性，制备了含有β-环糊精（β-CD）和聚丙烯酸（PAA）且具有可调形态的微球聚合物材料。使用（水/油）微乳化蒸发技术制备微球聚合物材料，以各种共聚单体比例和混合速度将β-环糊精（β-CD）与PAA缩合。使用FTIR，TGA，DSC，SEM，元素（C和H）微观分析以及固态〜（13）C-NMR光谱对β-CD微球共聚物进行表征。使用基于染料的方法，在pH 4.6和10.3的条件下，采用紫外可见分光光度法研究了聚合物材料在含对硝基苯酚（PNP）的水溶液中在295 K时的吸附性能。用各种等温模型（例如Langmuir，BET，Freundlich和Sips）评估共聚物/ PNP系统的吸附等温线。 Sips等温线与实验结果显示出最佳的整体一致性，其吸附参数提供了对吸附剂表面积（12.0-331 m〜2 / g）和吸附容量（Q _m = 0.359-2.20 mmol / g，在pH = 4.6;对于水溶液中的微球共聚物/ PNP体系，Q_m ＝ 0.070-0.191mmol / g，pH ＝ 10.3）。固态微孔共聚物的氮吸附性能是在77K下获得的，BET表面积为0.275至4.47 m〜2 / g。

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