Supramolecular composite materials from cellulose, chitosan, and cyclodextrin: facile preparation and their selective inclusion complex formation with endocrine disruptors.
Supramolecular composite materials from cellulose, chitosan, and cyclodextrin: facile preparation and their selective inclusion complex formation with endocrine disruptors.
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DOI：
10.1021/la3050016
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发表时间：
2013-04-23
期刊：
影响因子：
--
通讯作者：
Tran CD
中科院分区：
文献类型：
--
作者：
Duri S;Tran CD
以纤维素（CEL）、壳聚糖（CS）和（2，3，6-三-O-乙酰基）-α-、β-和γ-环糊精（α-、β-和γ-TCD）为原料，采用一步法制备了高性能的超分子多糖复合物。在该方法中，使用离子液体（IL）[BMIm+Cl-]作为溶剂来溶解和制备复合材料。由于所用IL的大部分（>88%）被回收用于再利用，因此该方法是可再循环的。利用XRD、FT-IR、NIR和SEM监测溶解过程，并证实多糖在没有任何化学改性的情况下再生。发现每个组分的独特性质，包括上级机械性质（来自CEL）、对污染物和毒素的优异吸附剂（来自CS）和通过包合络合物形成的尺寸/结构选择性（来自TCD）在复合材料中保持完整。具体而言，从动力学和吸附等温线的结果表明，虽然CS基复合材料可以有效地吸附内分泌干扰物（多氯酚，双酚A），其吸附是独立的分析物的大小和结构。相反，γ-TCD基复合材料的吸附表现出强烈的依赖于分析物的尺寸和结构。例如，虽然所有三种基于TCD的复合材料（即，α-、β-和γ-TCD对2-、3-和4-氯苯酚都有较好的吸附效果，只有γ-TCD对3，4-二氯苯酚和2，4，5-三氯苯酚有较好的吸附效果。此外，γ-TCD基复合材料对大体积基团的平衡吸附容量远高于CS基复合材料。总之，这些结果表明，具有相对较大的空腔尺寸的γ-TCD基复合材料可以容易地与具有大体积基团的分析物形成包合络合物，并且通过包合络合物的形成，与仅通过表面吸附来吸附分析物的CS基复合材料相比，其可以强烈地吸附更多的分析物并且具有尺寸/结构选择性。
We have successfully developed a simple and one step method to prepare high performance supramolecular polysaccharide composites from cellulose (CEL), chitosan (CS) and (2,3,6-tri-O-acetyl)-α-, β- and γ-cyclodextrin (α-, β- and γ-TCD). In this method, [BMIm+Cl−], an ionic liquid (IL), was used as a solvent to dissolve and prepare the composites. Since majority (>88%) of the IL used was recovered for reuse, the method is recyclable. XRD, FT-IR, NIR and SEM were used to monitor the dissolution process and to confirm that the polysaccharides were regenerated without any chemical modifications. It was found that unique properties of each component including superior mechanical properties (from CEL), excellent adsorbent for pollutants and toxins (from CS) and size/structure selectivity through inclusion complex formation (from TCDs) remain intact in the composites. Specifically, results from kinetics and adsorption isotherms show that while CS-based composites can effectively adsorb the endocrine disruptors (polychlrophenols, bisphenol-A), its adsorption is independent on the size and structure of the analytes. Conversely, the adsorption by γ-TCD-based composites exhibits strong dependency on size and structure of the analytes. For example, while all three TCD-based composites (i.e., α-, β- and γ-TCD) can effectively adsorb 2-, 3- and 4-chlorophenol, only γ-TCD-based composite can adsorb analytes with bulky groups including 3,4-dichloro- and 2,4,5-trichlorophenol. Furthermore, equilibrium sorption capacities for the analytes with bulky groups by γ-TCD-based composite are much higher than those by CS-based composites. Together, these results indicate that γ-TCD-based composite with its relatively larger cavity size can readily form inclusion complexes with analytes with bulky groups, and through inclusion complex formation, it can strongly adsorb much more analytes and with size/structure selectivity compared to CS-based composites which can adsorb the analyte only by surface adsorption.
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DOI：
10.1021/je1007235
发表时间：
2011-01-01
期刊：
JOURNAL OF CHEMICAL AND ENGINEERING DATA
影响因子：
--
作者：
Fendt, Sebastian;Padmanabhan, Sasisanker;Prausnitz, John M.
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影响因子：
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影响因子：
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