Synergistic adsorption of heavy metal ions and organic pollutants by supramolecular polysaccharide composite materials from cellulose, chitosan and crown ether.
Synergistic adsorption of heavy metal ions and organic pollutants by supramolecular polysaccharide composite materials from cellulose, chitosan and crown ether.
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DOI：
10.1016/j.jhazmat.2013.11.007
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发表时间：
2014-01-15
影响因子：
13.6
通讯作者：
Tran CD
中科院分区：
文献类型：
--
作者：
Mututuvari TM;Tran CD
以纤维素（CEL）、壳聚糖（CS）和苯并-15-冠-5（B15 C5）为原料，采用一步法合成了新型超分子多糖复合物。丁基甲基咪唑氯化物[BMIm+Cl−]，一种离子液体（IL），被用作溶解和制备复合材料的唯一溶剂。由于所使用的大部分[BMIm+Cl−]被回收再利用，因此该方法是可回收的。所获得的[CEL/CS + B15 C5]复合材料保留了其组分的性质，即上级机械强度（来自CEL）、对重金属离子和有机污染物的优异吸附能力（来自B15 C5和CS）。更重要的是，[CEL/CS + B15 C5]复合材料表现出真正的超分子性质。CS、CEL和B15 C5单独吸附Cd ~（2+）、Zn ~（2+）和2，4，5-三氯苯酚均具有较好的效果。然而，通过将B15 C5添加到CEL和/或CS中，复合材料的吸附能力显著且协同地增强。也就是说，[CS + B15 C5]、[CEL + B15 C5]和[CEL + CS + B15 C5]复合材料对Cd 2+和Zn 2+的吸附容量（qe值）远高于单独的CS、CEL和B15 C5复合材料的组合qe值。B15 C5与CS（或CEL）协同作用，与Cd 2+（或Zn 2+）形成更稳定的复合物，从而使[CS + B15 C5]（或[CEL + B15 C5]）复合物对Cd 2+（或Zn 2+）的吸附量相对较大。此外，吸附在复合材料上的污染物可以定量解吸，使[CS + CEL + B15 C5]复合材料可以重复使用，具有相似的吸附效率。
We have developed a simple one-step method to synthesize novel supramolecular polysaccharide composites from cellulose (CEL), chitosan (CS) and benzo-15-crown 5 (B15C5). Butylmethylimidazolium chloride [BMIm+Cl−], an ionic liquid (IL), was used as a sole solvent for dissolution and preparation of the composites. Since majority of [BMIm+Cl−] used was recovered for reuse, the method is recyclable. The [CEL/CS + B15C5] composites obtained retain properties of their components, namely superior mechanical strength (from CEL), excellent adsorption capability for heavy metal ions and organic pollutants (from B15C5 and CS). More importantly, the [CEL/CS + B15C5] composites exhibit truly supramolecular properties. By itself CS, CEL and B15C5 can effectively adsorb Cd2+, Zn2+ and 2,4,5-trichlorophenol. However, adsorption capability of the composite was substantially and synergistically enhanced by adding B15C5 to either CEL and/or CS. That is, the adsorption capacity (qe values) for Cd2+ and Zn2+ by [CS + B15C5], [CEL + B15C5] and [CEL + CS + B15C5] composites are much higher than combined qe values of individual CS, CEL and B15C5 composites. It seems that B15C5 synergistically interact with CS (or CEL) to form more stable complexes with Cd2+ (or Zn2+), and as a consequence, the [CS + B15C5] (or the [CEL + B15C5]) composite can adsorb relatively larger amount Cd2+ (or Zn2+). Moreover, the pollutants adsorbed on the composites can be quantitatively desorbed to enable the [CS + CEL + B15C5] composites to be reused with similar adsorption efficiency.