Multifunctional Polymer Sponge with Molecule Recognition: Facile Mechanic Induced Separation
Multifunctional Polymer Sponge with Molecule Recognition: Facile Mechanic Induced Separation
复制标题
具有分子识别功能的多功能聚合物海绵：轻松的机械诱导分离
DOI：
10.1021/acs.langmuir.9b02857
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发表时间：
2019
期刊：
影响因子：
3.9
通讯作者：
Jiang Xuesong
中科院分区：
文献类型：
--
作者：
Li Jin;Wang Ruiqing;Su Zhilong;Ma Xiaodong;Jiang Xuesong
分子识别聚合物海绵为水净化和工业分离提供了一种简便易行、操作简单的方法，但由于选择性吸附、高机械强度和易于收集/重复使用等关键问题很难在一种材料中实现，因此其制备仍然具有挑战性。受天然海绵的启发，开发了一种新型的多功能聚合物海绵，它是以多功能胺聚乙烯亚胺和双环氧交联剂聚乙二醇二缩水甘油醚为模板，在机械压榨和过滤过程中高效收集染料和同时回收纯水的新型聚合物海绵。将制得的海绵(SP-1)通过简单的浸渍-交联工艺进一步用聚咖啡酸进行改性，得到具有比SP-1更高抗压强度的杂化聚合物海绵(SP-2)。这些海绵具有交联的三维大孔结构，在毛细管引导下，在20 S范围内具有超过自身重量10倍以上的快速吸水性能。采用机械诱导分离的方法，详细研究了该聚合物海绵对11种亲水性染料的吸附行为。所有这些聚合物海绵对水中的亲水性染料都表现出高选择性的吸附。例如，SP-1对红素B的吸附容量高达150molmolg，是钙黄绿素的20倍。改性后的聚咖啡酸层使SP-2对亚甲基蓝(180molm ol/g)和SP-1(∼0μm ol/g)表现出不同的吸附性能，表明海绵的可裁剪结构可以调节其对客体分子的选择性。基于对客体分子的独特识别，利用这些海绵通过机械挤压或快速过滤的方法实现了水中染料混合物的动态分离，为净水提供了一种简便、易操作的替代方案。
Polymer sponges with molecular recognition provide a facile approach to water purification and industrial separation with easy operation, but its fabrication is still challenging because some critical issues of selective adsorption, high mechanical strength, and easy collection/re-use are difficult to be achieved in one material. Here, inspired by natural sponges, novel multifunctional polymer sponges were developed which were fabricated by ice-templating with multifunctional amine polyethylenimine and diepoxide cross-linker poly(ethylene glycol) diglycidyl ether for highly efficient harvesting of dyes and simultaneous pure water recovery both in mechanic pressing and filtration processes. The as-prepared sponge (SP-1) was further modified by poly(caffeic acid) through a simple dipping–cross-linking process to obtain the hybrid polymer sponge (SP-2), which showed higher compressive strength than SP-1. These sponges possessed a cross-linked three-dimensional macroporous structure with quick water absorbing properties over ten times of their own weight within 20 s directed by capillary. The adsorption behavior of the obtained polymer sponges to 11 hydrophilic dyes was studied in detail by mechanic induced separation. All these polymer sponges exhibited a high selective adsorption to hydrophilic dyes in water. For example, SP-1 has high adsorption capacity over 150 μmol/g to erythrosin B, which is 20 times higher than that of calcein. With the modified poly(caffeic acid) layer, SP-2 exhibited different adsorption properties for methylene blue (180 μmol/g) to SP-1 (∼0 μmol/g), indicating that the tailorable structures of the sponge can regulate their selectivity to guest molecules. Based on the unique recognition to guest molecules, the methodology of dynamic separation of the dye’s mixture in water was demonstrated by using these sponges through mechanical pressing or fast filtration, which provides a facile alternative with easy operation for water purification.