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Phase-selective gelators based on benzene 1,3,5-tricarboxamide for aromatic solvents recovery and dye removal
Soft Materials ( IF 1.2 ) Pub Date : 2020-06-24 , DOI: 10.1080/1539445x.2020.1781656
Zhongxuan Li 1 , Hongmei Qu 1 , Yuanyuan Zhai 1 , Liqiang Liu 1
Affiliation  

ABSTRACT

Three supramolecular gelators (2a, 3a, 3b) of a benzene 1,3,5-tricarboxamide (BTA) motif were synthesized and studied for their gelation behavior. 3a and 3b were designed and synthesized for the first time. 3a showed excellent gelation behavior in a variety of aromatic solvents with minimum gel concentration in the range of 0.7% (w/v)–2.1% (w/v). The morphology of the stable gels indicated the formation of a highly entangled fiber network in mesitylene and xylene. FT-IR studies revealed an evident role of intermolecular hydrogen bonding in the self-assembly process. UV studies showed that π–π interaction is the driving force for the gelator to form a gel. The experiment results of the aromatic solvents recovery showed that the BTA-based gelator with naphthyl group exhibits excellent phase selectivity on gel mesitylene and xylene from a mixture of aromatic solvent and water when applied in the powder form at 3.2% (w/v) in mesitylene and 4.2% (w/v) in xylene. π-π stacking between phenyl groups and naphthyl groups of gelator might provide an additional driving force for the formation of a dense three-dimensional network capable of phase-selective gelation of aromatic solvents from a mixture of aromatic solvent and water. The experiment results of the dye removal indicated that the entangled fibrous network and the rheological property enable the BTA-based phase-selective gelator to be used as recyclable materials for removing toxic dyes from a mixed solution of water and organics with efficiency as high as 99.5%. And 3a can gel crude oil from a mixture of water and oil by using crude oil as carrier solvents. Thus, these smart systems possess the potential to be used effectively in water purification and oil spills remediation.



中文翻译:

基于苯1,3,5-三甲苯酰胺的相选择胶凝剂用于芳香族溶剂的回收和染料的去除

摘要

合成了苯1,3,5-三甲苯酰胺(BTA)基序的三种超分子凝胶剂(2a,3a,3b),并研究了它们的胶凝行为。首次设计并合成了3a和3b。3a在各种芳香族溶剂中表现出出色的胶凝行为,最小胶凝浓度在0.7%(w / v)–2.1%(w / v)的范围内。稳定凝胶的形态表明在均三甲苯和二甲苯中形成高度纠缠的纤维网络。FT-IR研究揭示了分子间氢键在自组装过程中的明显作用。紫外线研究表明,π-π相互作用是胶凝剂形成凝胶的驱动力。回收芳香族溶剂的实验结果表明,当以3.2%(w / v)的粉末状形式应用时,带有萘基的BTA型胶凝剂对凝胶均三甲苯和二甲苯表现出优异的相选择性,这是由芳香族溶剂和水的混合物形成的。均三甲苯和4.2%(w / v)的二甲苯溶液。胶凝剂的苯基和萘基之间的π-π堆积可能会为形成致密的三维网络提供额外的驱动力,该三维网络能够从芳族溶剂和水的混合物中进行相选择性胶凝化芳族溶剂。去除染料的实验结果表明,缠结的纤维网和流变性能使基于BTA的相选择胶凝剂可作为可回收材料用于从水和有机物的混合溶液中去除有毒染料,效率高达99.5。 %。并且3a可以通过使用原油作为载体溶剂从水和油的混合物中胶凝原油。因此,这些智能系统具有有效地用于水净化和溢油修复的潜力。

更新日期:2020-06-24
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