Abstract

A dicarboxylic acid Schiff base ligand was synthesized via condensation of 2-hydroxybenzaldehyde with 5-aminoisophthalic acid. The derived monomer was reacted with 4,4′-diaminodiphenyl ether and triphenyl phosphite (TPP) in tetrabutylammonium bromide (TBAB) molten ionic liquid as a green solvent to form an aromatic polyamide with a moderate yield (71%) and inherent viscosity (0.2 dL g⁻¹). The nanostructured copper(II)/polyamide complex was then prepared. The structure, optical properties, and morphology of the compositions were confirmed by FT-IR, ⁻¹H-NMR, elemental analysis, UV-Vis, powder X-ray diffraction (XRD), thermogravimetric analysis (TGA) and field emission scanning electron microscopy (FE-SEM). The polyamide ligand and its nanostructured complex were comparatively applied in the elimination of Pb(II) ions from aqueous solutions.

Graphical abstract

摘要

通过2-羟基苯甲醛与5-氨基间苯二甲酸的缩合合成二羧酸席夫碱配体。在作为绿色溶剂的四丁基溴化铵（TBAB）熔融离子液体中，将衍生的单体与4,4'-二氨基二苯醚和亚磷酸三苯酯（TPP）反应，以中等收率（71％）和比浓对数粘度（0.2）形成芳族聚酰胺dL g ^-1）。然后制备了纳米结构的铜（II）/聚酰胺配合物。组合物的结构，光学性质和形态通过FT-IR ^-1确认。H-NMR，元素分析，UV-Vis，粉末X射线衍射（XRD），热重分析（TGA）和场发射扫描电子显微镜（FE-SEM）。聚酰胺配体及其纳米结构的络合物被比较地应用于消除水溶液中的Pb（II）离子。