Preparation of reusable cross-linked amidoxime polyacrylonitrile microspheres and their efficient adsorption of Cu (II) and Pb (II)

聚丙烯腈 丙烯腈 吸附 聚合物 化学工程 材料科学 单体 朗缪尔吸附模型 溶剂 混溶性 高分子化学 化学 复合材料 有机化学 共聚物 工程类
作者
Guohang Zhou,Jiexiang Zeng,Song Tang,Zijian Bai,Jianyu Jiang,Hong Zhang,Yan Wang
出处
期刊:Polymer Bulletin [Springer Nature]
标识
DOI:10.1007/s00289-022-04534-2
摘要

Acrylonitrile (AN)-based polymers with fairly active nitrile groups can be modified as an ideal polymer-based adsorbent material. In this contribution, we proposed a "two-solvent system of water and glycerol" strategy to achieve the complete miscibility of monomers and we designed a cross-linked network structure to effectively improve the mechanical strength and reusability of the adsorbent. Morphological and structural characterization of the amidoxime cross-linked polyacrylonitrile microspheres (H-CAN) showed that these particles present a spherical structure with diameter of 200–300 nm, the expected cross-linked structure, and amorphous properties. The adsorption performance of H-CAN was investigated under different conditions of contact time, pH and temperature. The time to reach adsorption equilibrium at pH 7 and temperature 25 °C was 60 min (Cu (II)) and 40 min (Pb (II)), respectively. The results were in accordance with the Langmuir model, which showed the maximum adsorption of 140.33 and 113.13 mg·g−1 for Cu (II) and Pb (II), respectively. Moreover, the adsorption capacity after seven repetitions was 89.5% (Cu (II)) and 91.0% (Pb (II)) of the initial values. Overall, H-CAN has found wide promising applications in wastewater treatment, with the advantages of simple synthesis, mild application conditions, and satisfactory reusability.
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