以1-乙烯基-3-苄基咪唑为阳离子单体,二甲基丙烯酸乙二醇酯(EGDMA)为交联剂,制备了一种新型交联咪唑基聚离子液体(PVIBn)吸附剂材料,采用核磁氢谱(1H-NMR)、红外光谱(FT-IR)、扫描电镜-能谱(SEM-EDS)和热重(TG)等手段表征结构,并将其用于废水处理。结果表明:PVIBn能有效分离阴离子和阳离子染料,尤其是对橙黄Ⅱ(AO7)具有高效的选择性吸附能力,7min内PVIBn对AO7的去除率即可达100%,最大吸附量高达1162mg/g。进一步从pH、吸附剂用量、吸附动力学(时间)和热力学(温度)等方面考察了其对AO7的吸附性能、吸附机理及可重复使用性,吸附过程符合Langmuir等温吸附模型和准二级动力学吸附模型;除了关键的静电相互作用外,PVIBn与AO7的芳香环之间还存在π-π共轭作用及范德华力;5次吸附与解吸后,对AO7的去除仍然可达98.3%。
A novel crosslinked imidazole-based polyionic liquid (PVIBn) adsorbent material was synthesized utilizing 1-vinyl-3-benzylimidazole as the cationic monomer and ethylene dimethacrylate (EGDMA) as the cross-linking agent.The structure of PVIBn was characterized using 1H-NMR,FT-IR,SEM-EDS,and TG,and it was subsequently applied to wastewater treatment.The results indicated that PVIBn exhibited effective separation of anionic and cationic dyes,particularly demonstrating excellent selective adsorption capacity for orange Ⅱ (AO7).The removal rate of AO7 by PVIBn reached 100% in just 7 minutes,with a maximum adsorption capacity of 1162mg/g.Furthermore,the adsorption performance,adsorption mechanism,and reusability of PVIBn for AO7 were investigated from the aspects of pH,adsorbent dosage,adsorption kinetics (time),and thermodynamics (temperature).The adsorption process conformed to the Langmuir isothermal adsorption model and the pseudo-second-order kinetic adsorption model.Besides the key electrostatic interactions,there were also π-π conjugation and van der Waals forces between the aromatic rings in AO7 and PVIBn.After 5 times of adsorption and desorption,the removal rate of AO7 could still reach more than 98.3%.
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基金资助
国家自然科学基金(22166013)
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