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针对芳香胺单体转化率较低、聚合反应氧化剂消耗量大等问题，研究了以间苯二胺和戊二醛为单体，通过醛氨缩合反应制备聚合席夫碱纳米粒子并用于吸附去除废水中的Cu(Ⅱ)。对产物的形貌及结构进行了表征，并探讨了该材料的热稳定性和酸稳定性及其对废水中Cu(Ⅱ)的吸附机制。结果表明：氨基和醛基经亲核加成后生成席夫碱结构，产物为直径100～400 nm的球形纳米颗粒；聚合席夫的CN结构具有较好的热稳定性和酸稳定性，对Cu(Ⅱ)的吸附过程符合Langmuir等温吸附模型和准二级动力学模型的特征；在优化条件下，聚合席夫碱对Cu(Ⅱ)的平衡吸附量为116.30 mg/g,性能优于常见生物炭、磁性铁及其他高分子材料；聚合席夫碱对Cu(Ⅱ)的吸附机制主要为静电作用，并表现出较强的配位能力。
Abstract：To address the issues of low conversion rate of aromatic amine monomers and high consumption of oxidants in polymerization reactions, the synthesis of polymeric Schiff base nanoparticles using m-phenylenediamine and glutaraldehyde as monomers through aldol-amino condensation reaction and their application in the adsorption and removal of Cu(Ⅱ) from wastewater were investigated.The morphology and structure of the products were characterized, and the thermal stability, acid stability, and adsorption mechanism of the material for Cu(Ⅱ) in wastewater were analyzed.The results show that the amino and aldehyde groups underwent nucleophilic addition to form a Schiff base structure, and the products are spherical nanoparticles with diameters ranging from 100 to 400 nm.The CN structure of the polymeric Schiff base has good thermal stability and acid stability, and the adsorption process of Cu(Ⅱ) conforms to the characteristics of the Langmuir isothermal adsorption model and the pseudo-second-order kinetic model.Under optimized conditions, the equilibrium adsorption capacity of the polymeric Schiff base for Cu(Ⅱ) is 116.30 mg/g, which is superior to that of common biochar, magnetic iron, and other polymer materials.The adsorption mechanism of the polymeric Schiff base for Cu(Ⅱ) is mainly electrostatic interaction and show strong coordination ability.
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基本信息:
DOI：10.13355/j.cnki.sfyj.2025.03.008
中图分类号:O647.3;X703
引用信息:
[1]郑毅豪,任力理,程俐俐等.聚合席夫碱的制备及其对废水中Cu(Ⅱ)的吸附性能研究[J].湿法冶金,2025,44(03):342-352.DOI:10.13355/j.cnki.sfyj.2025.03.008.
基金信息:
江西省教育厅科技项目(GJJ210836)