聚丙烯酰胺/海藻酸镧印迹聚合物凝胶球的制备及其对La(III)离子的吸附作用

Preparation of Polyacrylamide/Lanthanum Alginate Imprinted Polymer Gel Spheres and Their Adsorption of La(III) Ions

摘要: 以海藻酸钠为基础材料，结合离子印迹技术和La(III)离子进行交联处理，并通过聚丙烯酰胺的改性手段，我们开发了一种新型的聚丙烯酰胺/海藻酸镧印迹聚合物凝胶球(简称La-SA@PAM)。该材料在吸附效能、分离与富集效率、循环耐用性以及回收便利性等方面均展现出卓越的性能。通过SEM、XRD和Uv-vis，我们对其进行了结构的分析。在含La(III)废水处理的研究中，我们深入探讨了起始pH值、吸附时间及温度对La-SA@PAM吸附性能的具体影响。实验数据表明，在pH值为7.0且处于室温条件下，具备最大吸附容量达75.6 mg/g的高效吸附能力。La-SA@PAM的吸附动力学遵循拟二级模型，而其等温吸附特性则与Langmuir模型相符。La-SA@PAM的再生效率分别为99.52%、99.21%、98.04%、97.5%和80%，这充分证明了该材料至少能够高效循环使用四次以上。综上所述，La-SA@PAM印迹聚合物凝胶球在处理含La(III)废水方面展现出极大的应用潜力和广泛的前景。

Abstract: A new type of polyacrylamide/sodium alginate imprinted polymer gel spheres (referred to as La-SA@PAM) was developed by using lanthanum alginate as the matrix material, combined with ion imprinting technology and lanthanide ion cross-linking treatment, and modified by polyacrylamide. The material showed excellent performance in terms of adsorption efficacy, separation and enrichment efficiency, recycling durability and recycling convenience. We analysed the structure of the substance by SEM, XRD and Uv-vis. The specific effects of starting pH, adsorption time and temperature on the adsorption performance of La-SA@PAM were thoroughly investigated in the study of La(III)-containing wastewater treatment. The experimental data showed that the maximum adsorption capacity of 75.6 mg/g was achieved at pH 7.0 and room temperature. In addition, the adsorption kinetics of La-SA@PAM followed the proposed L2 model, and its isothermal adsorption characteristics were in accordance with the Langmuir model, with the maximum adsorption capacity up to 75.6 mg/g. In five consecutive adsorption-desorption cycling experiments, the adsorption capacity of the material was 99.21%, 98.04%, 97.5%, and 80%, which fully demonstrated that the material could at least remove La(III) efficiently and effectively. It is fully demonstrated that the material can be efficiently recycled at least four times. In conclusion, the La-SA@PAM polymer gel spheres have great potential and promising application in the treatment of La(III) wastewater.