Remove of trace Al³⁺ from rare earth solutions is a challenging task. In the present study, an aluminum ion imprinted polymer (Al (III)-IIP) has been fabricated by surface-imprinting method. Al (III)-IIP was obtained by grafting silica gel with aminopropyl triethoxysilane and acrylic acid (AA). The structure and morphology of the polymer were characterized by Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), and thermogravimetric analysis (TG). The densification degree and the number of grafted functional groups were regulated by changing the synthesis conditions, and the optimal synthesis conditions are obtained as template ion: functional monomer: crosslinker = 1:8:8, and the optimal synthesis temperature is 333.15 K. The adsorption performance and selectivity properties of Al (III)-IIP were also investigated. The results show that at 298.15 K, the optimal pH for Al³⁺ adsorption is 4. The maximum adsorption capacity is 106.0 mg·g⁻¹ at an Al³⁺ ion concentration of 1000 mg·L⁻¹, which is 50% higher than that of reported recently. In addition, the adsorption process reaches equilibrium within 180 min. Furthermore, among many adsorption models and isothermal models, pseudo-second-order (PSO) adsorption model and Langmuir isothermal model are more suitable for the adsorption process. The selectivity coefficient of the Al³⁺ ion in binary mixtures of Nd³⁺, Ca²⁺ or Mg²⁺ are 17.76, 16.72 and 11.09, respectively. In addition, the adsorption mechanism of Al³⁺ is most probably caused by the formation of ionic bond between the Al³⁺ ions and the carboxyl functional groups on Al (III)-IIP and template effect. Results show that Al (III)-IIP has a great potential for a selective separation of aluminum ions from rare earth solutions.

去除痕量 Al ³⁺稀土解决方案是一项具有挑战性的任务。在本研究中，通过表面印迹法制备了一种铝离子印迹聚合物（Al（III）-IIP）。通过用氨基丙基三乙氧基硅烷和丙烯酸（AA）接枝硅胶获得Al（III）-IIP。通过傅里叶变换红外光谱（FT-IR）、扫描电子显微镜（SEM）和热重分析（TG）对聚合物的结构和形态进行了表征。通过改变合成条件来调节致密化程度和接枝官能团的数量，得到最佳合成条件为模板离子：功能单体：交联剂=1:8:8，最佳合成温度为333.15 K。还研究了 Al (III)-IIP 的吸附性能和选择性特性。³⁺吸附为4。在Al ³⁺离子浓度为1000 mg·L ^-1时最大吸附容量为106.0 mg·g ^-1，比最近报道的高50%。此外，吸附过程在 180 分钟内达到平衡。此外，在众多吸附模型和等温模型中，伪二级（PSO）吸附模型和Langmuir等温模型更适用于吸附过程。^{Nd 3+}、Ca ²⁺或Mg ²⁺二元混合物中Al ³⁺离子的选择性系数分别为17.76、16.72和11.09。此外，Al ^{3+的吸附机理}很可能是由于Al ³⁺离子与Al(III)-IIP上的羧基官能团之间形成离子键和模板效应引起的。结果表明，Al (III)-IIP 具有从稀土溶液中选择性分离铝离子的巨大潜力。