A novel recyclable hyperbranched adsorbent for selective adsorption of Pb²⁺ ions is fabricated by a facile single-step crosslinking reaction. The as-synthesized adsorbent has porous structure and large of amino groups which beneficial for the removal of Pb²⁺ ions in aqueous solution and the removal efficiency is 99.2%. The result also indicates that adsorption ability of the obtained adsorbent increased with the increase of pH from 1 to 6 and temperature from 278 K to 308 K, respectively. The adsorption process of Pb²⁺ ions onto PPEI-2-AG followed the Langmuir isotherm model, and a kinetic study indicates that the process fitted pseudo-second order model well. The removal of Pb²⁺ ions by PPEI-2-AG is mainly controlled by the specific interactions between Pb²⁺ ions and amino functional groups, which could be further confirmed by X-ray photoelectron spectroscopy (XPS). The results demonstrate that PPEI-2-AG holds high potential in environmental remediation.

通过简单的一步交联反应，制备了一种新型的可回收的超支化吸附剂，用于选择性吸附Pb ²⁺离子。合成后的吸附剂具有多孔结构和大量的氨基，有利于水溶液中Pb ²⁺离子的去除，去除效率为99.2％。结果还表明，所获得的吸附剂的吸附能力分别随着pH从1增加到6和温度从278K增加到308K而增加。Pb ²⁺离子在PPEI-2-AG上的吸附过程遵循Langmuir等温模型，动力学研究表明该过程很好地拟合了伪二级模型。去除Pb ²⁺PPEI-2-AG离子主要受Pb ²⁺离子与氨基官能团之间的特定相互作用控制，这可以通过X射线光电子能谱（XPS）进一步证实。结果表明，PPEI-2-AG在环境修复方面具有很高的潜力。