Two imidazolium-based cationic polymeric nanotraps based on tetraphenylmethane building blocks (CPN-tpm) with different counterions were rationally designed and constructed for the efficient removal of Cr₂O₇^2- from wastewater. The influence of counterions on Cr₂O₇^2- adsorption performance was studied. With better wettability (contact angle as 28.61°), CPN-tpm-Cl exhibited a higher uptake capacity of 366 mg g⁻¹ for Cr₂O₇^2- capture and a faster ion exchange kinetic process in 20 min. While CPN-tpm-Br with a contact angle of 83.16° showed a lower maximum capacity of 324 mg g⁻¹. In addition, CPN-tpm-Cl can work in a wide pH range from 2 to 10 and possess excellent selectivity (such as Cl^-, NO₃^- and SO₄^2-) as well as good reusability for 5 times. Such excellent performances indicated that CPN-tpm-Cl is a promising candidate for the Cr₂O₇^2- capture application. Our work not only contributes cationic polymeric nanotraps as a promising candidate for Cr₂O₇^2- removal, but also suggests a new approach to develop new type of adsorbents for wastewater treatment.

合理设计和构建了两种基于具有不同抗衡离子的四苯甲烷结构单元 (CPN-tpm) 的咪唑基阳离子聚合物纳米捕集器，以有效去除废水中的 Cr ₂ O ₇ ^2-。研究了反离子对Cr ₂ O ₇ ^2-吸附性能的影响。具有更好的润湿性（接触角为 28.61°），CPN-tpm-Cl 表现出更高的 366 mg g ^-1捕获Cr ₂ O ₇ ^{2- 的}吸收能力和在 20 分钟内更快的离子交换动力学过程。而接触角为 83.16° 的 CPN-tpm-Br 显示出较低的最大容量为 324 mg g ^-1. 此外，CPN-tpm-Cl可在2至10的宽pH范围内工作，具有优异的选择性（如Cl ^-、NO ₃ ^-和SO ₄ ^2-）以及良好的5次重复使用性。如此优异的性能表明 CPN-tpm-Cl 是 Cr ₂ O ₇ ^2-捕获应用的有希望的候选者。我们的工作不仅有助于阳离子聚合物纳米陷阱作为去除Cr ₂ O ₇ ^2-的有希望的候选者，而且还提出了一种开发用于废水处理的新型吸附剂的新方法。