Imidazolium-based cationic polymeric nanotraps for efficient removal of Cr2O72-
Imidazolium-based cationic polymeric nanotraps for efficient removal of Cr2O72-
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DOI：
10.1016/j.jece.2021.106357
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发表时间：
2021-12
影响因子：
7.7
通讯作者：
Xiaorui Li;Linfeng Jin;Lei Huang;Xueying Ge;Haoyu Deng;Hai-ying Wang;Yiming Li;L. Chai;
中科院分区：
文献类型：
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作者：
Xiaorui Li;Linfeng Jin;Lei Huang;Xueying Ge;Haoyu Deng;Hai-ying Wang;Yiming Li;L. Chai;
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构件（CPN-tpm）的咪唑基阳离子聚合物纳米捕集器，用于有效去除废水中的Cr2O72-。研究了抗衡离子对 Cr2O72 吸附性能的影响。 CPN-tpm-Cl 具有更好的润湿性（接触角为 28.61°），对 Cr2O72 的捕获能力高达 366 mg g−1，并且在 20 分钟内具有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的较宽pH范围内工作，并具有优异的选择性（如Cl-、NO3-和SO42-）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 Cr2O72 捕获应用的有前途的候选者。我们的工作不仅使阳离子聚合物纳米捕集器成为去除 Cr2O72 的有前景的候选材料，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。
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 Cr2O72-from wastewater. The influence of counterions on Cr2O72-adsorption performance was studied. With better wettability (contact angle as 28.61°), CPN-tpm-Cl exhibited a higher uptake capacity of 366 mg g−1for Cr2O72-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 SO42-) as well as good reusability for 5 times. Such excellent performances indicated that CPN-tpm-Cl is a promising candidate for the Cr2O72-capture application. Our work not only contributes cationic polymeric nanotraps as a promising candidate for Cr2O72-removal, but also suggests a new approach to develop new type of adsorbents for wastewater treatment.