Electrically Switched Ion Exchange Based on Carbon-Polypyrrole Composite Smart Materials for the Removal of ReO4- from Aqueous Solutions
Electrically Switched Ion Exchange Based on Carbon-Polypyrrole Composite Smart Materials for the Removal of ReO4- from Aqueous Solutions
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DOI：
10.1021/acs.est.8b04789
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发表时间：
2019-03-05
影响因子：
11.4
通讯作者：
Lin, Yuehe
中科院分区：
文献类型：
--
作者：
Guo, Zizhang;Shams, Mehnaz;Lin, Yuehe
本文提出了一种基于电开关离子交换（ESIX）技术的简单、快速的去除水溶液中ReO 4-（TcO 4-的替代物）的方法。以活性炭和吡咯为原料，采用电沉积法制备了活性炭-聚吡咯（AC-PPy），并将其作为电开关离子交换剂用于去除ReO 4。表征结果表明，AC-PPy复合材料具有良好的负载能力和高的离子吸收和释放稳定性。计时电流研究表明，ESIX处理可以在60秒内完成，证明了离子的快速吸收和释放。通过具有耗散位移的电化学石英晶体微天平（EQCMD）研究来验证Re 〇 4的摄取和释放。通过调节AC-PPy的电化学电位，可以控制ReO 4-离子的吸收和释放。在循环伏安法（-0.4至0.8V）中用EQCMD进行五个循环观察到Re 04的吸收和释放的类似趋势。X射线光电子能谱（XPS）证实了AC-PPy复合材料中ReO 4-的去除过程。最后，智能材料显示出优异的效率和选择性，从水溶液中去除ReO 4-。
A simple and rapid process of ReO4- (as a surrogate of TcO4-) removal from aqueous solutions based on the electrically switched ion exchange (ESIX) method has been demonstrated in this work. Activated carbon-Polypyrrole (AC-PPy) was synthesized from activated carbon and pyrrole by electrodeposition method which was served as an electrically switched ion exchanger for ReO4- removal. The characterization results show that the AC-PPy composite exhibited an excellent loading capacity and a high stability for ions uptake and release. Chronoamperometric studies show that the ESIX treatment could be completed within 60 s, demonstrating the rapid uptake and release of ions. Uptake and release of Re04 was verified by electrochemical quartz crystal microbalance with dissipation shift (EQCMD) studies. By modulating the electrochemical potential of the AC-PPy, the uptake and release of ReO4- ions can be controlled. Similar trends of uptake and release of Re04were observed in cyclic voltammetry (-0.4 to 0.8 V) for five cycles with the EQCMD. X-ray photoelectron spectroscopy (XPS) confirmed the process of ReO4- removal in the AC-PPy composite. Conclusively, the smart material shows excellent efficiency and selectivity for the removal of ReO4- from aqueous solutions.