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ZIF-67 metal-organic frameworks and CNTs-derived nanoporous carbon structures as novel electrodes for flow-electrode capacitive deionization

电容去离子 海水淡化 材料科学 电极 泥浆 化学工程 电化学 纳米孔 纳米技术 复合材料 化学 生物化学 工程类 物理化学
作者
Ngo Minh Phuoc,Nguyen Anh Thu Tran,Tran Minh Khoi,Hye Bin Jung,Wook Ahn,Euiyeon Jung,Chung‐Yul Yoo,Hong Suk Kang,Younghyun Cho
出处
期刊:Separation and Purification Technology [Elsevier]
卷期号:277: 119466-119466 被引量:28
标识
DOI:10.1016/j.seppur.2021.119466
摘要

Capacitive deionization (CDI) has been attracting great interest as a promising desalination technology during the last decade because of its energy, cost effectiveness, and eco-friendly process. In particular, CDI using flowable electrodes (FCDI) offers a continuous desalination stream without the need for discharging and much better salt removal than that of conventional CDI desalination technologies. Nevertheless, FCDI desalination still suffers from the inherent low electrical conductivity of its liquid slurry electrode, which results in high internal and interfacial resistances and limits the salt-removal performance of the FCDI desalination system. In this study, in order to improve the electrical conductivity of flow electrodes, we synthesized zeolitic imidazolate frameworks (ZIF-67), made of the widely investigated Zn/Co-based MOFs, onto CNT templates ([email protected]) and investigated their FCDI desalination performance. The salt removal rate for [email protected] included flow electrodes reached 1.09 mmol/m2s, which is a 57% increase over that of pristine AC (0.69 mmol/m2s), with a salt-removal efficiency of 37.3%. Electrochemical analyses including CV and EIS measurements confirmed that such improved salt removal performance originates from the enhanced electrical conductivity by the formation of a conducting bridge between the suspended AC particles in the slurry electrodes.
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