Potassium-Ion Recovery with a Polypyrrole Membrane Electrode in Novel Redox Transistor Electrodialysis

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	Potassium-Ion Recovery with a Polypyrrole Membrane Electrode in Novel Redox Transistor Electrodialysis
	Zhou, Yi; Hu, Chengzhi; Liu, Huijuan; Qu, Jiuhui
刊名	ENVIRONMENTAL SCIENCE & TECHNOLOGY
	2020-04-07
卷号	54 期号:7 页码:4592-4600
ISSN号	0013-936X
英文摘要	Conductive polymers are potential selective ionexchange membrane materials. In this study, a novel redox transistor electrodialyzer consisting of two chambers separated by a polypyrrole (PPy) membrane electrode was designed for potassium ion (K+) recovery from water. The PPy membrane electrode was fabricated by depositing PPy on a stainless-steel wire mesh through the electrochemical method. Based on ion-exchange results, the PPy membrane exhibited electrodialysis selectivity for in the presence of Na+, with a K+/Na+ separation factor of 2.10. Adding modified active carbon to PPy provided a larger electroactive area and better conductivity, resulting in higher ion-exchange capacity (1.04 mmol/L) compared with the original PPy membrane. Even for seawater containing a very low concentration of K+ (16.18 mmol/L), the PPy membrane still demonstrated selectivity (separation factor of 2.18). Energy consumption in the electrodialyzer was 3.80 kW h/kg K, which was 37% lower than that in traditional electrodialysis. Furthermore, the PPy membrane exhibited antiscaling/fouling ability with the help of a pulse voltage. These findings highlight a novel redox transistor electrodialysis process with great potential application in K+ recovery from wastewater with relatively low energy consumption.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/44978]
专题	生态环境研究中心_环境水质学国家重点实验室
推荐引用方式 GB/T 7714	Zhou, Yi,Hu, Chengzhi,Liu, Huijuan,et al. Potassium-Ion Recovery with a Polypyrrole Membrane Electrode in Novel Redox Transistor Electrodialysis[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY,2020,54(7):4592-4600.
APA	Zhou, Yi,Hu, Chengzhi,Liu, Huijuan,&Qu, Jiuhui.(2020).Potassium-Ion Recovery with a Polypyrrole Membrane Electrode in Novel Redox Transistor Electrodialysis.ENVIRONMENTAL SCIENCE & TECHNOLOGY,54(7),4592-4600.
MLA	Zhou, Yi,et al."Potassium-Ion Recovery with a Polypyrrole Membrane Electrode in Novel Redox Transistor Electrodialysis".ENVIRONMENTAL SCIENCE & TECHNOLOGY 54.7(2020):4592-4600.