Selective removal of chloride ions by bismuth electrode in capacitive deionization

doi:10.1016/j.seppur.2020.116600

	Selective removal of chloride ions by bismuth electrode in capacitive deionization
	Chang, Junjun 1,2,3; Li, Yuping 1,2,3; Duan, Feng 1,2; Su, Chunlei 1,2,3; Li, Yujiao 1,2,3; Cao, Hongbin 1,2
刊名	SEPARATION AND PURIFICATION TECHNOLOGY
	2020-06-01
卷号	240 页码:8
关键词	Bismuth electrode Selective removal Chloride ions Capacitive deionization
ISSN号	1383-5866
DOI	10.1016/j.seppur.2020.116600
英文摘要	Common methods in capacitive deionization (CDI) for selective removal are derived from membrane separation mechanism or size-based intercalation mechanism. In this study, based on the electrochemical activity of bismuth (Bi) material to chloride ions (Cl-) and inertness to sulfate ions (SO42-), Bi electrode is used as anode in CDI to selectively remove C-l- ions from mixed NaCl and Na2SO4 solution. Through the reaction with Bi, Cl- ions are stored in bismuth oxychloride (BiOCl). Results show that Bi electrode exhibits selectivity for Cl- over SO42- with a selectivity coefficient of more than 1.5 in solutions with mole ratio of Cl- to SO42- larger than 1. The selectivity coefficient is greatly dependent on the mole ratio of Cl- to SO42- and increases when the ratio rises. In solution with a fixed Cl-/SO42- mole ratio, higher applied voltage and prolonged time result in higher Cl- ion removal capacity, but not necessarily better selectivity. The highest selectivity coefficient of 4.5 is achieved in 8.5 mM NaCl and 1.1 mM Na2SO4 mixed solution at voltage of 1.6 and 2.0 V after charging for 1 h. These results demonstrate that Bi electrode can selectively remove Cl- ions from mixed solution with a relatively lower concentration of SO42- ions, which provides new insights into ion separation and selective removal by CDI.
资助项目	National Natural Science Foundation of China (NSFC)[21976180] ; National Natural Science Foundation of China (NSFC)[51878645]
WOS关键词	LAYERED DOUBLE HYDROXIDES ; ZINC-SULFATE ELECTROLYTE ; ANION-EXCHANGE MEMBRANE ; AQUEOUS-SOLUTION ; DESALINATION ; MONOVALENT ; WATER ; SEPARATION ; RECOVERY ; DIVALENT
WOS研究方向	Engineering
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000517659500019
资助机构	National Natural Science Foundation of China (NSFC)
内容类型	期刊论文
源URL	[http://ir.ipe.ac.cn/handle/122111/39498]
专题	中国科学院过程工程研究所
通讯作者	Cao, Hongbin
作者单位	1.Chinese Acad Sci, Inst Proc Engn, Key Lab Green Proc & Engn, Beijing 100190, Peoples R China 2.Chinese Acad Sci, Beijing Engn Res Ctr Proc Pollut Control, Inst Proc Engn, Beijing 100190, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Chang, Junjun,Li, Yuping,Duan, Feng,et al. Selective removal of chloride ions by bismuth electrode in capacitive deionization[J]. SEPARATION AND PURIFICATION TECHNOLOGY,2020,240:8.
APA	Chang, Junjun,Li, Yuping,Duan, Feng,Su, Chunlei,Li, Yujiao,&Cao, Hongbin.(2020).Selective removal of chloride ions by bismuth electrode in capacitive deionization.SEPARATION AND PURIFICATION TECHNOLOGY,240,8.
MLA	Chang, Junjun,et al."Selective removal of chloride ions by bismuth electrode in capacitive deionization".SEPARATION AND PURIFICATION TECHNOLOGY 240(2020):8.