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• W3002389519 endingPage "116600" @default.
• W3002389519 startingPage "116600" @default.
• W3002389519 abstract "• Bismuth (Bi) material is electrochemically active to Cl − and inert to SO 4 2− ions. • SO 4 2− ions decreases chloride storage capacity in Bi electrode. • Bi can selectively remove Cl − from mixed solution with lower SO 4 2− concentration. 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 (SO 4 2− ), Bi electrode is used as anode in CDI to selectively remove Cl − ions from mixed NaCl and Na 2 SO 4 solution. Through the reaction with Bi, Cl − ions are stored in bismuth oxychloride (BiOCl). Results show that Bi electrode exhibits selectivity for Cl − over SO 4 2− with a selectivity coefficient of more than 1.5 in solutions with mole ratio of Cl − to SO 4 2− larger than 1. The selectivity coefficient is greatly dependent on the mole ratio of Cl − to SO 4 2− and increases when the ratio rises. In solution with a fixed Cl − /SO 4 2− 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 Na 2 SO 4 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 SO 4 2− ions, which provides new insights into ion separation and selective removal by CDI." @default.
• W3002389519 created "2020-01-30" @default.
• W3002389519 creator A5000585588 @default.
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• W3002389519 date "2020-06-01" @default.
• W3002389519 modified "2023-10-16" @default.
• W3002389519 title "Selective removal of chloride ions by bismuth electrode in capacitive deionization" @default.
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• W3002389519 doi "https://doi.org/10.1016/j.seppur.2020.116600" @default.
• W3002389519 hasPublicationYear "2020" @default.
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