The characterization and application of prussian blue at graphene coated carbon fibers in a separated adsorption and electrically switched ion exchange desorption processes of cesium. (10th March 2017)

• Record Type: Journal Article
• Authors: Su, Jing-Yu; Jin, Guan-Ping; Chen, Tao; Liu, Xiao-Dong; Chen, Chun-Nian; Tian, Jing-Jing
• Is Part Of: Electrochimica acta. Volume 230(2017)
• Page Start: 399
• Page End: 406
• Publication Date: 2017-03-10
• Subjects: Electrochemical switch -- Characterization -- Prussian blue -- Cesium recovery; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2017.02.027
• Languages: English
• ISSNs: 0013-4686

Abstract

Graphical abstract: Highlights: Prussian blue/graphene/carbon fibers composite (PB/GN/CFs) was prepared by electrochemical method with rising specific surface area and ameliorative chemical stability. Characterization of PB/GN/CFs in a separated adsorption and electrically switched ion exchange desorption processes of cesium ions was investigated. PB/GN/CFs showed good regeneration ability and long-term cycle stability. PB/GN/CFs could be used to the recovery of cesium ions from the residual salt lake brine. Cesium ions could be desorbed in pH 2 0.1 M NH4 Cl with a significantly increased concentration. Abstract: Iron hexacyanoferrate/graphene/carbon fibers composite (PB/GN/CFs) was prepared by electrochemical method. Characterization of PB/GN/CFs in a separated adsorption and electrically switched ion exchange desorption processes (Ads-ESIX) of cesium ions (Cs + ) was confirmed by FE-SEM, XRD, IR, XPS and electrochemistry techniques. PB/GN/CFs displayed two quasi reversible transformations from Fe III 4 (Fe II (CN)6 )3 to Fe III 4 (Fe III (CN)6 Cl)3, or to (NH4 )4 Fe II 4 [Fe II (CN)6 ]3 at a potential range of −0.1–1.2 V in pH 2, 0.1 M NH4 Cl. The recovery of Cs + was investigated by PB/GN/CFs using Ads-ESIX method. Cs + could be selectively adsorbed by PB/GN/CFs from aqueous solution in pH 7.0, and desorbed in pH 2, 0.1 M NH4 Cl. The desorption rate of Cs + depended on the introduction of potential at PB/GN/CFs in pH 2, 0.1 M NH4 Cl. Both H3 O + and NH4 + could play dual role of electrolyte and competitor for the desorption of Cs + . PB/GN/CFs could be used to the recovery of Cs + from the residual salt lake brine in which potasium had been removed from Qarham playa of Qaidam Basin in China.