Development of an electrically switched ion exchange process for selective ion separations

Rassat, Scot D.; Sukamto, J. H.; Orth, R.J.; Lilga, Michael A.; Hallen, Richard T.

doi:10.1016/s1383-5866(98)00102-6

Cited by 105 publications

(96 citation statements)

References 24 publications

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“…The redox process in both solutions is reversible and the cation loading and unloading can be controlled. This result is in agreement with previous studies on NiHCF films prepared by different synthetic procedures and confirmed the ability of NiHCF-NT to be used for ion-exchange membranes [14,20,34].…”

Section: Electrochemical Behaviour and Functional Characterization Ofsupporting

confidence: 93%

“…Previous reports have demonstrated that Prussian blue and its related transition metal hexacyanoferrates such as NiHCF have characteristic ion-exchange behaviour [14,20,34,35]. These properties were used for selective removal of alkali metal ions such as radioactive cesium and sodium with great promise for development of ion-exchange membranes based on these materials.…”

Section: Electrochemical Behaviour and Functional Characterization Ofmentioning

confidence: 99%

“…Prussian blue and its related transition metal hexacyanoferrates (MeHCF) such as Ni hexacyanoferrates (NiHCF) are an emerging class of inorganic polymeric compounds that have been extensively studied in recent years because of their outstanding properties including, corrosion protection, electrocatalytic activity, electrochromism, molecular magnetism, supercapacitance, ionsensing and ion-exchange [7][8][9][10][11][12][13][14]. They have the general formula AM II [Fe III (CN) 6 ] where A is an alkali metal such as Na + , K + or Li + , and M II is a transition metal such as Fe III , Co II , or Ni II , with an almost cubic three-dimensional framework (zeolite-like structure) of repeating -NC-Fe-CN-M-NC units, in which the cyano-moiety with its carbon atom coordinating to an iron ion, and the nitrogen atom to an M ion forms the edge of the cube [7].…”

Section: Introductionmentioning

confidence: 99%

“…Among the metal substituted analogues of Prussian blue, NiHCF has been shown to exhibit particularly attractive electrochemical properties for development of reagent-free amperometric biosensors [8,15]. Most previous studies on NiHCF as an electrode material were based on thin films on conducting and planar substrates prepared by several methods, such as chemical deposition from mixtures of divalent nickel and ferrocyanide salts, layer-by-layer method, cathodic deposition from marginally stable electrolytes containing divalent nickel and ferricyanide, and electrochemical oxidation of nickel in ferricyanide solutions [14][15][16][17]. The ability to considerably improve existing catalytic properties of MeHCF was elegantly demonstrated in a recent report using nanostructured MeHCF electrodes for hydrogen peroxide detection [18,19].…”

Section: Introductionmentioning

confidence: 99%

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Electrochemical synthesis of nickel hexacyanoferrate nanoarrays with dots, rods and nanotubes morphology using a porous alumina template

Sabzi

Kant

Lošić

2010

Electrochimica Acta

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Section: Electrochemical Behaviour and Functional Characterization Ofsupporting

confidence: 93%

Section: Electrochemical Behaviour and Functional Characterization Ofmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Electrochemical synthesis of nickel hexacyanoferrate nanoarrays with dots, rods and nanotubes morphology using a porous alumina template

Sabzi

Kant

Lošić

2010

Electrochimica Acta

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“…The consequent dramatic changes in film lyophilicity drive solvent transfers into/out of the film [38][39][40] . Formally these can be expressed in terms of thermodynamic activity coefficients 41,42 , but quantitative predictions are not generally possible, so one must resort to experimental observations 43,44 .…”

Section: Introductionmentioning

confidence: 99%

Fundamental aspects of electrochemically controlled wetting of nanoscale composite materials

et al. 2017

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Electroactive films based on conducting polymers have numerous potential applications, but practical devices frequently require a combination of properties not met by a single component. This has prompted extension to composite materials, notably those in which particulates are immobilised within a polymer film. Irrespective of the polymer and the intended application, film wetting is important: by various means, it facilitates transport processes -of electronic charge, charge-balancing counter ions ("dopant") and analyte/reactant molecules -and motion of polymer segments. While film solvent content and transfer have been widely studied for pristine polymer films exposed to molecular solvents, extension to non-conventional solvents (such as ionic liquids) or to composite films has been given much less attention. Here we consider such cases, based on polyaniline films. We explore two factors: the nature of the electrolyte (solvent and filmpermeating ions) and the effect of introducing particulate species into the film. In the first instance, we compare film behaviours when exposed to a conventional protic solvent (water) with an aprotic ionic liquid (Ethaline) and the intermediate case of a protic ionic liquid (Oxaline). Secondly, we explore the effect of inclusion of physically diverse particulates: multi-walled carbon nanotubes, graphite or molybdenum dioxide. We use electrochemistry to control and monitor film redox state and change therein, and acoustic wave measurements to diagnose rheologically vs. gravimetrically determined response.The outcomes provide insights of relevance to future practical applications, including charge/discharge rates and cycle life for energy storage devices, "salt" transfer in water purification technologies, and the extent of film "memory" of previous environment when sequentially exposed to different media. 11,20 (including supercapacitors 21 ) and artificial muscles 22,23 . Inevitably, such applications require combinations of properties that are not generally found in a single material, so it is natural to move to composites. Additionally, it has become widely recognized that dynamics within such systems -from transport rates of charge balancing ions and analyte species to the nanomechanical motions of the polymer chains -are governed by the solvent content, i.e. the internal wettability of the material. In this study, we bring these two aspects together by exploring solvation phenomena for polyaniline composites containing multi-walled carbon nanotubes (MWCNTs), molybdenum dioxide and/or graphite when exposed to aqueous and room temperature ionic liquid media. KeywordsPolyaromatic conducting polymers, typified by polyaniline, may be interconverted between their insulating and conducting forms by electrochemically controllable redox processes 1,24 . Electron transfer at the electrode/polymer interface creates positive charge sites, for which electroneutrality requires the entry of anions (or exit of cations) at the polymer/solution interface 25 (colloquially, "(un-)doping"). T...

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Electrosorption

Hatton

2016

Kirk-Othmer Encyclopedia of Chemical Technology

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The topic of electrosorption is introduced, especially as it applies to electroseparations. Through the application of electrochemical potential, the interaction of target compounds with an electrode interface can be modulated, thus resulting in efficient and environmentally friendly applications.The major classes of separations utilizing electrosorption are discussed, and an overview of the most common materials chemistry is given. Capacitive deionization is an upcoming method for removing salt by using porous electrodes and the double layer, and in parallel, redox‐mediated separations based on Faradaic processes have been gaining intense attention for specialized separation processes.The various mechanisms for electrosorption as well as application fields are discussed, including water treatment, water purification, and chromatographic separations.

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Development of an electrically switched ion exchange process for selective ion separations

Cited by 105 publications

References 24 publications

Electrochemical synthesis of nickel hexacyanoferrate nanoarrays with dots, rods and nanotubes morphology using a porous alumina template

Electrochemical synthesis of nickel hexacyanoferrate nanoarrays with dots, rods and nanotubes morphology using a porous alumina template

Fundamental aspects of electrochemically controlled wetting of nanoscale composite materials

Electrosorption

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