Electrochemical behavior of methyl viologen in zeolite particle films

Gemborys, Helen A.; Shaw, Brenda R.

doi:10.1016/0022-0728(86)90298-6

Cited by 84 publications

(68 citation statements)

References 11 publications

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“…Use of a mixed electrolyte system such as [NaCl+ TBABr] does not produce larger currents than those with NaCl alone [7]. Contrary to what is observed for films of MV2+-doped zeolite particles studied in an organic medium [14], in aqueous media, for combined electrolytes of the same concentration and sufficiently different cation sizes, the sampled currents are expected to have the same magnitude as those for the smallest cation alone.…”

Section: )mentioning

confidence: 83%

Cation determination in aqueous solution using the methyl viologen‐doped zeolite‐modified carbon paste electrode

Walcarius¹,

Lumberts²,

Derouane³

1995

Electroanalysis

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Methyl viologen (MV") initially exchanged in a zeolite Y modified carbon paste electrode (ZMCPE) is reduced after being exchanged for the supporting electrolyte cation. The use of an electrolyte cation that cannot enter zeolite channels to a great extent does not give rise to appreciable currents while a non-size-excluded cation allows liberating MV2+ from zeolite particles and their subsequent reduction at the electrode-solution interface. Following those observations, the MV2+-based ZMCPE has been used for the constant potential (-0.85 V) amperometric detection of nonreducible:, non-size-excluded cations in aqueous medium. The performance of this electrode was investigated in both batch injection analysis (BIA) and flow injection analysis (FIA). The great advantage of BIA coupled to the amperometric detection is the ability to use electrolyte-free sample solutions. For FIA experiments, dissolved oxygen was eliminated by using an electrochemical scrubber containing porous carbon electrodes. With the MV*+-doped ZMCPE, alkali and alkali-metal cations can be detected at the submillimolar level for both batch and flow injection analysis.

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Section: )mentioning

confidence: 83%

Cation determination in aqueous solution using the methyl viologen‐doped zeolite‐modified carbon paste electrode

Walcarius¹,

Lumberts²,

Derouane³

1995

Electroanalysis

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“…Solids were then ®ltered, copiously washed with pure water, and allowed to dry in air at room temperature. The exchange capacities were determined by ICP-AES (Plasma 2000, Perkin Elmer) after decomposition of the zeolite framework with citric acid (0.01 g ion-exchanged zeolites in 5.00 mL aqueous 0.1 M citric acid solution) leading to the leaching of exchanged ions into the solution [24]. Results from the chemical analysis of copper-loaded zeolites are summarized in Table 1.…”

Section: Electrode Preparationmentioning

confidence: 99%

Amperometric Detection of Nonelectroactive Cations in Electrolyte-Free Flow Systems at Zeolite Modified Electrodes

Walcarius¹,

Mariaulle

Louis

et al. 1999

Electroanalysis

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An electrochemical detector was designed and constructed, based upon a thin-layer cell with a working electrode prepared from carbon paste modi®ed with copper-(or silver-) exchanged zeolite particles. This electrode was then evaluated as a sensor for nonelectroactive cations in an electrolyte-free¯ow injection system and as an amperometric detector for suppressed ion chromatography. In the absence of supporting electrolyte, a higher signal-to-background ratio enhanced by about two order of magnitude the response obtained in electrolytic medium. Peak currents resulted from an important faradic component which was due to the electrochemical activity of the mediatorcontaining zeolites, while the capacitive counterpart was much lower. When applied to the analysis of alkali, alkaline earth metal and ammonium ions, in combination with a suppressed ion chromatography system, the zeolite-modi®ed detector gave rise to reproducible amperometric responses. This resulted in chromatograms comparable to those obtained simultaneously by using a conductivity detector in series, and any extra-column effects were never observed. The most sensitive responses were achieved when using zeolites displaying the largest pore size, the highest ion exchange capacity, and the most mobile mediator, to ensure the highest exchange rates for the analytes within the zeolite framework.

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“…Following Shaw et al [9], in the extrazeolitic mechanism, the electron transfer process takes place outside of the zeolite being preceded by the ion exchange of electroactive species with electrolyte cations, whereas in the intrazeolitic mechanism the electroactive species remains in the supercages of the outer cavities or subsurface zones of the zeolite. In the surface mediated electron transfer mechanism, electroactive species of the zeolite surface undergo initial electron transfer and subsequently experience outer-sphere electron transfer processes with intrazeolite species [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Electro- and magneto-electrochemistry of zeolite Y- and MCM-41-associated bipyrylium ion

Doménech

Garcı́a

Carbonell

2005

Journal of Electroanalytical Chemistry

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Electrochemical behavior of methyl viologen in zeolite particle films

Cited by 84 publications

References 11 publications

Cation determination in aqueous solution using the methyl viologen‐doped zeolite‐modified carbon paste electrode

Cation determination in aqueous solution using the methyl viologen‐doped zeolite‐modified carbon paste electrode

Amperometric Detection of Nonelectroactive Cations in Electrolyte-Free Flow Systems at Zeolite Modified Electrodes

Electro- and magneto-electrochemistry of zeolite Y- and MCM-41-associated bipyrylium ion

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