Electroanalysis with a single microbead of phosphate binding resin (FerrIX™) mounted in epoxy film
| Autor: | Rémi Castaing, Abigail K. Thompson, Philip J. Fletcher, Frank Marken, Klaus Mathwig |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Ion exchange Analytical chemistry 02 engineering and technology Microbead (research) Electrolyte Conductivity 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Phosphate 01 natural sciences 0104 chemical sciences Dielectric spectroscopy chemistry.chemical_compound Membrane chemistry Electrochemistry General Materials Science Electrical and Electronic Engineering 0210 nano-technology Voltammetry |
| Zdroj: | Journal of Solid State Electrochemistry. 25:2881-2891 |
| ISSN: | 1433-0768 1432-8488 |
| Popis: | Commercial resin microbeads are widely applied in ion exchange and extraction. Here, a single anion-selective and phosphate binding resin microbead (FerrIX™) is mounted into an epoxy membrane and investigated by 4-electrode membrane voltammetry and membrane impedance spectroscopy. Anion transport properties are observed to dominate associated with three distinct potential domains: (I) a low bias ohmic potential domain (dominant at high electrolyte concentration), (II) a concentration polarisation potential domain, and (III) an over-limiting potential domain. Voltammetric responses show transient diffusion-migration features at higher scan rates and quasi-steady state features at lower scan rates. Inherent microbead conductivity is shown to be linked to two resistive elements, electrolyte concentration dependent and independent, in series. The effects of phosphate binding are revealed as transient pattern in impedance spectroscopy data. Preliminary data suggest phosphate concentration-dependent peak features in the imaginary impedance versus frequency plot due to phosphate binding into the microbead. Graphical abstract |
| Databáze: | OpenAIRE |
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