Theoretical treatment of diffusion and kinetics of osmium redox polymer mediated glucose oxidase enzyme electrodes: Analytical expression of current density for varying potential

Electrochemical detection of glucose was performed on carbon nanofibers containing an osmium based redox polymer and using glucose oxidase enzyme. Redox polymer assembled on the nanofibers provided a more stable support that preserved enzyme activity and promoted the electrical communication to the glassy carbon electrode. The morphologies, structures, and electrochemical behavior of the redox polymer modified nanofibers were characterized by scanning electron microscope, energy dispersive spectrometer and voltammetry. The glucose oxidase showed excellent communication with redox polymer as observed with the increased activity toward glucose. Both cyclic voltammetry and amperometry showed a linear response with glucose concentration. The linear range for glucose determination was from 1 to 12 mM with a relatively high sensitivity of 0.20±0.01 μA mM−1 for glucose oxidase in carbon nanofibers and 0.10±0.01 μA mM−1 without carbon nanofibers. The apparent Michaelis–Menten constant (Km) for glucose oxidase with carbon nanofibers was 0.99 mM. On the other hand, the Km value for the glucose oxidase without the nanofibers was 4.90 mM.

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Redox polymer films containing enzymes. 2. Glucose oxidase containing enzyme electrodes

The Journal of Physical Chemistry ◽

10.1021/j100168a047 ◽

1991 ◽

Vol 95 (15) ◽

pp. 5976-5980 ◽

Cited By ~ 173

Author(s):

Brian A. Gregg ◽

Adam Heller

Keyword(s):

Glucose Oxidase ◽

Polymer Films ◽

Redox Polymer ◽

Enzyme Electrodes

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Kinetics of Redox Polymer-Mediated Enzyme Electrodes

Journal of the American Chemical Society ◽

10.1021/ja0781543 ◽

2008 ◽

Vol 130 (26) ◽

pp. 8527-8536 ◽

Cited By ~ 131

Author(s):

Joshua W. Gallaway ◽

Scott A. Calabrese Barton

Keyword(s):

Redox Polymer ◽

Enzyme Electrodes ◽

Kinetics Of

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Electrochemical glucose biosensor based on an osmium redox polymer and glucose oxidase grafted to carbon nanotubes: A design-of-experiments optimisation of current density and stability

Electrochimica Acta ◽

10.1016/j.electacta.2021.137845 ◽

2021 ◽

Vol 371 ◽

pp. 137845

Author(s):

Kavita Jayakumar ◽

Richard Bennett ◽

Dónal Leech

Keyword(s):

Carbon Nanotubes ◽

Design Of Experiments ◽

Glucose Oxidase ◽

Current Density ◽

Glucose Biosensor ◽

Redox Polymer

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Comparative investigation on the removal of methyl orange from aqueous solution using three different advanced oxidation processes

International Journal of Chemical Reactor Engineering ◽

10.1515/ijcre-2020-0243 ◽

2021 ◽

Vol 0 (0) ◽

Author(s):

Zahia Benredjem ◽

Karima Barbari ◽

Imene Chaabna ◽

Samia Saaidia ◽

Abdelhak Djemel ◽

...

Keyword(s):

Methyl Orange ◽

Current Density ◽

Advanced Oxidation Processes ◽

Degradation Rate ◽

Supporting Electrolyte ◽

Advanced Oxidation ◽

Comparative Investigation ◽

Oxidation Processes ◽

The Comparative Study ◽

Kinetics Of

Abstract The Advanced Oxidation Processes (AOPs) are promising environmentally friendly technologies for the treatment of wastewater containing organic pollutants in general and particularly dyes. The aim of this work is to determine which of the AOP processes based on the Fenton reaction is more effective in degrading the methyl orange (MO) dye. The comparative study of the Fenton, photo-Fenton (PF) and electro-Fenton (EF) processes has shown that electro-Fenton is the most efficient method for oxidizing Methyl Orange. The evolution of organic matter degradation was followed by absorbance (discoloration) and COD (mineralization) measurements. The kinetics of the MO degradation by the electro-Fenton process is very rapid and the OM degradation rate reached 90.87% after 5 min. The influence of some parameters such as the concentration of the catalyst (Fe (II)), the concentration of MO, the current density, the nature and the concentration of supporting electrolyte was investigated. The results showed that the degradation rate increases with the increase in the applied current density and the concentration of the supporting electrolyte. The study of the concentration effect on the rate degradation revealed optimal values for the concentrations 2.10−5 M and 75 mg L−1 of Fe (II) and MO respectively.

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