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Novel Electrochemical Coupled Three-in-One Sensing System for Transforming Organic Pollutants into Green Fuels and Their Sensing

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Abstract

The organic pollutants present in wastewater produce greenhouse gas, CO2. Effective utilization of CO2 into valuable green fuels and its sensing is focused research area. Aiming above, this work is focused on fabrication of electrochemical coupled sensing system for degradation of 4-nitrophenol to CO2 from wastewater samples, electrochemical reducing system for transforming CO2 to alcohols and selective amperometric sensing system for quantifying alcohols. A graphene anchored iron oxide electrode was used as an electrocatalyst to facilitate the electrochemical oxidation process to mineralized organic pollutants into water and CO2. The CuO film on silicon substrate was used in cathodic compartment for converting CO2 to methanol and ethanol. Alcohol oxidase modified Au–Cu nanoparticle modified pencil graphite was selective sensing and quantifying the methanol and ethanol. The experimental results revealed that, graphene anchored iron oxide showed maximum degeneration of 4-nitrophenol 72% at 0.9 V. Furthermore, simultaneous reduction of CO2 at cathode gave good yield of the liquid fuels CH3OH and C2H5OH were 105.0 and 90.0 μmol/L respectively. In addition, Alcohol oxidase modified Au–Cu nanoparticles modified pencil graphite biosensor displays a linear response to both methanol and ethanol in the range 0.250–850 μmol/L with a detection limit of 0.07 μmol/L (S/N = 3) (RSD = 0.004 μA) and 0.7–800 μmol/L with detection limit of 0.068 μmol/L (S/N = 3) (RSD = 0.005 μA) with >40% quantitative yield. The response time is less than 50 s at ambient conditions. Consequently, the ethanol and methanol yield were obtained 30.0%. Our developed three-in-one provides a convenient, simple and reliable method to remediate polluted water and utilizing CO2 into green fuels.

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Authors and Affiliations

  1. Department of Chemistry, Dayananda Sagar College of Engineering, 560078, Bengaluru, India

    Indu Pandey, M. Sennappan & Periyakaruppan Karuppasamy

  2. L&T Technology Services Ltd. Bengaluru, 560045, Karnataka, India

    Jai Deo Tiwari

  3. Faculty of Engineering and Computing, Coventry University, Coventry, UK

    Ashish Shukla

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  1. Indu Pandey
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Indu Pandey, Tiwari, J.D., Shukla, A. et al. Novel Electrochemical Coupled Three-in-One Sensing System for Transforming Organic Pollutants into Green Fuels and Their Sensing. Russ J Electrochem 59, 1162–1175 (2023). https://doi.org/10.1134/S1023193523220044

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