Abstract
The total reduction of Cr(VI) by microsecond pin-to-pin electric discharge generated in aqueous solution has been reported. [Cr(VI)] and [H2O2] were measured simultaneously by UV–Vis absorption spectroscopy during the process. The kinetics of the Cr(VI) reduction resulting from the discharges is found to be pseudo zero order rate. The influence of the electron properties has been studied by varying the applied voltage and the electrode gap showing a better reduction for a higher electric field. In addition pH and conductivity of the solution have been measured before and after the process. The analysis of the chemical kinetics has been completed by varying the pulse duration of the discharge. The results show that the reduction occurs both during the plasma and the post plasma phases. It is also noted that the increase of the pulse duration involves a better Cr(VI) reduction, a higher [H2O2] production and a more important change in conductivity.
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Acknowledgements
This work bearing the reference ANR-11-LABX-086 has benefited from State aid managed by the National Research Agency under the Future Investments program with the Reference Number ANR-18-IDEX-0001. The authors thank Benjamin Dufour for valuable discussions about the chemical activity of water.
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Nguyen, T.S., Fagnon, N., Vega, A. et al. Cr(VI) Reduction by Microsecond Pin-to-Pin Discharges Generated in an Aqueous Solution. Plasma Chem Plasma Process 42, 1279–1290 (2022). https://doi.org/10.1007/s11090-022-10281-z
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DOI: https://doi.org/10.1007/s11090-022-10281-z