Dye-based water pollution is a subject of great concern as it has been linked to many health hazards. Considering their stable structures, some dyes, such as methylene blue (MB), cannot be easily removed from water. However, recent studies show that plasma-assisted processing has great potential for eliminating these dyes from water bodies. Among the different configurations of plasmas, discharges in gaseous bubbles in water are particularly promising in terms of water processing. The bubble-liquid discontinuity in such plasmas significantly facilitates the occurrence of discharge, and the modification of gas composition allows for controlling induced chemical reactions. In this study, we investigate the degradation of MB using pulsed discharges (amplitude of 20 kV, pulse duration of 500 ns, and repetition rate of 1 kHz) in Ar, O2, and N2 gaseous bubbles dispersed in water. The degradation of MB is evaluated in the direct mode, i.e., MB is present in the water during discharge as well as in the postprocessing mode, i.e., MB is added to water after plasma processing. Based on the obtained results, the most and least efficient degradation rates measured in the direct mode are achieved with O2 and N2 bubbles, respectively. Meanwhile, in the case of the postprocessing mode, degradation with N2 bubbles is initially more efficient than that with O2 or Ar. However, after hundreds of hours, higher degradation efficiency (up to 100%) is observed with O2 and Ar gas bubbles and not with N2. The findings reported herein are of great importance, particularly considering that plasma processing is complementary to the conventional techniques used in water depollution applications.
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September 2022
Research Article|
August 08 2022
Degradation of methylene blue by pulsed nanosecond discharge in Ar, O2, and N2 gaseous bubbles in water: Evaluation of direct and postprocessing modes
Special Collection:
Atmospheric Plasma-Liquid Interfaces
Naomi Bourbeau;
Naomi Bourbeau
(Data curation)
Groupe de physique des plasmas, Département de Physique, Université de Montréal
, 1375 Avenue Thérèse-Lavoie-Roux, Montréal H2V 0B3, Québec, Canada
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Laure Soussan;
Laure Soussan
(Data curation)
Groupe de physique des plasmas, Département de Physique, Université de Montréal
, 1375 Avenue Thérèse-Lavoie-Roux, Montréal H2V 0B3, Québec, Canada
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Ahmad Hamdan
Ahmad Hamdan
a)
(Conceptualization, Formal analysis, Funding acquisition, Investigation, Methodology, Project administration, Supervision, Writing – original draft, Writing – review and editing)
Groupe de physique des plasmas, Département de Physique, Université de Montréal
, 1375 Avenue Thérèse-Lavoie-Roux, Montréal H2V 0B3, Québec, Canada
a)Author to whom correspondence should be addressed: [email protected]
Search for other works by this author on:
Groupe de physique des plasmas, Département de Physique, Université de Montréal
, 1375 Avenue Thérèse-Lavoie-Roux, Montréal H2V 0B3, Québec, Canada
a)Author to whom correspondence should be addressed: [email protected]
Note: This paper is part of the Special Topic Collection on Atmospheric Plasma-Liquid Interfaces.
J. Vac. Sci. Technol. A 40, 053003 (2022)
Article history
Received:
May 16 2022
Accepted:
July 08 2022
Citation
Naomi Bourbeau, Laure Soussan, Ahmad Hamdan; Degradation of methylene blue by pulsed nanosecond discharge in Ar, O2, and N2 gaseous bubbles in water: Evaluation of direct and postprocessing modes. J. Vac. Sci. Technol. A 1 September 2022; 40 (5): 053003. https://doi.org/10.1116/6.0001968
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