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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 2:30 |
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Conference: Bucharest University Faculty of Physics 2021 Meeting
Section: Optics, Spectroscopy, Plasma and Lasers
Title:
Methylene blue dye decolorization in water using atmospheric pressure plasma jet immersed in liquid
Authors:
Sasa-Alexandra YEHIA (1,2), Maria ZARIF (1,3), Lavinia CARPEN (1,2), Bogdan BITA (1,2), Nicoleta PETREA (4), Sorin VIZIREANU (1),Gheorghe DINESCU (1,2)
*
Affiliation:
1)National Institute for Lasers, Plasma and Radiation Physics, 77125, Magurele – Bucharest, Romania
2)Faculty of Physics, University of Bucharest, 77125, Magurele – Bucharest, Romania
3)Faculty of Engineering in Foreign Languages, University “Politehnica” of Bucharest; 060042, Bucharest, Romania
4)Scientific Research Centre for CBRN Defense and Ecology, 041309 Bucharest, Romania
E-mail
sasa.yehia@inflpr.ro
Keywords:
wastewater decontamination, filamentary plasma jet, methylene blue dye decolorization
Abstract:
One of the main environmental problems is water pollution from colored dyes due to the increasing the global textile industrial developments. This wastewater contains organic dyes which have non-biodegradable aromatic structure [1]. These dyes are toxic for human body and may be responsible for various illnesses. Several techniques have been developed for organic dyes degradation: photo-catalysis, chemical decontamination, UV light exposure, biological degradation. Chemical and biological decontamination involves major disadvantages due to the use of strong chemicals which affect the quality of water and the low efficiency in the removal of pollutants [2].
Atmospheric pressure plasma treatments are considered a promising method for water decontamination due to their potential for environment, biomedical and material processing application [3]. In this contribution we report the dielectric barrier discharge (DBD) filamentary plasma jet sources for intentionally contaminated water with Methylene Blue dye (MB, C16H18ClN3S), in concentration of 25 mg/L. These sources are very versatile, because they can operate at atmospheric pressure immersed in liquids within a large domain of parameters (various gases types, flow rates, and powers). These DBD sources have the advantage of not implying additional cooling systems. In order to identify the optimal dye decolorization conditions we varied several conditions: the gas flow rate (Ar 1000–20,000 sccm), the RF (radiofrequency) power values (50–200W), and the discharge geometry configuration. In addition, the influence of reactive gases (e.g. nitrogen, oxygen, compressed air and helium) and photocatalysts (e.g. Ce2O, TiO2, GO+TiO2) were also tested. Optical emission spectroscopy (OES) investigations were performed for plasma analysis and the decolorization process was evaluated by absorption spectroscopy. The decolorization time of MB (50mL, conc. 25 mg/L) varied from 30 to 13 min after increasing the Ar gas flow. The shortest decolorization time (6 min) was achieved for argon and nitrogen gas mixture (Ar/ 10%N2).
References:
[1] E. Abdel-Fattah et.al./Journal of Electrostatics 101 (2019) 103360
[2] S.A. Yehia et.al./Plasma Chemistry and plasma processing 40 (2020)1485-1505
[3] S.Vizireanu et. al./SCIENTIFIC REPORTS 8, 15473 (2018).
Acknowledgement:
This work was supported by project number PN-III-P1-1.2 PCCDI-2017-0637/33 PCCDI-MultiMonD2 within PNCDI III.
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