Abstract
A solution of methylene blue dye was degraded under an atmospheric pressure plasma jet operating in a linear field configuration with pure argon or pure helium as working gases. Optical emission spectroscopy was carried out to understand the reactive species present with and without dye treatment. Both plasma jets contain reactive species such as OH, N2, and atomic oxygen (O). However, atomic oxygen takes a greatly different form depending on the working gas. In the argon plasma jet, we observe that most of the atomic oxygen produced is the O(1S)–O(1D) transition that also leads to the green colored plasma plume. On the other hand, the helium plasma jet produces the well known triplet states of oxygen at 777 and 844 nm. The absorption spectra confirmed the faster and more energy efficient degradation of the methylene blue dye when treated by the argon plasma jet. Argon plasma with enhanced atomic oxygen content can be utilized as a cheaper and efficient method for waste water treatment.
Highlights
Atmospheric pressure plasma jets (APPJs) have been widely utilized in the last couple of decades due to their various applications in technology and biomedicine.1–3 One interesting application of atmospheric pressure plasmas that has attracted research attention is the wastewater treatment of organic dyes
The atomic oxygen is contained within different states: the O(1S) at 557.7 nm for the argon plasma jet and non-metastable states for the helium plasma jet (777 and 844 nm)
Based on our optical emission spectroscopy (OES) measurements and previous modeling, we have provided an understanding of the reactions to produce the scitation.org/journal/adv reactive species responsible for methylene blue (MB) degradation
Summary
Atmospheric pressure plasma jets (APPJs) have been widely utilized in the last couple of decades due to their various applications in technology and biomedicine.1–3 One interesting application of atmospheric pressure plasmas that has attracted research attention is the wastewater treatment of organic dyes. Species that have been reported to contribute to MB degradation are hydrogen peroxide (H2O2), ozone (O3), and hydroxyl radicals (OH).16 The OH radical was reported to be critically important for MB degradation.13 Other reactive species such as atomic oxygen and excited argon14 present in plasma jets in high density might be useful for MB degradation and require more research.
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