1. Influence of the pH value on the degradation of an azo dye of methyl orange by air discharge plasma.
- Author
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Chen, Qiang, He, Bangbang, Ma, Yupengxue, Wang, Xin, Xiong, Qing, Li, Junshuai, and Liu, Qing Huo
- Subjects
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PLASMA flow , *AZO dyes , *HABER-Weiss reaction , *AIR - Abstract
Treatment of methyl orange (MO) synthetic wastewater by air discharge plasma was investigated, and the solution's pH value was found to be a key parameter of influencing the treatment efficiency. The results indicate that lower pH value can induce production of high reactive species, NO+ and peroxynitrous acid, which can contribute to the MO decomposition. When the appropriate amount of Fe2+ ions is present in the MO solution, the MO decomposition can be promoted by Fenton's reaction (Fe2+ reacts with H2O2 produced from the plasma–liquid interaction). Furthermore, the lower pH value is also beneficial for the Fenton's reaction by avoiding an appearance of Fe(OH)3 precipitate that can reduce the treatment efficiency. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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