Influence of the pH value on the degradation of an azo dye of methyl orange by air discharge plasma | Zendy

Chen Qiang | Zendy; He Bangbang | Zendy; Ma Yupengxue | Zendy; Wang Xin | Zendy; Xiong Qing | Zendy; Li Junshuai | Zendy; Liu Qing Huo | Zendy

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Influence of the pH value on the degradation of an azo dye of methyl orange by air discharge plasma

Author(s) -

Chen Qiang,

He Bangbang,

Ma Yupengxue,

Wang Xin,

Xiong Qing,

Li Junshuai,

Liu Qing Huo

Publication year - 2019

Publication title -

plasma processes and polymers

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.644

H-Index - 74

eISSN - 1612-8869

pISSN - 1612-8850

DOI - 10.1002/ppap.201800152

Subject(s) - methyl orange , decomposition , chemistry , degradation (telecommunications) , plasma , orange (colour) , wastewater , ion , inorganic chemistry , nuclear chemistry , environmental engineering , organic chemistry , catalysis , telecommunications , physics , food science , photocatalysis , quantum mechanics , computer science , engineering

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 Fe 2+ ions is present in the MO solution, the MO decomposition can be promoted by Fenton's reaction (Fe 2+ reacts with H 2 O 2 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.

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