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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.