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Oxidative Degradation of Nitrophenols in Aqueous Solution Induced by Plasma with Submersed Glow Discharge Electrolysis
Author(s) -
Gao Jinzhang,
Pu Lumei,
Yang Wu,
Yu Jie,
Li Yan
Publication year - 2004
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.200400012
Subject(s) - chemistry , aqueous solution , radical , nitrophenol , degradation (telecommunications) , electrolysis , hydroxyl radical , photochemistry , glow discharge , inorganic chemistry , catalysis , organic chemistry , plasma , electrode , telecommunications , physics , quantum mechanics , computer science , electrolyte
Summary: The oxidative degradation of 4‐nitrophenol, 2,4‐dinitrophenol, and 2,4,6‐trinitrophenol in aqueous solution induced by plasma with submersed glow discharge has been investigated. The reaction intermediates were determined by high performance chromatography (HPLC). Various influencing factors such as the initial pH, the concentration of nitrophenols (NPs), and the catalytic action of Fe 2+ were examined. The results indicate that the degradation pathways involve a slow opening of the aromatic ring followed by a rapid oxidation of the aliphatic compounds. The hydroxyl radicals are responsible for the primary attack of the NPs with formation of dihydroxynitrobenzenes. The attack of hydroxyl radical occurs at the ring positions activated by the presence of a phenolic OH group and a nitro group. The results suggested that the reaction obeyed a pseudo‐first order kinetic reaction and the proposed method is an efficient way for the nitrophenols degradation.Effect of pH on the degradation of 4‐nitrophenol.