Plasma and Fusion Research

Volume 14, 3406071 (2019)

Regular Articles

Plasma-Degradation of Dinitrophenols and Interpretation by the Molecular Orbital Theory
Hiroshi OKAWA, Hiroki KURODA, Keiko HIRAYAMA-KATAYAMA1), Shin-Ichiro KOJIMA2) and Tetsuya AKITSU1)
Happy Science University, 4427-1 Hitotsumatsu-Hei, Chosei, Chiba 299-4325, Japan
1)
University of Yamanashi, 4-3-11 Takeda, Kofu, Yamanashi 400-8511, Japan
2)
Kyushu University, Fukuoka 812-8581, Japan
(Received 8 January 2019 / Accepted 9 March 2019 / Published 25 April 2019)

Abstract

The advanced oxidation of 2, 4 - dinitrophenol (DNP), 2, 5 - DNP, and 3, 4 - DNP in aqueous solution has been investigated using a multi-gas, dielectric barrier discharge, and the degradation was measured by high performance liquid chromatography (HPLC). The acceleration of the advanced-oxidation has been investigated by the combination of the anion exchange polymer. The degradation pathway was suggested involving a rapid detachment of the nitro group followed by a slow opening of the aromatic-ring. The hydroxyl radical and the excited hydroxyl anion are responsible for the primary attack of the DNP with the production of dihydroxy-nitrobenzenes. The attack of hydroxyl radical occurs at the benzene ring carbon activated by the presence of a phenolic OH group and a nitro group. The reaction is dominated by a pseudo-first order kinetic reaction. The degradation process is interpreted using Molecular Orbital Theory.

Keywords

dielectric barrier discharge, aromatic compound, dinitrophenol, advanced oxidation, molecular orbital theory, advanced oxidation

DOI: 10.1585/pfr.14.3406071

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