Enhanced degradation of aqueous methyl orange by contact glow discharge electrolysis using Fe2+ as catalyst

The enhanced degradation of methyl orange in aqueous solution was achieved by means of contact glow discharge electrolysis (CGDE) through adding a small amount of Fe 2+ to the solution. Methyl orange was degraded and eventually decomposed into inorganic carbon when CGDE was carried out under an appl...

Full description

Saved in:
Bibliographic Details
Published inJournal of applied electrochemistry Vol. 38; no. 12; pp. 1749 - 1755
Main Authors Gong, Jianying, Wang, Juan, Xie, Weijie, Cai, Weimin
Format Journal Article
LanguageEnglish
Published Dordrecht Springer Netherlands 01.12.2008
Subjects
Chemistry
Chemistry and Materials Science
Electrochemistry
Industrial Chemistry/Chemical Engineering
Original Paper
Physical Chemistry
Contact glow discharge
Degradation
Plasma
Fenton’s reaction
Methyl orange
Online AccessGet full text

Cover

More Information
Summary:The enhanced degradation of methyl orange in aqueous solution was achieved by means of contact glow discharge electrolysis (CGDE) through adding a small amount of Fe 2+ to the solution. Methyl orange was degraded and eventually decomposed into inorganic carbon when CGDE was carried out under an applied DC voltage of 480 V and a current of 65–80 mA. The oxidation process followed first-order kinetics; the degradation rate increased almost eight times in the presence of Fe 2+ . A reaction pathway is proposed based on analysis of the ultraviolet (UV) spectra of the solution and intermediate products from High Performance Liquid Chromatography-Mass Spectrometry (HPLC-MS). The addition of hydroxyl radicals promoted by the Fe 2+ catalyst is a key step in enhancing the whole oxidation process.
ISSN:0021-891X
1572-8838
DOI:10.1007/s10800-008-9626-z