title: Radiation-induced degradation of methyl orange in aqueous solutions.
abstract: Degradation of methyl orange under gamma-irradiation was investigated. The reactions followed pseudo first-order kinetics. Apparent degradation rate constant, estimated through linear regression analysis, increased with an increase of dose rate and a decrease of initial methyl orange concentration. Degradation of methyl orange was significantly accelerated under oxidative condition, but was slightly enhanced under reductive condition. However, the result of decoloration was better under reductive condition than oxidative one. An analysis on the intermediates using Fourier transform infrared and gas chromatography/mass spectrometry demonstrates that the radiolytic degradation of methyl orange was processed with different C-N cleavages under oxidative and reductive conditions.
authors.affiliation: Department of Chemistry, University of Science and Technology of China, Hefei 230026, China.
authors.forename: You-Peng
authors.initials: YP
authors.lastname: Chen
authors.forename: Shao-Yang
authors.initials: SY
authors.lastname: Liu
authors.forename: Han-Qing
authors.initials: HQ
authors.lastname: Yu
authors.forename: Hao
authors.initials: H
authors.lastname: Yin
authors.forename: Qian-Rong
authors.initials: QR
authors.lastname: Li
mesh_terms: D001391:Azo Compounds / Q000737:chemistry* / Q000528:radiation effects*; D002244:Carbon / Q000737:chemistry / Q000302:isolation & purification; D004396:Coloring Agents / Q000737:chemistry*; D005720:Gamma Rays; D008401:Gas Chromatography-Mass Spectrometry; D007700:Kinetics; D010084:Oxidation-Reduction / Q000528:radiation effects; D012996:Solutions; D013056:Spectrophotometry, Ultraviolet; D017550:Spectroscopy, Fourier Transform Infrared; D014867:Water / Q000737:chemistry*
chemical_list: D001391:Azo Compounds; D004396:Coloring Agents; D012996:Solutions; D014867:Water; C100258:methyl orange; D002244:Carbon