Photochemistry in the mixed aqueous solution of nitrobenzene and nitrous acid as initiated by the 355 nm UV light.
The 355 nm photon-initiated microscopic reaction mechanisms of the mixed aqueous solution of nitrobenzene and nitrous acid in the presence or absence of O(2) were studied by the laser flash photolysis technique. The main transient absorption peaks in the recorded spectra were assigned and the growth/decay trends of several transient species were investigated. It was found that the OH radical formed from the photolysis of nitrous acid triggered most of the subsequent radical reactions. The rate constant of the reaction between OH radical and nitrobenzene was measured to be (3.4 +/- 0.1) x 10(9) l mol(-1) s(-1). The product from this reaction, namely C(6)H(5)NO(2)-OH adduct, was found to react with O(2) to yield C(6)H(5)NO(2)-OHO(2) adduct with a rate constant of (1.6 +/- 0.2) x 10(9) l mol(-1) s(-1). Final steady-state products were identified by GC/MS analysis and were in accordance with the transient spectroscopic results. The possible reaction pathways were proposed.
Zhu
Cheng-zhu
CZ
School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, PR China. czzhu11@hotmail.com
Ouyang
Bin
B
Wang
Jia-quan
JQ
Huang
Li
L
Dong
Wen-bo
WB
Hou
Hui-qi
HQ
D008401:Gas Chromatography-Mass Spectrometry; D017665:Hydroxyl Radical / Q000737:chemistry; D007834:Lasers; D009578:Nitrobenzenes / Q000737:chemistry / Q000528:radiation effects*; D009608:Nitrous Acid / Q000737:chemistry / Q000528:radiation effects*; D010100:Oxygen / Q000737:chemistry; D010782:Photolysis; D012996:Solutions; D014466:Ultraviolet Rays; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000528:radiation effects
D009578:Nitrobenzenes; D012996:Solutions; D014874:Water Pollutants, Chemical; D017665:Hydroxyl Radical; C036077:nitrobenzene; D010100:Oxygen; D009608:Nitrous Acid