Oxidation of parachloronitrobenzene in dilute aqueous solution by O3 + UV and H2O2 + UV: A comparative study

Journal Article · · Ozone: Science and Engineering (The Journal of the International Ozone Association); (United States)

DOI:https://doi.org/10.1080/01919519008552456· OSTI ID:5399621

Guittonneau, S; De Laat, J; Dore, M ^[1]; Bonnel, C ^[2]; Duguet, J P

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1. Universite de Poitiers (France)
2. Atochem, Levallois Perret (France)

This laboratory study was designed to investigate the degradation of 4-chloronitrobenzene ((CNB) = 2.4 {times} 10{sup {minus}6} mol L{sup {minus}1}; pH = 7.5) by H{sub 2}O{sub 2}/UV and by O{sub 3}/UV oxidation processes which involve the generation of very reactive and oxidizing hydroxyl free radicals. The effects of oxidant doses (H{sub 2}O{sub 2} or aqueous O{sub 3}), liquid flow rate (or the contact time), and bicarbonate ions acting as OH{center dot} radical scavengers on the CNB removal rates were studied. For a constant oxidant dose, the results show that the O{sub 3}/UV system appears to be more efficient than the H{sub 2}O{sub 2}/UV system to remove CNB because of the greatest rate of OH{center dot} generation by ozone photodecomposition compared to H{sub 2}O{sub 2} photolysis. However, for a given amount of oxidant decomposed, the H{sub 2}O{sub 2}/UV oxidant system was found to be more efficient than O{sub 3}/UV. Moreover, high levels of bicarbonate ions in solution (4 {times} 10{sup {minus}3} mol L{sup {minus}1}) significantly decrease the efficiency of CNB removal by H{sub 2}O{sub 2}/UV and by O{sub 3}/UV oxidation processes.

• OSTI ID: 5399621
• Journal Information: Ozone: Science and Engineering (The Journal of the International Ozone Association); (United States), Vol. 12:1; ISSN 0191-9512
• Country of Publication: United States
• Language: English

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54 ENVIRONMENTAL SCIENCES
01 COAL, LIGNITE, AND PEAT
NITROBENZENE
OXIDATION
ORGANIC CHLORINE COMPOUNDS
AQUEOUS SOLUTIONS
CHEMICAL INDUSTRY
CONTAMINATION
GROUND WATER
HYDROGEN PEROXIDE
OZONE
ULTRAVIOLET RADIATION
CHEMICAL REACTIONS
DISPERSIONS
ELECTROMAGNETIC RADIATION
HYDROGEN COMPOUNDS
INDUSTRY
MIXTURES
NITRO COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXYGEN COMPOUNDS
PEROXIDES
RADIATIONS
SOLUTIONS
WATER
540320* - Environment
Aquatic- Chemicals Monitoring & Transport- (1990-)
010900 - Coal
Lignite
& Peat- Environmental Aspects