Abatement of the inhibitory effect of chloride anions on the photo-Fenton process.
The inhibition of the photo-Fenton (Fe2+/Fe3+, H2O2, UV light) degradation of synthetic phenol wastewater solutions by chloride ions is shown to affect primarily the photochemical step of the process, having only a slight effect on the thermal or Fenton step. Kinetic studies of the reactions of oxoiron (IV) (FeO2+) with phenol indicate that, if FeO2+ is formed in the photo-Fenton degradation, its role is probably minor. Finally, it is shown that, for both a synthetic phenol wastewater and an aqueous extract of Brazilian gasoline, the inhibition of the photo-Fenton degradation of the organic material in the presence of chloride ion can be circumvented by maintaining the pH of the medium at or slightly above 3 throughout the process, even in the presence of significant amounts of added chloride ion (0.5 M).
Machulek
Amilcar Júnior
AJ
Instituto de Química, Universidade de São Paulo, CP 26077, São Paulo 05513-970, Brazil.
Moraes
José E F
JE
Vautier-Giongo
Carolina
C
Silverio
Cristina A
CA
Friedrich
Leidi C
LC
Nascimento
Cláudio A O
CA
Gonzalez
Monica C
MC
Quina
Frank H
FH
D000838:Anions; D002384:Catalysis; D002712:Chlorides / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D010777:Photochemistry
D000838:Anions; D002712:Chlorides