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Photoreduction of 4-nitroaniline to p-phenylenediamine over TiO2, ZnO, PbBi2Nb2O9 and CdS photocatalysts in the presence of CH3OH was investigated under light irradiation (hv≥band gap) upon purging with N2. Compared with PbBi2Nb2O9 and CdS, TiO2 and ZnO showed photocatalytic activities for the photoreduction of 4-nitroaniline. Electron spin resonance analysis results revealed that a methanol radical could be detected in the present of TiO2 and ZnO. Its formation was attributed to the reaction between the hydroxyl radical and CH3OH molecule. The species had strong reductive ability, and therefore could reduce 4-nitroaniline to p-phenylenediamine. Other alcohols (C2H5OH and i-C3H7OH) were also found to be efficient additives for the photoreduction of 4-nitroaniline. The results of the 2H-labeled experiments indicated that the p-phenylenediamine formation was formed by the hydrogen transfer reaction between the 4-nitroaniline and H2O molecules. A mechanism was proposed to explain the photoreduction of 4-nitroaniline to p-phenylenediamine in the present alcohols. © 2012 Elsevier B.V.
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Applied Catalysis B: Environmental
ISSN： 0926-3373
Year： 2013
Volume： 130-131
Page： 163-167
6 . 0 0 7
JCR@2013
2 0 . 3 0 0
JCR@2023
JCR Journal Grade：1
CAS Journal Grade：1
Cited Count：
SCOPUS Cited Count： 58
ESI Highly Cited Papers on the List： 0 Unfold All
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30 Days PV： 0
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