Kinetic enhancement in photocatalytic oxidation of organic compounds by WO3 in the presence of Fenton-like reagent
- Kinetic enhancement in photocatalytic oxidation of organic compounds by WO3 in the presence of Fenton-like reagent
- 이홍신; 최지현; 이석헌; 윤성택; 이창하; 이재상
- Photocatalysis; Tungsten oxide; Fenton reaction; Advanced oxidation technology; Visible light activity
- Issue Date
- Applied catalysis B, Environmental
- VOL 138-139, 311-317
- WO3-mediated photocatalytic oxidation is achievable in the presence of electron acceptors as an alternative
to O2 or co-catalysts enabling O2 reduction pathway. This study suggests the combination with
Fenton-like reagent (Fe(III)/H2O2) as a strategy to improve the photocatalytic activity of WO3. Under
neutral pH condition where Fe(III) is present as iron oxide precipitate, photocatalytic degradation of 4-
chlorophenol (4-CP) proceeded 3-fold faster in the WO3/Fe(III)/H2O2 system relative to the WO3/H2O2
system, while no noticeable oxidation occurred in the systems of Fe(III)/H2O2, WO3, and WO3/Fe(III).
Such efficacy increase at circumneutral pH was observed in photocatalytic oxidation of diverse organics
including phenol, bisphenol A, acetaminophen, and carbamazepine. Compatible with the pH dependence
of photocatalytic activity of the WO3/Fe(III)/H2O2 system, hydroxylation of benzoic acid and coumarin as
indirect indication for OH radical production was drastically retarded with increasing pH. The pH effect
indicates that OH radical as primary oxidant may be responsible for the kinetic enhancement in the
WO3/Fe(III)/H2O2 system. In that platinum deposits or Nafion layers as physical barriers possibly inhibit
surface Fe(III) precipitation, use of platinized or Nafion-coated WO3 caused the negligible photocatalytic
improvement in the ternary system. Effective oxidative degradation in the presence of the UV cut-off
filter corroborated visible light activation of the WO3/Fe(III)/H2O2 system.
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