Simultaneous oxidation of EDTA and reduction of metal ions in mixed Cu(II)/Fe(III)-EDTA system by TiO2 photocatalysis

Eun Hee Park, Jinho Jung, Hung Ho Chung

Research output: Contribution to journalArticle

46 Citations (Scopus)

Abstract

Both the photooxidation of EDTA and the photoreduction of metal ions in metal-EDTA systems were investigated. EDTA oxidation by TiO2 photocatalysis occurred sequentially as Cu(II)-EDTA > Cu(II)/Fe(III)-EDTA > Fe(III)-EDTA. For Cu(II)-EDTA, EDTA was completely decomposed after only 60 min of irradiation. The rate of EDTA decomposition was directly correlated with the initial Cu(II) concentration in the case of a mixed Cu(II)/Fe(III)-EDTA system. The metal ions in a single metal-EDTA complex were removed following significant decomposition of EDTA. For a mixed Cu(II)/Fe(III)-EDTA system, however, no copper was removed whereas almost all of the iron was removed. The iron and copper species deposited on the TiO2 surface were identified via EPR and XPS as mixed FeO/Fe3O4 and Cu0/Cu2O, respectively.

Original languageEnglish
Pages (from-to)432-436
Number of pages5
JournalChemosphere
Volume64
Issue number3
DOIs
Publication statusPublished - 2006 Jun 1

Fingerprint

Photocatalysis
EDTA
Edetic Acid
Metal ions
oxidation
Oxidation
ion
metal
Copper
Iron
Metals
Decomposition
Fe(III)-EDTA
Photooxidation
decomposition
copper
iron
Paramagnetic resonance
photooxidation
X ray photoelectron spectroscopy

Keywords

  • EDTA
  • Metal ions
  • Photocatalysis
  • Photooxidation
  • Photoreduction
  • TiO

ASJC Scopus subject areas

  • Environmental Chemistry
  • Environmental Science(all)

Cite this

Simultaneous oxidation of EDTA and reduction of metal ions in mixed Cu(II)/Fe(III)-EDTA system by TiO2 photocatalysis. / Park, Eun Hee; Jung, Jinho; Chung, Hung Ho.

In: Chemosphere, Vol. 64, No. 3, 01.06.2006, p. 432-436.

Research output: Contribution to journalArticle

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N2 - Both the photooxidation of EDTA and the photoreduction of metal ions in metal-EDTA systems were investigated. EDTA oxidation by TiO2 photocatalysis occurred sequentially as Cu(II)-EDTA > Cu(II)/Fe(III)-EDTA > Fe(III)-EDTA. For Cu(II)-EDTA, EDTA was completely decomposed after only 60 min of irradiation. The rate of EDTA decomposition was directly correlated with the initial Cu(II) concentration in the case of a mixed Cu(II)/Fe(III)-EDTA system. The metal ions in a single metal-EDTA complex were removed following significant decomposition of EDTA. For a mixed Cu(II)/Fe(III)-EDTA system, however, no copper was removed whereas almost all of the iron was removed. The iron and copper species deposited on the TiO2 surface were identified via EPR and XPS as mixed FeO/Fe3O4 and Cu0/Cu2O, respectively.

AB - Both the photooxidation of EDTA and the photoreduction of metal ions in metal-EDTA systems were investigated. EDTA oxidation by TiO2 photocatalysis occurred sequentially as Cu(II)-EDTA > Cu(II)/Fe(III)-EDTA > Fe(III)-EDTA. For Cu(II)-EDTA, EDTA was completely decomposed after only 60 min of irradiation. The rate of EDTA decomposition was directly correlated with the initial Cu(II) concentration in the case of a mixed Cu(II)/Fe(III)-EDTA system. The metal ions in a single metal-EDTA complex were removed following significant decomposition of EDTA. For a mixed Cu(II)/Fe(III)-EDTA system, however, no copper was removed whereas almost all of the iron was removed. The iron and copper species deposited on the TiO2 surface were identified via EPR and XPS as mixed FeO/Fe3O4 and Cu0/Cu2O, respectively.

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