Photo-oxidation of water sensitized by TiO2 and WO3 in presence of different electron acceptors

A. Mills; M. A. Valenzuela

Photo-oxidation of water sensitized by TiO₂ and WO₃ in presence of different electron acceptors

A. Mills, M. A. Valenzuela

Escuela Superior de Ingeniería Química e Industrias Extractivas (ESIQIE)

Research output: Contribution to journal › Article › peer-review

15 Scopus citations

Abstract

The photo-oxidation of water is studied in presence of UV-light (λ < 400 nm) using titanium dioxide (TiO₂) and tungsten oxide (WO₃, micro- and nano-crystalline) semiconductors in presence of different sacrificial electron acceptors (SEA): Fe(NO₃)₂, Na₂S₂O₈, Ce(SO₄)₂, Co[(NH₃)₅Cl]Cl₂, AgNO₃, HgCl ₂ and Cu(NO₃)₂. TiO₂ is 5 to 10 times more photoactive than WO₃ with reference to oxygen evolution. Ag ions are the best of the SEAs, for all the semiconductors tested in the photo-redox process. No oxygen evolution is observed when Hg²⁺ or Cu²⁺ ions are used as SEAs. The effect of high (10^-2 mol dm^-3) and low (10^-3 mol dm^-3) SEA concentrations is also studied but no common trend is observed. Instead, each system (i.e., SEA+H₂O+Semiconductor) exhibits a different behaviour and the results are rationalised in terms of the spectral and redox potential features of the system.

Original language	English
Pages (from-to)	287-296
Number of pages	10
Journal	Revista Mexicana de Fisica
Volume	50
Issue number	3
State	Published - Jun 2004

Keywords

Electron acceptor
Semiconductor photosynthesis
TiO
WO
Water oxidation

Cite this

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title = "Photo-oxidation of water sensitized by TiO2 and WO3 in presence of different electron acceptors",

abstract = "The photo-oxidation of water is studied in presence of UV-light (λ < 400 nm) using titanium dioxide (TiO2) and tungsten oxide (WO3, micro- and nano-crystalline) semiconductors in presence of different sacrificial electron acceptors (SEA): Fe(NO3)2, Na2S2O8, Ce(SO4)2, Co[(NH3)5Cl]Cl2, AgNO3, HgCl 2 and Cu(NO3)2. TiO2 is 5 to 10 times more photoactive than WO3 with reference to oxygen evolution. Ag ions are the best of the SEAs, for all the semiconductors tested in the photo-redox process. No oxygen evolution is observed when Hg2+ or Cu2+ ions are used as SEAs. The effect of high (10-2 mol dm-3) and low (10-3 mol dm-3) SEA concentrations is also studied but no common trend is observed. Instead, each system (i.e., SEA+H2O+Semiconductor) exhibits a different behaviour and the results are rationalised in terms of the spectral and redox potential features of the system.",

keywords = "Electron acceptor, Semiconductor photosynthesis, TiO, WO, Water oxidation",

author = "A. Mills and Valenzuela, {M. A.}",

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TY - JOUR

T1 - Photo-oxidation of water sensitized by TiO2 and WO3 in presence of different electron acceptors

AU - Mills, A.

AU - Valenzuela, M. A.

PY - 2004/6

Y1 - 2004/6

N2 - The photo-oxidation of water is studied in presence of UV-light (λ < 400 nm) using titanium dioxide (TiO2) and tungsten oxide (WO3, micro- and nano-crystalline) semiconductors in presence of different sacrificial electron acceptors (SEA): Fe(NO3)2, Na2S2O8, Ce(SO4)2, Co[(NH3)5Cl]Cl2, AgNO3, HgCl 2 and Cu(NO3)2. TiO2 is 5 to 10 times more photoactive than WO3 with reference to oxygen evolution. Ag ions are the best of the SEAs, for all the semiconductors tested in the photo-redox process. No oxygen evolution is observed when Hg2+ or Cu2+ ions are used as SEAs. The effect of high (10-2 mol dm-3) and low (10-3 mol dm-3) SEA concentrations is also studied but no common trend is observed. Instead, each system (i.e., SEA+H2O+Semiconductor) exhibits a different behaviour and the results are rationalised in terms of the spectral and redox potential features of the system.

AB - The photo-oxidation of water is studied in presence of UV-light (λ < 400 nm) using titanium dioxide (TiO2) and tungsten oxide (WO3, micro- and nano-crystalline) semiconductors in presence of different sacrificial electron acceptors (SEA): Fe(NO3)2, Na2S2O8, Ce(SO4)2, Co[(NH3)5Cl]Cl2, AgNO3, HgCl 2 and Cu(NO3)2. TiO2 is 5 to 10 times more photoactive than WO3 with reference to oxygen evolution. Ag ions are the best of the SEAs, for all the semiconductors tested in the photo-redox process. No oxygen evolution is observed when Hg2+ or Cu2+ ions are used as SEAs. The effect of high (10-2 mol dm-3) and low (10-3 mol dm-3) SEA concentrations is also studied but no common trend is observed. Instead, each system (i.e., SEA+H2O+Semiconductor) exhibits a different behaviour and the results are rationalised in terms of the spectral and redox potential features of the system.

KW - Electron acceptor

KW - Semiconductor photosynthesis

KW - TiO

KW - WO

KW - Water oxidation

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M3 - Artículo

SN - 0035-001X

VL - 50

SP - 287

EP - 296

JO - Revista Mexicana de Fisica

JF - Revista Mexicana de Fisica

IS - 3

ER -

Photo-oxidation of water sensitized by TiO₂ and WO₃ in presence of different electron acceptors

Abstract

Keywords

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