A review on the visible light active titanium dioxide photocatalysts for environmental applications

M Pelaez, NT Nolan, SC Pillai, MK Seery, P Falaras, AG Kontos, PSM Dunlop, JWJ Hamilton, JA Byrne, K O'Shea, MH. Entezari, DD Dionysiou

Research output: Contribution to journalArticle

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Abstract

Fujishima and Honda (1972) demonstrated the potential of titanium dioxide (TiO2) semiconductor materials to split water into hydrogen and oxygen in a photo-electrochemical cell. Their work triggered the development of semiconductor photocatalysis for a wide range of environmental and energy applications. One of the most significant scientific and commercial advances to date has been the development of visible light active (VLA) TiO2 photocatalytic materials. In this review, a background on TiO2 structure, properties and electronic properties in photocatalysis is presented. The development of different strategies to modify TiO2 for the utilization of visible light, including non metal and/or metal doping, dye sensitization and coupling semiconductors are discussed. Emphasis is given to the origin of visible light absorption and the reactive oxygen species generated, deduced by physicochemical and photoelectrochemical methods. Various applications of VLA TiO2, in terms of environmental remediation and in particular water treatment, disinfection and air purification, are illustrated. Comprehensive studies on the photocatalytic degradation of contaminants of emerging concern, including endocrine disrupting compounds, pharmaceuticals, pesticides, cyanotoxins and volatile organic compounds, with VLA TiO2 are discussed and compared to conventional UV-activated TiO2 nanomaterials. Recent advances in bacterial disinfection using VLA TiO2 are also reviewed. Issues concerning test protocols for real visible light activity and photocatalytic efficiencies with different light sources have been highlighted.
LanguageEnglish
Pages331-349
JournalApplied Catalysis B: Environmental
Volume125
DOIs
Publication statusPublished - 2012

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Photocatalysts
Titanium dioxide
Photocatalysis
Disinfection
Semiconductor materials
Metals
Air purification
disinfection
Photoelectrochemical cells
Volatile Organic Compounds
Oxygen
Pesticides
Volatile organic compounds
Water treatment
Nanostructured materials
Electronic properties
Drug products
Light absorption
nonmetal
Light sources

Cite this

Pelaez, M., Nolan, NT., Pillai, SC., Seery, MK., Falaras, P., Kontos, AG., ... Dionysiou, DD. (2012). A review on the visible light active titanium dioxide photocatalysts for environmental applications. Applied Catalysis B: Environmental, 125, 331-349. https://doi.org/10.1016/j.apcatb.2012.05.036
Pelaez, M ; Nolan, NT ; Pillai, SC ; Seery, MK ; Falaras, P ; Kontos, AG ; Dunlop, PSM ; Hamilton, JWJ ; Byrne, JA ; O'Shea, K ; Entezari, MH. ; Dionysiou, DD. / A review on the visible light active titanium dioxide photocatalysts for environmental applications. In: Applied Catalysis B: Environmental. 2012 ; Vol. 125. pp. 331-349.
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Pelaez, M, Nolan, NT, Pillai, SC, Seery, MK, Falaras, P, Kontos, AG, Dunlop, PSM, Hamilton, JWJ, Byrne, JA, O'Shea, K, Entezari, MH & Dionysiou, DD 2012, 'A review on the visible light active titanium dioxide photocatalysts for environmental applications', Applied Catalysis B: Environmental, vol. 125, pp. 331-349. https://doi.org/10.1016/j.apcatb.2012.05.036

A review on the visible light active titanium dioxide photocatalysts for environmental applications. / Pelaez, M; Nolan, NT; Pillai, SC; Seery, MK; Falaras, P; Kontos, AG; Dunlop, PSM; Hamilton, JWJ; Byrne, JA; O'Shea, K; Entezari, MH.; Dionysiou, DD.

In: Applied Catalysis B: Environmental, Vol. 125, 2012, p. 331-349.

Research output: Contribution to journalArticle

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AU - Pelaez, M

AU - Nolan, NT

AU - Pillai, SC

AU - Seery, MK

AU - Falaras, P

AU - Kontos, AG

AU - Dunlop, PSM

AU - Hamilton, JWJ

AU - Byrne, JA

AU - O'Shea, K

AU - Entezari, MH.

AU - Dionysiou, DD

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AB - Fujishima and Honda (1972) demonstrated the potential of titanium dioxide (TiO2) semiconductor materials to split water into hydrogen and oxygen in a photo-electrochemical cell. Their work triggered the development of semiconductor photocatalysis for a wide range of environmental and energy applications. One of the most significant scientific and commercial advances to date has been the development of visible light active (VLA) TiO2 photocatalytic materials. In this review, a background on TiO2 structure, properties and electronic properties in photocatalysis is presented. The development of different strategies to modify TiO2 for the utilization of visible light, including non metal and/or metal doping, dye sensitization and coupling semiconductors are discussed. Emphasis is given to the origin of visible light absorption and the reactive oxygen species generated, deduced by physicochemical and photoelectrochemical methods. Various applications of VLA TiO2, in terms of environmental remediation and in particular water treatment, disinfection and air purification, are illustrated. Comprehensive studies on the photocatalytic degradation of contaminants of emerging concern, including endocrine disrupting compounds, pharmaceuticals, pesticides, cyanotoxins and volatile organic compounds, with VLA TiO2 are discussed and compared to conventional UV-activated TiO2 nanomaterials. Recent advances in bacterial disinfection using VLA TiO2 are also reviewed. Issues concerning test protocols for real visible light activity and photocatalytic efficiencies with different light sources have been highlighted.

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