Photocatalytic activity of silver-modified titanium dioxide at solid–liquid and solid–gas interfaces

Kőrösi, László; Papp, Szilvia; Ménesi, Judit; Illés, Erzsébet; Zöllmer, Volker; Richardt, André; Dékány, Imre

doi:10.1016/j.colsurfa.2007.11.030

Cited by 42 publications

(20 citation statements)

References 29 publications

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“…The use of chemical modifiers/dopants is one method of addressing the low transition temperature and issues regarding photocatalysis in TiO 2 . One type of doping involves the use of metal dopants such as iron [21][22][23][24], silver [15,25], chromium [26], copper [22,27,28], and manganese [29][30][31] or metal oxides such as Al 2 O 3 , SiO 2 and ZnO [11,14,[32][33][34]. However, as noted by Byrne et al the use of metal dopants can result in the formation of impurities at elevated temperatures which can have a negative impact on the transition temperature and photocatalytic activity [14,20,35].…”

Section: Introductionmentioning

confidence: 99%

Modification of TiO₂ with hBN: high temperature anatase phase stabilisation and photocatalytic degradation of 1,4-dioxane

Byrne¹,

Rhatigan²,

Hermosilla³

et al. 2019

J. Phys. Mater.

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This paper examines the modification of anatase TiO 2 with hexagonal boron nitride (hBN) and the impact this coupling has on the temperature of the anatase to rutile phase transition and photocatalytic activity. All samples were 100% anatase when calcined up to 500°C. At 600°C, all BN-modified samples contain mixed rutile and anatase phases, with 8% and 16% BN-TiO 2 showing the highest anatase contents of 64.4% and 65.5% respectively. The control sample converted fully to rutile at 600°C while the BN modified sample converted to rutile only at 650°C. In addition to TiO 2 phase composition, XRD also showed the presence of bulk boron nitride peaks, with the peak at 26°i ndicating the graphite-like hBN structure. Density functional theory calculations of hBN-rings adsorbed at the anatase (101) surface show strong binding at the interface; new interfacial bonds are formed with key interfacial features being formation of B-O-Ti and N-Ti bonds. Models of extended hBN sheets at the anatase (101) surface show that formation of B-O and N-Ti bonds along the edge of the hBN sheet anchor it to the anatase surface. 16% BN-TiO 2 at 500°C showed a significant increase in the photocatalytic degradation of 1,4-dioxane when compared with pure anatase TiO 2 at 500°C. This arises from the effect of hBN on anatase. The computed density of states (DOS) plots show that interfacing anatase with BN results in a red shift in the TiO 2 energy gap; N-p states extend the valence band maximum (VBM) to higher energies. This facilitates transitions from high lying N-p states to the Ti-d conduction band. A simple photoexcited state model shows separation of electrons and holes onto TiO 2 and BN, respectively, which promotes the photocatalytic activity.

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Section: Introductionmentioning

confidence: 99%

Modification of TiO₂ with hBN: high temperature anatase phase stabilisation and photocatalytic degradation of 1,4-dioxane

Byrne¹,

Rhatigan²,

Hermosilla³

et al. 2019

J. Phys. Mater.

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“…Since Fujishima's and Honda's pioneering work in 1972 [5], there has been a continuously growing interest in TiO 2 as a photocatalyst because of its efficiency, long term stability, cheapness and low toxicity [6][7][8][9]. Although TiO 2 is a good candidate for photocatalyst in general, especially in degradation of organic pollutants both in gas phase [7,10] and in liquid phase [7,[11][12][13] bare TiO 2 (in the absence of metal co-catalyst) results only in poor H 2 evolution in reaction (1) [14,15]. The activity of TiO 2 in the hydrogen producing reaction can be increased at least by an order of magnitude when a proper co-catalyst is involved [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Graphite Oxide-TiO2 Nanocomposite Type Photocatalyst for Methanol Photocatalytic Reforming Reaction

et al. 2018

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Graphite-oxide/TiO 2 (GO/TiO 2 ) composite materials were prepared by heterocoagulation method from Brodie's graphiteoxide (GO) in order to test them as catalysts in the methanol photocatalytic reforming reaction in liquid phase. The preparation of the composite itself resulted in only little changes in the structure of GO as it was indicated by attenuated total reflection infrared (ATR-IR) and 13 C magic-angle spinning nuclear magnetic resonance ( 13 C MAS NMR) spectroscopic measurements. However, during the photocatalytic reaction, all of the GO/TiO 2 samples darkened strongly indicating structural changes of GO. X-ray photoelectron spectroscopy along with NMR confirmed the loss of oxygen functionalities and emergence of graphitic species in the samples recovered from the photocatalytic reaction. Model experiments were designed to identify the key factors determining the activity of the GO/TiO 2 derived photocatalysts. It was found that the emergence of a pronounced coupling between TiO 2 and the graphite-like carbonaceous material is the most important contribution to get active and stable photocatalysts.

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“…Pure TiO 2 shows the smallest change, while COMP-Ag70 shows the largest change. Kőrösi et al showed that the rate of photooxidation of organic compounds was significantly enhanced by silver-modification of titania [39].…”

Section: Photo-responsive Activity Of Ag-np/tio 2 Composite Thin Filmsmentioning

confidence: 99%

Photocatalytic Activity of Vis-Responsive Ag-Nanoparticles/TiO2 Composite Thin Films Fabricated by Molecular Precursor Method (MPM)

et al. 2013

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Abstract:The Ag-nanoparticles (Ag-NP)/TiO 2 composite thin films with various amounts of Ag (10 mol% ≤ n ≤ 80 mol%) were examined as a potential photocatalyst by decoloration reaction of methylene blue (MB) in an aqueous solution. These composite thin films of ca. 100 nm thickness were fabricated by the MPM at 600 °C in air. The decoloration rates monitored by the absorption intensity of the MB solution indicated that the composite thin films of Ag with an amount less than 40 mol% are not effective under vis-irradiation, though they can work as a photocatalyst under UV-irradiation. Further, the UV-sensitivity of the composite thin films gradually decreased to almost half the level of that of the TiO 2 thin film fabricated under the identical conditions when the Ag amount increased from 10 to 40 mol%. Contrarily, the composite thin films of Ag content larger than 50 mol% showed the vis-responsive activity, whose level was slightly lower than the decreased UV-sensitivity. Diffuse reflectance spectra suggested that the vis-responsive OPEN ACCESSCatalysts 2013, 3 626 activity of the composite thin films is due to the conductivity, localized surface plasmon resonance and surface plasmon resonance of Ag-NP. It was also elucidated that the vis-responsive level of the composite thin films corresponds to their electrical conductivity that depends on the Ag content.

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Photocatalytic activity of silver-modified titanium dioxide at solid–liquid and solid–gas interfaces

Cited by 42 publications

References 29 publications

Modification of TiO₂ with hBN: high temperature anatase phase stabilisation and photocatalytic degradation of 1,4-dioxane

Modification of TiO₂ with hBN: high temperature anatase phase stabilisation and photocatalytic degradation of 1,4-dioxane

Graphite Oxide-TiO2 Nanocomposite Type Photocatalyst for Methanol Photocatalytic Reforming Reaction

Photocatalytic Activity of Vis-Responsive Ag-Nanoparticles/TiO2 Composite Thin Films Fabricated by Molecular Precursor Method (MPM)

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Photocatalytic activity of silver-modified titanium dioxide at solid–liquid and solid–gas interfaces

Cited by 42 publications

References 29 publications

Modification of TiO2 with hBN: high temperature anatase phase stabilisation and photocatalytic degradation of 1,4-dioxane

Modification of TiO2 with hBN: high temperature anatase phase stabilisation and photocatalytic degradation of 1,4-dioxane

Graphite Oxide-TiO2 Nanocomposite Type Photocatalyst for Methanol Photocatalytic Reforming Reaction

Photocatalytic Activity of Vis-Responsive Ag-Nanoparticles/TiO2 Composite Thin Films Fabricated by Molecular Precursor Method (MPM)

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Modification of TiO₂ with hBN: high temperature anatase phase stabilisation and photocatalytic degradation of 1,4-dioxane

Modification of TiO₂ with hBN: high temperature anatase phase stabilisation and photocatalytic degradation of 1,4-dioxane