Photocatalysis on silver-layer silicate/titanium dioxide composite thin films at solid/vapour interface

Ménesi, Judit; Kékesi, Renáta; Oszkó, A.; Zöllmer, Volker; Seemann, Torben; Richardt, André; Dékány, Imre

doi:10.1016/j.cattod.2009.02.030

Cited by 8 publications

(6 citation statements)

References 32 publications

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“…This increase in vis-sensitivity of the composite was not only significant, but relatively large in magnitude (Figure 8). The synergistic effect can be interpreted as the result of the excellent adsorption capabilities of the Ag NP combined with the advantageous effect of silver nanoparticles on light absorption in the visible range [28,29]. While there were general positive effects on photocatalytic activity with the increase in the amount of Ag in the composite of up to 70 mol% of Ag amount in the composite, an acute decrease of the IPCA value can be observed between 70 and 80 mol% of the Ag amount.…”

Section: Photocatalytic Activity Under Vis-light Irradiationmentioning

confidence: 99%

“…Ag NPs must be coated with a SiO 2 shell or Al 2 O 3 mask to prevent foremost their oxidation by TiO 2 [26,27]. By incorporating silver ions and Cu ions into clay minerals/TiO 2 mixtures with different ratio, it obtained composites capable of degrading ethanol in the visible wavelength range about twice as fast as the Catalysts 2013, 3 627 reference photocatalyst type P25 [28,29]. Using molecular precursor method (MPM), a coating precursor solution can be prepared by a reaction of Ti(O i Pr) 4 with ethylenediamine-N,N,N′,N'-tetraacetic acid (EDTA) under the presence of dibutylamine and hydrogen peroxide [30][31][32].…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Photocatalytic Activity Under Vis-light Irradiationmentioning

confidence: 99%

Section: Introductionmentioning

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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“…Silver nanoparticles (Ag NPs) doped on porous materials such as zeolites can be used as more robust, selective, and stable photocatalysts for UV-irradiation degradation of organics [9][10][11]. Small Ag NPs stabilized with the aid of zeolites are active sites of electrontrapping and play a significant role in the photocatalytic and photochemical reactions [11].…”

Section: Introductionmentioning

confidence: 99%

Integrating efficient filtration and visible-light photocatalysis by loading Ag-doped zeolite Y particles on filtration membrane of alumina nanofibers

Ribbens

Fan

et al. 2011

Journal of Membrane Science

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a b s t r a c tFiltration membrane technology has already been employed to remove various organic effluents produced from the textile, paper, plastic, leather, food and mineral processing industries. To improve membrane efficiency and alleviate membrane fouling, an integrated approach is adopted that combines membrane filtration and photocatalysis technology. In this study, filtration membranes of alumina nanofibers (AF) with pore size of about 10 nm (determined by the liquid-liquid displacement method) have been synthesized through an in situ hydrothermal reaction, which permitted a large flux and achieved high selectivity. Silver nanoparticles (Ag NPs) are subsequently doped on the nanofibers of the membranes. Silver nanoparticles can strongly absorb visible light due to the surface plasmon resonance (SPR) effect, and thus induce photocatalytic degradation of organic dyes, including anionic, cationic and neutral dyes, under visible light irradiation. In this integrated system, the dyes are retained on the membrane surface, their concentration in the vicinity of the Ag NPs are high and thus can be efficiently decomposed under light irradiation. Meanwhile, the usual flux deterioration caused by the accumulation of the filtered dyes in the passage pores can be avoided. For example, when an aqueous solution containing methylene blue is processed using an integrated filtration membrane, a large flux of 200 L m −2 h −1 and a stable permeating selectivity of 85% were achieved. The combined visible light photocatalysis and filtration function leads to superior performance of the integrated membranes, which have a potential to be used for the removal of organic pollutants in drinking water.

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“…11,12 Numerous studies have been carried out to develop methods for improving the photocatalytic efficiency including the noble metal modification. [12][13][14][15][16][17][18][19][20][21] Silver and gold are the most commonly used noble metal modifiers due to their stable chemistry and good electron trapping performance. 14,20,21 It has been reported that the Schottky barrier exists at the interface between the metal and the semiconductor, and the metals such as silver or gold nanoparticles can scavenge the photo-excited electrons from the surface of the semiconductor, reducing the electron-hole recombination.…”

Section: Introductionmentioning

confidence: 99%

“…[12][13][14][15][16][17][18][19][20][21] Silver and gold are the most commonly used noble metal modifiers due to their stable chemistry and good electron trapping performance. 14,20,21 It has been reported that the Schottky barrier exists at the interface between the metal and the semiconductor, and the metals such as silver or gold nanoparticles can scavenge the photo-excited electrons from the surface of the semiconductor, reducing the electron-hole recombination. [13][14][15]18,19,21 In addition, silver and gold nanoparticles exhibit extraordinary electronic properties under irradiation.…”

Section: Introductionmentioning

confidence: 99%

Selective oxidation of methanol to methyl formate on catalysts of Au–Ag alloy nanoparticles supported on titania under UV irradiation

et al. 2014

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Photocatalysis on silver-layer silicate/titanium dioxide composite thin films at solid/vapour interface

Cited by 8 publications

References 32 publications

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

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

Integrating efficient filtration and visible-light photocatalysis by loading Ag-doped zeolite Y particles on filtration membrane of alumina nanofibers

Selective oxidation of methanol to methyl formate on catalysts of Au–Ag alloy nanoparticles supported on titania under UV irradiation

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