Nanoclusters of silver doped in zeolites as photocatalysts

Patterson, Howard H.; Gomez, Robert S.; Lu, Haiyan; Yson, Renante L.

doi:10.1016/j.cattod.2006.07.057

Cited by 42 publications

(21 citation statements)

References 46 publications

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“…These include increasing the surface area of TiO 2 , the generation of defect structures to induce space-charge separation, and the modification of TiO 2 with metal(s) or other semiconductor(s) [3,[6][7][8][9]. Another method that could increase the photocatalytic efficiency of TiO 2 is to add a co-sorbent such as silica, alumina, zeolites or clay, but observations do not support this suggestion [10][11][12][13]. Accordingly, the development of new materials for modifying TiO 2 is urgently required to increase the photocatalytic activity of TiO 2 for treating organic pollutants.…”

Section: Introductionmentioning

confidence: 95%

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Prevenient dye-degradation mechanisms using UV/TiO2/carbon nanotubes process

Kuo¹

2009

Journal of Hazardous Materials

134

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Section: Introductionmentioning

confidence: 95%

“…Various methods have been reported to increase photocatalytic efficiency [3,[6][7][8][9][10][11][12][13]. These include increasing the surface area of TiO 2 , the generation of defect structures to induce space-charge separation, and the modification of TiO 2 with metal(s) or other semiconductor(s) [3,[6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Prevenient dye-degradation mechanisms using UV/TiO2/carbon nanotubes process

Kuo¹

2009

Journal of Hazardous Materials

134

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“…The presence of two different excitation maxima at approximately 268 and 298 nm for the catalysts containing Ag(I) suggests that the metal clusters within those catalysts are of two different sizes. On the basis of previous research on the excitation spectra of zeolite-based metal nanoclusters [32,33], UV light at 268 nm is likely to excite nanoclusters that are silver dimers and UV light at 298 nm is likely to excite silver trimers of various geometries. Both Ag-Y and Ag/Fe-Y exhibit this phenomenon, but comparisons of the two show slight differences.…”

Section: Resultsmentioning

confidence: 99%

Zeolite-supported silver and silver–iron nanoclusters and their activities as photodecomposition catalysts

Gomez

Yson

et al. 2011

Res Chem Intermed

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Catalysts containing nanoclusters of Ag(I) and Fe 2 O 3 as dopants with sodalite and Y zeolite supports have been investigated in order to develop a more efficient catalyst for photodecomposition of the pesticide carbaryl and to gain insight about the reaction mechanism. Ag(I)-sodalite, Ag(I)/Fe 2 O 3 -sodalite, Ag(I)-Y zeolite, and Ag(I)/Fe 2 O 3 -Y zeolite were synthesized by ion-exchange techniques and characterized by powder X-ray diffraction (XRD), solid-state luminescence, UV-visible absorption, and atomic absorption spectroscopy measurements. The luminescence activity of the sodalite-supported and Y zeolite-supported catalysts was significantly different. Catalyst performance studies were conducted using carbaryl as the target compound and specific wavelengths of UV light as photon sources for the experiments. The studies showed that each catalyst's performance was determined primarily by the specific wavelength of the UV light with which the system was irradiated. The studies also showed that inclusion of Fe 2 O 3 as dopant enhanced the reactivity of the catalysts in several instances, with the Ag(I)/Fe 2 O 3 -sodalite catalyst and 298 nm irradiation being the most reactive of the systems studied. Additional reactions using each catalyst and 298 nm irradiation, and including either sodium bicarbonate as hydroxyl radical scavenger or D 2 O as solvent, showed that hydroxyl radicals were likely intermediates in the catalyzed photodecomposition reaction.

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“…The incorporation of transition metals with different oxidation states into zeolites has been studied to develop materials with potential applications in many fields, as catalysis and water treatment [5,6].…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic performance of Ag-modified natural zeolite catalyst for photocatalysis degradation of Methylene Blue (MB) under VIS irradiation

et al. 2012

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In this study, Ag-modified natural zeolite catalyst (Z-Ag red ) was synthesized by chemical activation prior to the ion exchange and followed by a silver reduction with sodium boron hydride. The surface characterization of Z-Ag red has been investigated by X-ray diffraction, FT-IR spectroscopy, SEM microscopy and EDX analysis. Also, UV-VIS diffuse reflectance (DRUV-VIS) spectroscopy was used to determine the light absorption properties of the catalyst. The effect of silver reduction was noticed by comparison with the characterization of silvermodified natural zeolite by ion-exchange without the reduction stage. The photocatalytic performance of Z-Ag red catalyst was proved by photocatalysis application for the decolorisation and degradation of Methylene Blue (MB) dye containing wastewater under visible irradiation. The optimum operating parameters were determined based on the assessment of the photocatalytic process efficiency as a function of the catalyst dose, the initial pH, and the initial concentration of dye. The good results regarding the photocatalytic degradation of MB dye using Z-Ag red catalyst claim it as a potential for the real photocatalysis application in MB-containing wastewater under solar light.

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Nanoclusters of silver doped in zeolites as photocatalysts

Cited by 42 publications

References 46 publications

Prevenient dye-degradation mechanisms using UV/TiO2/carbon nanotubes process

Prevenient dye-degradation mechanisms using UV/TiO2/carbon nanotubes process

Zeolite-supported silver and silver–iron nanoclusters and their activities as photodecomposition catalysts

Photocatalytic performance of Ag-modified natural zeolite catalyst for photocatalysis degradation of Methylene Blue (MB) under VIS irradiation

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