Structural characterization of Ag-doped TiO<sub>2</sub> with enhanced photocatalytic activity

Santos, Lidiaine Maria dos; Machado, Werick Alves; França, Marcela Dias; Borges, Karen Araújo; Paniago, R.; Patrocínio, Antonio Otávio T.; Machado, Antonio E. H.

doi:10.1039/c5ra22647c

Cited by 141 publications

(74 citation statements)

References 56 publications

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“…On the other hand, a catalytic activity reduction occurs [19,20]. In order to improve the photoreaction efficiency, many authors have metals such as Ag [21], Fe [22], and Cu [23] added to it in order to prevent the process of electron/role recombination in semiconductors.…”

Section: Introductionmentioning

confidence: 99%

Experimental Design and Optimization of Triclosan and 2.8-Diclorodibenzeno-p-dioxina Degradation by the Fe/Nb2O5/UV System

et al. 2019

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This study describes the experimental design and optimization of the photocatalytic reaction using the immobilized catalyst Fe/Nb2O5 in the degradation of Triclosan and 2.8-DCDD. The techniques employed to characterize the photocatalysts were: specific surface area, average pore volume, average pore diameter, photo-acoustic spectroscopy (PAS), X-ray diffraction (XRD), and scanning electron microscopy (SEM/EDS). The reaction parameters studied were pH, catalyst concentration, catalyst calcination temperature, and nominal metallic charge. The results indicated that the immobilized Fe/Nb2O5 catalysts were efficient in the degradation of Triclosan and 2.8-dichlorodibenzene-p-dioxin. The catalysts with nominal metal loading of 1.5% Fe calcined at 873 K showed the highest constant reaction rate and the lowest half-life 0.069 min−1 and 10.04 min. Tests in different matrices indicated that the photocatalytic reaction using aqueous solution containing Cl− is faster when compared with the ultrapure water matrix.

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Section: Introductionmentioning

confidence: 99%

Experimental Design and Optimization of Triclosan and 2.8-Diclorodibenzeno-p-dioxina Degradation by the Fe/Nb2O5/UV System

et al. 2019

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“…A significant shift of the absorption peak to visible wavelengths is evident. The increased absorption and reduced bandgap energy are attributed to the interaction of the Ag nanoparticles with the TiO 2 surface, 34 which improves visible‐light harvesting. A similar effect on bandgap energy has been reported by Duan et al 35 .…”

Section: Resultsmentioning

confidence: 99%

Fabrication of Ag‐photodeposited TiO₂/cordierite honeycomb monolith photoreactors for 2‐naphthol degradation

Huynh

et al. 2020

J of Chemical Tech & Biotech

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BACKGROUND Polycyclic aromatic hydrocarbons and their derivatives have harmful effects on organisms and the environment. As a typical polycyclic aromatic hydrocarbon, 2‐naphthol is a persistent, highly toxic organic pollutant that biodegrades very slowly and thus its elimination is of high priority. RESULTS Ag‐deposited TiO2/cordierite honeycomb monoliths (CHMs) have been successfully applied to the photocatalytic degradation of 2‐naphthol. The physical properties of the catalyst were characterized using various techniques. Deposition of metallic silver on a thin layer of TiO2 adhering to the inner walls of the CHM reduces the bandgap energy and lowers the recombination rate of photogenerated electrons and holes. The optimal photocatalyst (0.4Ag‐deposited S700‐ST) exhibits a first‐order degradation rate of k = 0.048 min−1 with 91.0% decomposition of 2‐naphthol after 240 min of irradiation with 12 W, 395 nm LED light. The 0.4Ag‐deposited S700‐ST material is stable throughout four photocatalytic reaction cycles. CONCLUSIONS The work presented describes the development of a robust, stable TiO2‐coated CHM that overcomes the recovery drawbacks of nano‐TiO2‐based slurries in photocatalytic wastewater treatment. © 2020 Society of Chemical Industry

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“…These results imply that the unprotected AgNPs surface in the aggregates was low enough that the benefits from the LSPR outweighed the disadvantage from the exposed AgNP surface, acting as recombination sites for electrons. 63,64 Tripling the Ag∕nTiO 2 concentration to 0.9 wt.% also showed an improvement in the V OC , but the I SC began to fall. The higher V OC was expected and reveals that the AgNPs were indeed acting mainly via their LSPR field enhancement as light absorption boosters, generating more efficient electron-hole separation.…”

Section: Characterization Of the Blanket Design Dye-sensitized Solar mentioning

confidence: 94%

Zr-doped TiO2 as a thermostabilizer in plasmon-enhanced dye-sensitized solar cells

Pasche¹,

Grohe²,

Mittler³

et al. 2017

J. Photon. Energy

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Harvesting solar energy is a promising solution toward meeting the world's evergrowing energy demand. Dye-sensitized solar cells (DSSCs) are hybrid organic-inorganic solar cells with tremendous potential for commercial application, but they are plagued by inefficiency due to their poor sunlight absorption. Plasmonic silver nanoparticles (AgNPs) have been shown to enhance the absorptive properties of DSSCs, but their plasmonic resonance can cause thermal damage resulting in cell deterioration. Hence, the influence of Zr-doped TiO 2 on the efficiency of plasmon-enhanced DSSCs was studied, showing that 5 mol.% Zr-doping of the photoactive TiO 2 material can improve the photovoltaic performance of DSSCs by 44%. By examining three different DSSC designs, it became clear that the efficiency enhancing effect of Zr strongly depends on the proximity of the Zr-doped material to the plasmonic AgNPs.

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Structural characterization of Ag-doped TiO₂ with enhanced photocatalytic activity

Abstract: Ag-doped TiO2 nanoparticles with different metallic content (0.5, 2.0, and 5.0% m/m) were prepared using a simple and cost-effective method based on a sol–gel technique, followed by thermal treatment.

Cited by 141 publications

References 56 publications

Experimental Design and Optimization of Triclosan and 2.8-Diclorodibenzeno-p-dioxina Degradation by the Fe/Nb2O5/UV System

Experimental Design and Optimization of Triclosan and 2.8-Diclorodibenzeno-p-dioxina Degradation by the Fe/Nb2O5/UV System

Fabrication of Ag‐photodeposited TiO₂/cordierite honeycomb monolith photoreactors for 2‐naphthol degradation

Zr-doped TiO2 as a thermostabilizer in plasmon-enhanced dye-sensitized solar cells

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Structural characterization of Ag-doped TiO2 with enhanced photocatalytic activity

Abstract: Ag-doped TiO2 nanoparticles with different metallic content (0.5, 2.0, and 5.0% m/m) were prepared using a simple and cost-effective method based on a sol–gel technique, followed by thermal treatment.

Cited by 141 publications

References 56 publications

Experimental Design and Optimization of Triclosan and 2.8-Diclorodibenzeno-p-dioxina Degradation by the Fe/Nb2O5/UV System

Experimental Design and Optimization of Triclosan and 2.8-Diclorodibenzeno-p-dioxina Degradation by the Fe/Nb2O5/UV System

Fabrication of Ag‐photodeposited TiO2/cordierite honeycomb monolith photoreactors for 2‐naphthol degradation

Zr-doped TiO2 as a thermostabilizer in plasmon-enhanced dye-sensitized solar cells

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Structural characterization of Ag-doped TiO₂ with enhanced photocatalytic activity

Fabrication of Ag‐photodeposited TiO₂/cordierite honeycomb monolith photoreactors for 2‐naphthol degradation