Size-dependence of plasmonic Au nanoparticles in photocatalytic behavior of Au/TiO 2 and Au@SiO 2 /TiO 2

Yoo, Seon Mi; Rawal, Sher Bahadur; Lee, Ji Eun; Kim, Jeongho; Ryu, Han-Youl; Park, Dong-Wha; Lee, Wan In

doi:10.1016/j.apcata.2015.04.003

Cited by 66 publications

(41 citation statements)

References 58 publications

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“…Overall, the effects of LSPR would be advantageous for photocatalytic reactions, but may play different roles, depending on the specific photocatalytic reaction. For example, in the photocatalytic oxidation reactions of aqueous salicylic acid in our previous work, the Au/TiO 2 exhibited significantly higher catalytic activity than the bare TiO 2 under the irradiation of Light-II or UV-visible light [61]. In those reactions, the enhancement of the photocatalytic activity is considered to be due to the charge separation by the loaded Au NPs as well as the enhancement of the localized electric field by the LSPR effect.…”

Section: Resultsmentioning

confidence: 98%

Size-dependent plasmonic effects of Au and Au@SiO 2 nanoparticles in photocatalytic CO 2 conversion reaction of Pt/TiO 2

Bera

Lee

Rawal

et al. 2016

Applied Catalysis B: Environmental

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Section: Resultsmentioning

confidence: 98%

Size-dependent plasmonic effects of Au and Au@SiO 2 nanoparticles in photocatalytic CO 2 conversion reaction of Pt/TiO 2

Bera

Lee

Rawal

et al. 2016

Applied Catalysis B: Environmental

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“…AgNPs can act as electron receivers and catalytic redox sites in an Ag-doped micro-TiO 2 system. Photo-excited electrons of micro-TiO 2 are likely transferred from the conduction band of TiO 2 to AgNPs because the Fermi levels of Ag are lower than that of TiO 2 , while the lifetime of oxidative positive holes became longer [22]. This mechanism leads to inhibition of the recombination of electron/hole charges, which in turn enhance the photocatalytic activity.…”

Section: Photocatalyst Characterizationmentioning

confidence: 99%

Digitally Printed AgNPs Doped TiO2 on Commercial Porcelain-Grès Tiles: Synergistic Effects and Continuous Photocatalytic Antibacterial Activity

et al. 2020

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In the present study, we use commercial digitally printed ceramic tiles, functionnalized by AgNPs doped micro–TiO2, to investigate the mechanism of Ag in the continouos photocatalytic antibacterial activity. The novelty of the research lies in the attempt to understand the mechanism of Ag, supported on TiO2, able to exhibit the same antibacterial activity of a standard system containing Ag species, but here, totally embedded on the tile surface, and thus not free to move and damage the bacteria cell. UV/vis diffuse reflectance spectroscopy (DRS) of AgNPs–TiO2 tiles indicated an enhanced visible light response, wherein a new absorption band was produced around 18,000–20,000 cm−1 (i.e., in the 400–600 nm range) owing to the surface plasmon resonance (SPR) of AgNPs. The antibacterial photocatalytic experiments were conducted towards the inactivation of E. coli under solar light and indoor light. It was found that the degradation speed of E. coli in the presence of AgNPs–TiO2 tiles is solar light-intensity depending. This justifies the semiconductor behavior of the material. Furthermore, the AgNPs–TiO2 tiles exhibit a high ability for the inactivation of E. coli at a high load (104–107 colony-forming unit (CFU)/mL). Additionally, AgNPs–TiO2 tiles showed a remarkable antibacterial activity under indoor light, which confirms the good photocatalytic ability of such tiles. On the basis of the reactive oxygen species (ROS) quenching experiments, O2•− species and h+ were more reactive for the inactivation of E. coli rather than •OH species. This is because of the different lifetime (bacteria are more likely oxidized by ROS with longer lifetime); in fact, O2•− and h+ exhibit a longer lifetime compared with •OH species. The generation of H2O2 as the most stable ROS molecule was also suggested.

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“…The specific surface area of SiO 2 @TiO 2 crystallite photocatalysts significantly increases with the increase of SiO 2 fraction because the hydrothermally produced amorphous SiO 2 possesses a high surface area. It is interesting to note that the pore volume and pore size increase, reach a maximum value at 30%SiO 2 further increase of SiO 2 fraction. The enlarged specific surface area, pore volume and pore size, indicating a looser SiO 2 /TiO 2 shell on the surface of TiO 2 crystalline particles, are resulted from a reciprocal inhibition effect in volume shrinkage of TBOT complex-and TEOS-derived gel networks.…”

Section: Resultsmentioning

confidence: 99%

“…Semiconductor TiO 2 has been extensively studied as photocatalyst for the degradation of organic pollutant in water or air due to its chemical and physical stability, superior photocatalytic oxidation ability, easy availability, low cost and nontoxicity [1][2][3]. The mechanism of TiO 2 -based photocatalytic reaction [4,5] can be described as follows: Electrons in the valence band of TiO 2 absorb photon energy and get excited to the conduction band with the formation of positive holes in the valence band.…”

Section: Introductionmentioning

confidence: 99%

Facile synthesis of SiO2@TiO2 crystallite photocatalysts with enhanced interaction level and high light absorption efficiency

Dong

Jin

et al. 2017

Nanotechnol. Environ. Eng.

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SiO 2 @TiO 2 crystallite photocatalysts with TiO 2 crystallite core and porous amorphous SiO 2 /TiO 2 shell were synthesized as photocatalyst by one-pot hydrothermal process using tetrabutyl titanate (TBOT) complex and ethyl orthosilicate (TEOS) as Ti and Si sources, respectively. The synthesized SiO 2 @TiO 2 crystallite photocatalysts were characterized by transmission electron microscopy, X-ray diffraction pattern, UV-Vis diffuse reflectance spectrum and N 2 adsorption-desorption isotherm. The interaction between TiO 2 and SiO 2 , which is associated with photocatalytically active centers, is significantly improved through an enlargement in the interfacial area and the optimization of SiO 2 fraction. The SiO 2 modification does not lower the light absorption efficiency of TiO 2 crystallite core owning to the low reflectivity of porous SiO 2 /TiO 2 shell but endows the photocatalyst with easy separation behavior from aqueous solution. Furthermore, the reciprocal inhibition in volume shrinkage of TBOT complex-and TEOS-derived gel networks, as a consequence of mineralization asynchronism, increases the specific surface area and pore volume of the formed SiO 2 / TiO 2 shell. The enhanced photocatalytic activity of SiO 2 @TiO 2 crystallite photocatalysts by SiO 2 modification is mainly ascribed to an increase in the interaction level, the high light absorption efficiency of SiO 2 @TiO 2 crystallite photocatalysts and an enlargement in specific surface area of SiO 2 /TiO 2 shell.

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Size-dependence of plasmonic Au nanoparticles in photocatalytic behavior of Au/TiO 2 and Au@SiO 2 /TiO 2

Cited by 66 publications

References 58 publications

Size-dependent plasmonic effects of Au and Au@SiO 2 nanoparticles in photocatalytic CO 2 conversion reaction of Pt/TiO 2

Size-dependent plasmonic effects of Au and Au@SiO 2 nanoparticles in photocatalytic CO 2 conversion reaction of Pt/TiO 2

Digitally Printed AgNPs Doped TiO2 on Commercial Porcelain-Grès Tiles: Synergistic Effects and Continuous Photocatalytic Antibacterial Activity

Facile synthesis of SiO2@TiO2 crystallite photocatalysts with enhanced interaction level and high light absorption efficiency

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