Fabrication of visible-light-driven Ag/TiO2 heterojunction composites induced by shock wave

Xu, Chunjian; Chen, Pengwan; Liu, Jianjun; Yin, Hao; Gao, Xin; Mei, Xiaofeng

doi:10.1016/j.jallcom.2016.04.048

Cited by 29 publications

(5 citation statements)

References 37 publications

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“…Recently, the hybridization of noble metals (Au, Ag, Pd) and semiconducting oxides has become the most promising strategy to defeat the large band gap of semiconducting oxides [40][41][42][43][44]. The energy level alignment is combined by the heterojunction at the nanoscale in these nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Antibacterial Activity of TiO2- and ZnO-Decorated with Silver Nanoparticles

Nguyen¹,

Vu²,

Nguyen³

et al. 2019

J. Compos. Sci.

105

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This work emphasizes the use of the silver decorative method to enhance the antibacterial activity of TiO2 and ZnO nanoparticles. These silver-decorated nanoparticles (hybrid nanoparticles) were synthesized using sodium borohydride as a reducing agent, with the weight ratio of Ag precursors/oxide nanoparticles = 1:30. The morphology and optical properties of these hybrid nanoparticles were investigated using transmission electron microscopy (TEM), X-ray diffraction (XRD) patterns, and UV-Vis spectroscopy. The agar-well diffusion method was used to evaluate their antibacterial activity against both Staphylococcus aureus and Escherichia coli bacteria, with or without light irradiation. The TEM images indicated clearly that silver nanoparticles (AgNPs, 5–10 nm) were well deposited on the surface of nano-TiO2 particles (30–60 nm). In addition to this, bigger AgNPs (<20 nm) were dispersed on the surface of nano-ZnO particles (30–50 nm). XRD patterns confirmed the presence of AgNPs in both Ag-decorated TiO2 and Ag-decorated ZnO nanoparticles. UV-Vis spectra confirmed that the hybridization of Ag and oxide nanoparticles led to a shift in the absorption edge of oxide nanoparticles to the lower energy region (visible region). The antibacterial tests indicated that both oxide pure nanoparticles did not exhibit inhibitory effects against bacteria, with or without light irradiation. However, the presence of AgNPs in their hybrids, even at low content (<40 mg/mL), leads to a good antibacterial activity, and higher inhibition zones under light irradiation as compared to those in dark were observed.

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Section: Introductionmentioning

confidence: 99%

Antibacterial Activity of TiO2- and ZnO-Decorated with Silver Nanoparticles

Nguyen¹,

Vu²,

Nguyen³

et al. 2019

J. Compos. Sci.

105

View full text Add to dashboard Cite

show abstract

“…S1) to an anatase with only a low percentage of rutile. This suggests that the sintered TiO 2 NPs will show better photocatalytic activity than TiO 2 rutile phase as described in previous section, as anatase crystal structure has higher surface area and oxygen vacancies to interact with oxygen molecules to generate reactive species and degrade more efficiently the organic pollutant [32]. In addition, as shown in Fig.…”

Section: Characterizationmentioning

confidence: 56%

“…Additionally, there is considerable interest in utilizing AgNPs to enhance the photocatalytic properties, because of its high oxygen adsorption reactivity [28], high efficiency and capacity to facilitate the excitation of electrons by creating a local electric field [29][30][31], and as a consequence improving the semiconductor photo-response. Chen and co-workers [32] recently Submitted to Journal of Physics and Chemistry of Solids reported that some issues still occur in these kind of semiconductor-metal photocatalysts, such as a weak junction, easy separation and self-agglomerate, impacting in a less separation of photo-generated electron-hole pairs. In this respect, the development of Ag-TiO 2 compounds with better junctions is also a great challenge to efficiently separate the generated electron-hole pairs, thus increasing the photoresponse.…”

Section: Introductionmentioning

confidence: 99%

Controlled Ag-TiO 2 heterojunction obtained by combining physical vapor deposition and bifunctional surface modifiers

Barrientos

Allende

Laguna‐Bercero

et al. 2018

Journal of Physics and Chemistry of Solids

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A controlled physical method without any solvent was developed to growth Ag nanoparticles on TiO 2 through using mercaptoacetic acid as bifunctional surface modifier. The fabricated Ag-TiO 2 particles were proposed as an innovative photocatalytic material. The particle size, chemical nature, morphology and chemical bonding between the mercaptoacetic acid, silver and titania have been characterized by UV-vis Absorption Spectroscopy, Powder X-Ray Diffraction, Raman Spectroscopy, Transmission Electron Microscopy and Field Emission Scanning Electron Microscopy. Combining the photocatalytic activity of titania with the excellent electron acceptor abilities and visible absorption of small spherical silver nanoparticles, it was possible to demonstrate an efficient photo-induced degradation of cationic organic pollutant under UV-Vis light. The nanocatalyst material obtained at 30s of sputtered time under simulated sunlight provides almost complete degradation (97%) of methylene blue after 120 min. The particle-size and distribution of silver nanoparticles have been achieved for the first time by a physical method using controlled chemical bonding to bifunctional surface modifiers and the sputter deposition time.

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“…As a N-type semiconductor, titanium dioxide (TiO 2 ) has garnered significant attention due to its low cost, easy commercial availability, nontoxicity, high thermal and photochemical stability, and unique optical properties [ 18 , 19 ]. TiO 2 exists in various nanoscale forms, including nanospheres [ 20 ], nanowires [ 21 , 22 ], nanotubes [ 23 ], nanofibers [ 24 ], and has found wide-ranging applications in pollutant degradation [ 25 , 26 ], hydrogen production [ 27 , 28 ], and carbon dioxide reduction [ 29 ], etc. However, the large band gap width of TiO 2 (3.0–3.2 eV) restricts its light absorption to the UV region and limits its use in visible light irradiation [ 13 , 30 ].…”

Section: Introductionmentioning

confidence: 99%

Gamma Radiation Synthesis of Ag/P25 Nanocomposites for Efficient Photocatalytic Degradation of Organic Contaminant

Zeng

Que

et al. 2023

Nanomaterials

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Titanium dioxide (TiO2) has garnered significant attention among various photocatalysts, whereas its photocatalytic activity is limited by its wide bandgap and inefficient charge separation, making the exploration of new strategies to improve its photocatalytic performance increasingly important. Here, we report the synthesis of Ag/P25 nanocomposites through a one-step gamma-ray radiation method using AgNO3 and commercial TiO2 (Degussa P25). The resulting products were characterized by powder X-ray diffraction, UV-Vis diffused reflectance spectroscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy. The effect of free radical scavengers, feed ratios of Ag/P25, and dose rates on the photocatalytic activity of the Ag/P25 nanocomposites were systematically investigated using rhodamine B under Xenon light irradiation. The results showed that the Ag/P25 photocatalyst synthesized with a feed ratio of 2.5 wt% and isopropyl alcohol as the free radical scavenger at a dose rate of 130 Gy/min exhibited outstanding photocatalytic activity, with a reaction rate constant of 0.0674 min−1, much higher than that of P25. Additionally, we found that the particle size of Ag could be effectively controlled by changing the dose rate, and the Ag/P25 nanocomposites doped with smaller size of Ag nanoparticles performed higher photocatalytic activities. The synthesis strategy presented in this study offers new insight into the future development of highly efficient photocatalysts using radiation techniques.

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Fabrication of visible-light-driven Ag/TiO2 heterojunction composites induced by shock wave

Cited by 29 publications

References 37 publications

Antibacterial Activity of TiO2- and ZnO-Decorated with Silver Nanoparticles

Antibacterial Activity of TiO2- and ZnO-Decorated with Silver Nanoparticles

Controlled Ag-TiO 2 heterojunction obtained by combining physical vapor deposition and bifunctional surface modifiers

Gamma Radiation Synthesis of Ag/P25 Nanocomposites for Efficient Photocatalytic Degradation of Organic Contaminant

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