A facile dopamine-assisted method for the preparation of antibacterial surfaces based on Ag/TiO2 nanoparticles

Zeng, Liang; Zhou, Hui; Liao, Jin Jin; Yang, Ye; Wang, Kai; Li, Ming; He, Ning; Chen, Xiao; Song, Rui; Cai, Wenfang; Liu, Hong; Wu, Xuee

doi:10.1016/j.apsusc.2019.03.174

Cited by 25 publications

(5 citation statements)

References 41 publications

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“…For many decades, titanium dioxide (TiO 2 ) has shown great and considerable potential in removing organic contaminants and bacteria from sewage, owing to its interesting properties in terms of photoactivity, stability, availability, and low-cost (Yu et al 2001;Lachheb et al 2002;Abdellah et al 2018;Canbaz et al 2019;Lu et al 2019). The photodegradation of different pollutants, as well as the microorganism inactivation, held as follows, the absorption of a photon by the TiO 2 semiconductor (hυ ≥ Eg) provokes electron excitation from the valence band to the conduction one, creating, therefore, positively charged holes (h + ).…”

Section: Introductionmentioning

confidence: 99%

Recent progress on Ag/TiO2 photocatalysts: photocatalytic and bactericidal behaviors

Chakhtouna

Benzeid

Zari

et al. 2021

Environ Sci Pollut Res

249

111

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For many decades, titanium dioxide (TiO 2 ) semiconductor has been extensively applied in several environmental applications due to its higher photocatalytic performances toward different organic pollutants, pharmaceutical compounds, and bacteria. However, its shortfall response to visible light, and the expeditious recombination rate of the photogenerated electron-hole pairs, hampers its utilization. Doping TiO 2 semiconductor with silver nanoparticles is a sound strategy to (1) extend its photocatalytic activity to visible light, (2) prevent the electron/holes pairs recombination due to the formation of the Schottky barrier at the interfaces with TiO 2 that act as an electron-trapping center, and (3) enhance its bactericide performances. This review focuses on the recent progress on silver-doped titanium dioxide (Ag/TiO 2 )-based photocatalysts. It addresses a wide range of Ag/TiO 2 synthesis techniques, their physicochemical properties and discusses thoroughly the important role of silver (Ag) nanoparticles in enhancing the removal capacity and antibacterial performances of the Ag/TiO 2 photocatalysts.

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Section: Introductionmentioning

confidence: 99%

Recent progress on Ag/TiO2 photocatalysts: photocatalytic and bactericidal behaviors

Chakhtouna

Benzeid

Zari

et al. 2021

Environ Sci Pollut Res

249

111

View full text Add to dashboard Cite

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“…Several existing studies have demonstrated that an thin amorphous TiO 2 nanolayer can not only increase the specific surface area to enhance light harvesting but also improves the separation of photogenerated electrons and holes, thereby improving the photocatalytic activity [29][30][31]. Wu et al fabricated Ag/TiO 2 nanoparticles through dopamine-assisted process, which exhibited high activity for Escherichia coli (E. coli) and Bacillus subtilis bacteria under visible light [32]. The decrease in the thickness of the coating accelerates the transformation of photo-generated carriers.…”

Section: Introductionmentioning

confidence: 99%

Antibacterial properties of Ag/TiO2/PDA nanofilm on anodized 316L stainless steel substrate under illumination by a normal flashlight

Liu

et al. 2020

J Mater Sci

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The demand of medical materials for rapid and efficient elimination of bacteria has seen a dramatic surge over the past few years. In this study, antibacterial nanofilms with reactive oxygen species were generated by photocatalysis. To prepare these nanofilms, Ag and amorphous TiO 2 nanoparticles decorated on polydopamine (PDA) were coated on three-dimensional (3D) nanopore arrays, which was fabricated on a substrate of anodized stainless steel. All the antibacterial tests were conducted with a household flashlight, which may be considered as a practical approach for antibacterial materials. The photoelectrochemical property of the 3D Ag/TiO 2 /PDA nanofilm on 316L stainless steel (Ag/TiO 2 /PDA SS) was about 15 times higher than that of the annealed Ag/ TiO 2 /PDA SS, and consequently, it exhibited higher antibacterial activity. The enhanced photoelectrochemical property is attributed to the successful separation of electrons (amorphous TiO 2 ) and holes (Ag nanoparticles). Further, when a plate containing 3D Ag/TiO 2 /PDA SS was irradiated with visible light just for 10 min, it immediately destroyed the bacteria in 10 6 CFU/mL without any bacterial colony. After five weeks, there were still no bacterial colonies in the plate corresponding to Ag/TiO 2 /PDA SS under visible light, while Ag/TiO 2 / PDA SS in dark had a negligible effect on the bacteria, i.e., the antibacterial mechanism through direct contact and ion dissolution was not efficient. The excellent antibacterial properties of 3D Ag/TiO 2 /PDA SS illuminated by flashlight provides an efficient, facile, and cost-effective technique for the development of antibacterial medical materials to meet the increasing demand of eliminating bacterial infections.

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“…In the full XPS spectrum of Ag/TiO 2 (Figure a), the signal peaks were assigned to the elements O, Ti, C, and Ag, indicating the successful loading of Ag on the TiO 2 surface. The high-resolution XPS spectrum of the Ag/TiO 2 sample Ag 3d is shown in Figure b, with two distinct peaks at 367.6 and 373.7 eV associated with the characteristic orbital splitting of Ag 3d 5/2 and Ag 3d 3/2 , respectively, with a spin energy gap of 6 eV, which is characteristic of Ag 0 . , The peak levels of Ag 3d were significantly lower than those of bulk metallic Ag (368.3 eV for Ag 3d 5/2 and 374.3 eV for Ag 3d 3/2 ), this result confirms that UV radiation reduces Ag + to metallic Ag nanoclusters. In Figure c, the two main peaks at 458.7 and 464.5 eV belong to Ti 2p 3/2 and Ti 2p 1/2 , respectively, indicating the presence of Ti in the form of Ti 4+ .…”

Section: Resultsmentioning

confidence: 99%

Confined Synthesis of Noble Metal Clusters Assisted by Liquid Film for Photocatalytic CO₂ Reduction

Gong,

Wu,

Jiang

et al. 2024

Langmuir

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The important concept of confined synthesis is considered a promising strategy for the design and synthesis of definable nanostructured materials with controllable compositions and specific morphology, such as highly loaded single-atom catalysts capable of providing abundant active sites for photocatalytic reactions. In recent years, researchers have been working on developing new confined reaction systems and searching for new confined spaces. Here, we present for the first time the concept of a bubble liquid film as a novel confined space. The liquid film has a typical sandwich structure consisting of a water layer, sandwiched between the upper and lower surfactant layers, with the thickness of the intermediate water layer at the micro-and nanometer scales, which can serve as a good confinement. Based on the above understanding and combined with the photodeposition method, we successfully confined synthesized Ag/TiO 2 , Au/TiO 2 , and Pd/TiO 2 photocatalysts in liquid film. By HAADF-STEM, it can be seen that the noble metal morphologies are all nanoclusters of about 1 nm and are highly uniformly dispersed on the TiO 2 surface. Compared with photodeposition in solution, we believe that the surfactant molecular layer restricts a limited amount of precursor to the liquid film, avoiding the accumulation of noble metals and the formation of large particle size nanoparticles. The liquid film, meanwhile, restricts the migration path of noble metal precursors, allowing for thorough in situ photodeposition and enables the complete and uniform dispersion of noble metal precursors, greatly reducing the photodeposition time. The uniform loading of the three noble metals proved the universality of the method, and the catalysts showed high activity for photocatalytic CO 2 reduction. The rates of reduction of CO 2 to CO over the Ag/TiO 2 photocatalytic reached 230 μmol g −1 h −1 .This study provides a new idea for the expansion of the confined reaction system and a reference for the study of liquid film as the confined space.

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A facile dopamine-assisted method for the preparation of antibacterial surfaces based on Ag/TiO2 nanoparticles

Cited by 25 publications

References 41 publications

Recent progress on Ag/TiO2 photocatalysts: photocatalytic and bactericidal behaviors

Recent progress on Ag/TiO2 photocatalysts: photocatalytic and bactericidal behaviors

Antibacterial properties of Ag/TiO2/PDA nanofilm on anodized 316L stainless steel substrate under illumination by a normal flashlight

Confined Synthesis of Noble Metal Clusters Assisted by Liquid Film for Photocatalytic CO₂ Reduction

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A facile dopamine-assisted method for the preparation of antibacterial surfaces based on Ag/TiO2 nanoparticles

Cited by 25 publications

References 41 publications

Recent progress on Ag/TiO2 photocatalysts: photocatalytic and bactericidal behaviors

Recent progress on Ag/TiO2 photocatalysts: photocatalytic and bactericidal behaviors

Antibacterial properties of Ag/TiO2/PDA nanofilm on anodized 316L stainless steel substrate under illumination by a normal flashlight

Confined Synthesis of Noble Metal Clusters Assisted by Liquid Film for Photocatalytic CO2 Reduction

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Confined Synthesis of Noble Metal Clusters Assisted by Liquid Film for Photocatalytic CO₂ Reduction