Formation of bioactive N-doped TiO2 on Ti with visible light-induced antibacterial activity using NaOH, hot water, and subsequent ammonia atmospheric heat treatment

Kawashita, Masakazu; Endo, Naruki; Watanabe, Tomoaki; Miyazaki, Toshiki; Furuya, Maiko; Yokota, Kotoe; Abiko, Yoshihiro; Kanetaka, Hiroyasu; Takahashi, Nobuhiro

doi:10.1016/j.colsurfb.2016.05.017

Cited by 22 publications

(17 citation statements)

References 38 publications

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“…After participating in the catalytic reaction, the Pd 0 percentage decreased, suggesting the oxidation of Pd 0 to Pd 2+ . Additionally, all of the spent catalysts exhibited a Na KLL peak appearing at a binding energy of approximately 496 eV (kinetic energy = 990.7 eV), which can be ascribed to the NaO bond . The presence of the Na KLL signal is due to the addition of NaOH in the reaction process …”

Section: Resultsmentioning

confidence: 99%

Glycerol valorization to lactic acid catalyzed by hydroxyapatite‐supported palladium particles

Shen

Zhang

et al. 2018

J of Chemical Tech & Biotech

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BACKGROUND Catalytic formation of lactic acid from biomass glycerol is a sustainable alternative to the conventional fermentation process starting from carbohydrate and the chemical route using HCN and acetaldehyde. Highly concentrated glycerol can be effectively converted to lactic acid using hydroxyapatite‐supported palladium particles in the presence of NaOH. RESULTS The 3% hydroxyapatite‐supported palladium catalyst (Pd3/HAP) demonstrates excellent activity (TOF = 1274 h−1 for a batch time of 90 min) with a high selectivity (95%) towards lactic acid at 99% glycerol conversion (230 °C, NaOH:glycerol molar ratio = 1.1, and glycerol/total Pd intake = 1926). Under the same reaction conditions, the selectivities of lactic acid were 82% and 90% on Pd0.75/HAP and Pd1.5/HAP catalysts, respectively. The Pd3/HAP catalyst was recycled five times in a batch set‐up without a significant drop in activity and lactic acid selectivity, which is indicative of good catalyst stability. CONCLUSIONS Pd‐based catalysts on available hydroxyapatite supports are efficient catalysts for glycerol selective oxidation. The catalysts possess active PdO and Pd0 species well dispersed on the functionalized hydroxyapatite support. Pd0 nanoparticles and NaOH synergistically catalyze the reaction process. © 2018 Society of Chemical Industry

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Section: Resultsmentioning

confidence: 99%

Glycerol valorization to lactic acid catalyzed by hydroxyapatite‐supported palladium particles

Shen

Zhang

et al. 2018

J of Chemical Tech & Biotech

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“…Coating dental implants with photocatalytically active TiO 2 is one approach to making dental implants antibacterially active . Visible‐light‐active TiO 2 coatings can be used for long periods in the treatment of peri‐implantitis without having harmful effects on surrounding tissues because such coatings can kill adhered bacteria when and where the implants are exposed to visible light in the mouth.…”

Section: Introductionmentioning

confidence: 99%

“…Au contributes to visible‐light activation of TiO 2 photocatalysis, both when dissolved as ions and when dispersed as metallic nanoparticles in TiO 2 . Therefore, visible‐light‐responsive antibacterial activity of Ti alloys can be produced by the formation of Au‐incorporated TiO 2 layers through air oxidation, which is simpler than two‐step thermal oxidation or a three‐step process …”

Section: Introductionmentioning

confidence: 99%

“…3 Coating dental implants with photocatalytically active TiO 2 is one approach to making dental implants antibacterially active. 4 Visible-light-active TiO 2 coatings can be used for long periods in the treatment of peri-implantitis without having harmful effects on surrounding tissues because such coatings can kill adhered bacteria when and where the implants are exposed to visible light in the mouth. Furthermore, coatings of TiO 2 on Ti dental implants are reported to improve the bone compatibility of implants, 5 and their photocatalytic activity is thought to promote re-osseointegration, 6 which is needed to achieve a good prognosis for peri-implantitis.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, visible-light-responsive antibacterial activity of Ti alloys can be produced by the formation of Au-incorporated TiO 2 layers through air oxidation, which is simpler than two-step thermal oxidation 9 or a three-step process. 4 In this study, TiO 2 layers were formed on Ti-Au alloys by air oxidation, the Au introduced into the layers was characterized, and tests for stearic acid degradation, antibacterial activity against Escherichia coli (E. coli), and radical formation under visible-light irradiation were conducted.…”

Section: Introductionmentioning

confidence: 99%

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Visible‐light‐responsive antibacterial activity of Au‐incorporated TiO₂ layers formed on Ti–(0–10)at%Au alloys by air oxidation

Ueda

Ito

et al. 2019

J Biomedical Materials Res

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Rutile TiO2 layers were formed on substrates of Ti–(0–10)at%Au alloys by a simple process of air oxidation, and their antibacterial activities were evaluated under visible‐light irradiation (λ ≥ 400 nm). Au was introduced into the TiO2 layers on Ti–(1–10)at%Au alloys and existed as both metallic Au nanoparticles and dissolved Au3+ ions. The TiO2 layers that formed on Ti–5at%Au and Ti–10at%Au alloys exhibited visible‐light photocatalytic activity, that is, degradation of stearic acid and antibacterial activity against Escherichia coli. These visible‐light activities were attributed to the surface plasmon resonance of metallic Au nanoparticles and the decrease in bandgap energy caused by dissolved Au3+ ions. The formation of hydroxyl radicals observed under visible‐light irradiation is attributable to antibacterial activity. From a cost perspective, a Ti–5at%Au alloy is more suitable as a substrate for the formation of a TiO2 layer with antibacterial properties than a Ti–10at%Au alloy. © 2019 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 107A: 991–1000, 2019.

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NIR‐Responsive TiO₂ Biometasurfaces: Toward In Situ Photodynamic Antibacterial Therapy for Biomedical Implants

et al. 2021

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Implant‐related microbial infection is a challenging clinical problem, and its treatment requires efficient eradication of the biofilm from the implant surface. Near‐infrared (NIR)‐responsive strategies are proposed as an emerging efficient antibacterial therapy. However, the utilization of photosensitizers or photocatalytic/photothermal nanomaterials in the available approach likely induces high potential risks of interfacial deterioration and biosafety compromise. Herein, a TiO2/TiO2−x metasurface with potent NIR‐responsive antibacterial activity is produced on a Ti alloy implant by a newly invented topochemical conversion‐based alkaline–acid bidirectional hydrothermal method (aaBH). Electromagnetic simulations prove that NIR absorption and near‐field distribution of the metasurface can be tuned by the dimension and arrangement of the nanostructural unit. Promising antibacterial efficacy is proved by both in vitro and in vivo tests, with low‐power NIR irradiation for 10 min. Besides, the designed nanostructure in the metasurface itself also shows excellence in enhancing the adhesion‐related gene expression of human gingival fibroblasts that are exposed to 10 min of NIR irradiation, proving the potent nanostructure‐induced biological effects. This work provides a biosafe and upscalable metasurfacing approach with extraordinary capacity of manipulating light adsorption, photocatalysis, and biological properties.

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Formation of bioactive N-doped TiO2 on Ti with visible light-induced antibacterial activity using NaOH, hot water, and subsequent ammonia atmospheric heat treatment

Cited by 22 publications

References 38 publications

Glycerol valorization to lactic acid catalyzed by hydroxyapatite‐supported palladium particles

Glycerol valorization to lactic acid catalyzed by hydroxyapatite‐supported palladium particles

Visible‐light‐responsive antibacterial activity of Au‐incorporated TiO₂ layers formed on Ti–(0–10)at%Au alloys by air oxidation

NIR‐Responsive TiO₂ Biometasurfaces: Toward In Situ Photodynamic Antibacterial Therapy for Biomedical Implants

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Formation of bioactive N-doped TiO2 on Ti with visible light-induced antibacterial activity using NaOH, hot water, and subsequent ammonia atmospheric heat treatment

Cited by 22 publications

References 38 publications

Glycerol valorization to lactic acid catalyzed by hydroxyapatite‐supported palladium particles

Glycerol valorization to lactic acid catalyzed by hydroxyapatite‐supported palladium particles

Visible‐light‐responsive antibacterial activity of Au‐incorporated TiO2 layers formed on Ti–(0–10)at%Au alloys by air oxidation

NIR‐Responsive TiO2 Biometasurfaces: Toward In Situ Photodynamic Antibacterial Therapy for Biomedical Implants

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Product

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Visible‐light‐responsive antibacterial activity of Au‐incorporated TiO₂ layers formed on Ti–(0–10)at%Au alloys by air oxidation

NIR‐Responsive TiO₂ Biometasurfaces: Toward In Situ Photodynamic Antibacterial Therapy for Biomedical Implants