Fabrication of a visible-light-responsive photocatalytic antibacterial coating on titanium through anodic oxidation in a nitrate/ethylene glycol electrolyte

Ohtsu, Naofumi; Yokoi, Kento; Saito, Aki

doi:10.1016/j.surfcoat.2014.12.021

Cited by 17 publications

(12 citation statements)

References 31 publications

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“…It is worth mentioning that since the early discovery of the self-cleaning properties of titanium dioxide (TiO 2 ) [19], it has been considered to be the most efficient, stable and cheap photocatalytic material available. Consequently, nno-TiO 2 application to various substrates, such as textiles, plastics and glasses, thus to confer self-cleaning property has been widely reported [20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Facile synthesis of casein-based TiO 2 nanocomposite for self-cleaning and high covering coatings: Insights from TiO 2 dosage

Fan

et al. 2016

Progress in Organic Coatings

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Section: Introductionmentioning

confidence: 99%

Facile synthesis of casein-based TiO 2 nanocomposite for self-cleaning and high covering coatings: Insights from TiO 2 dosage

Fan

et al. 2016

Progress in Organic Coatings

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“…Mizukoshi et al fabricated a sulfur-doped TiO 2 layer on a Ti substrate using anodic treatment in sulfuric acid, and then revealed that the fabricated layer could bleach methylene-blue dye under visible light irradiation [14]. Our research group has synthesized a visible light responsive nitrogen-doped TiO 2 layer through anodic treatment [15][16].…”

Section: Introductionmentioning

confidence: 98%

“…The problem of adhesion was drastically improved by changing the electrolyte solvent to ethylene glycol. We previously reported that the anodic layer fabricated in nitrate/ethylene glycol electrolyte acted as a photocatalyst both under UV-light and visible-light illumination and showed excellent antibacterial performance under both types of illumination [16]. We believe that the anodic treatment using a nitrate/ethylene glycol electrolyte is a promising method for fabricating antibacterial and environmental purification mediums applicable to industry.…”

Section: Introductionmentioning

confidence: 99%

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Surface structure and photocatalytic performance of an anodic oxide layer fabricated on titanium in a nitrate/ethylene glycol electrolyte with different treatment durations

Ohtsu

Yokoi

2016

Surface and Coatings Technology

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Anodic oxidation of titanium substrate in an electrolyte comprising ammonium nitrate in ethylene glycol is an innovative technique for fabricating a visible-light-responsive photocatalytic titanium dioxide (TiO 2) layer. In this study, the effects of the duration of anodization on photocatalytic activity were investigated to improve its performance. Surface morphologies of the fabricated layer were comparatively flat for small durations of anodization, but small cracks were generated when anodizing for over 120 min. The thickness of the layer increased with treatment time up to 60 min, beyond which time no further increase in thickness was observed. The predominant structure of the oxide layer was TiO 2 with a rutile structure, and its amount increased with longer treatment duration. Nitrogen doping was observed in the layer regardless of the duration although its chemical state and photocatalytic activity varied depending on the duration. Under ultraviolet light irradiation, the change in activity was small, whereas the activity was drastically enhanced with longer treatment duration in the case of visible light irradiation. Based on these results, we concluded that the optimum duration of anodization is 60 min in the present setting because a TiO 2 layer showing good photocatalytic activity without any surface cracks could be formed.

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“…We also found that the characteristics of the anodized surface showed a drastic change when ethylene glycol was used as the electrolyte solvent instead of water. 11,12) The surface anodized in nitrate/ethylene glycol electrolyte could form a homogeneous oxide layer without any precipitate, and this oxide layer acted as a photocatalyst under both UV-light and visible light illumination after undergoing the postthermal treatment. The layer with the post-thermal treatment contained both rutile and anatase phases of TiO 2 , and showed excellent antibacterial performance under both types of illumination discussed above.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Performance of an Anodic TiO2 Layer Fabricated in a NH4NO3/Ethylene Glycol Electrolyte with Various Crystallographic Phases

et al. 2019

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Anodizing Ti substrates in an ammonium nitrate/ethylene glycol electrolyte is an innovative process capable of fabricating nitrogen-doped photocatalytic titanium oxide (TiO 2 ) layer in one step. This fabricated layer comprises both rutile and anatase TiO 2 phases; however, a major phase contributing to its excellent visible-light responsive photocatalytic performance is still unknown. In the present work, the crystallographic phase of an anodic layer was controlled by exploiting a post-thermal treatment and relationship between the phase variation and photocatalytic performance was then investigated to determine the major phase contributing to this performance. Post-thermal treatment to the anodic TiO 2 layer had little influence on the surface morphology and nitrogen doping, but the crystallographic phase, more specifically the ratio of anatase to rutile phases, changed with the heating temperature. The photocatalytic activity, evaluated by methylene blue decolorization and ethylene decomposition, increased with an increase in the ratio of anatase phase, while the correlation with the rutile phase was not observed. X-ray diffraction (XRD) analysis using a grazing incidence geometry showed that the anatase phase was concentrated in the topmost surface region when compared with the rutile phase. In conclusion, the variation of the photocatalytic performance was related to the growth of the anatase TiO 2 phase in the layer, with the treatment temperature of 723 K showing the highest photocatalytic activity. [

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Fabrication of a visible-light-responsive photocatalytic antibacterial coating on titanium through anodic oxidation in a nitrate/ethylene glycol electrolyte

Cited by 17 publications

References 31 publications

Facile synthesis of casein-based TiO 2 nanocomposite for self-cleaning and high covering coatings: Insights from TiO 2 dosage

Facile synthesis of casein-based TiO 2 nanocomposite for self-cleaning and high covering coatings: Insights from TiO 2 dosage

Surface structure and photocatalytic performance of an anodic oxide layer fabricated on titanium in a nitrate/ethylene glycol electrolyte with different treatment durations

Photocatalytic Performance of an Anodic TiO<sub>2</sub> Layer Fabricated in a NH<sub>4</sub>NO<sub>3</sub>/Ethylene Glycol Electrolyte with Various Crystallographic Phases

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