Development of monolithic titanium dioxide ceramic photocatalysts with high physical rigidity and photocatalytic activity for underwater use

Kato, Shigekazu; Hattori, Koichiro; Tanaka, Yukimi; Miyazaki, Yukari; Ishii, Genki; Koura, Setsuko; Negishi, Nobuaki

doi:10.1016/j.ceramint.2020.04.268

Cited by 11 publications

(4 citation statements)

References 43 publications

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“…The aragonite nanoneedles are immobilized on stable TiO 2 ceramic 20 . For comparison, we also evaluated the bactericidal action of unmodi ed TiO 2 ceramic and calcite nanocrystals immobilized on TiO 2 ceramic against E. coli K-12.…”

Section: Resultsmentioning

confidence: 99%

“…On the other hand, anatase TiO 2 ceramics calcined at 550°C were used in the photocatalytic (under UV irradiation) experiments. This ceramic photocatalyst is generally more robust in water than other photocatalytic materials and, since its semipermanent use in the water is expected, very suitable for the treatment of drinking water in developing countries 20 . Growth Of Aragonite And Calcite On Tio Ceramic Surfaces Commercial mineral water is the most suitable starting material for the growth of acicular aragonite crystals on TiO 2 ceramics.…”

Section: Substrates For Caco Growthmentioning

confidence: 99%

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Aqueous Mechano-Bactericidal Action of Acicular Aragonite Crystals

Negishi

Inaba

Miyazaki

et al. 2021

Preprint

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Nanoneedle structures on dragonfly and cicada wing surfaces or black silicon nanoneedles demonstrate antibacterial phenomena, namely mechano-bactericidal action. These air-exposed, mechano-bactericidal surfaces serve to destroy adherent bacteria, but their bactericidal action in the water is no precedent to report. Calcium carbonate easily accumulates on surfaces during long-term exposure to hard water. We expect that aragonite nanoneedles, in particular, which grow on TiO2 during the photocatalytic treatment of calcium-rich groundwater, exhibit mechano-bactericidal action against bacteria in water. Here, we show that aragonite nanoneedles are grown on TiO2 ceramics from the calcium bicarbonate in mineral water exhibit mechano-bactericidal action against E. coli K-12 in water. Unmodified, calcite-modified as references and aragonite-modified TiO2 ceramics were exposed to water containing E. coli K-12 (in a petri dish), and their bactericidal action over time was investigated under static and agitated conditions. The surfaces of the materials were observed by scanning electron microscopy, and the live/dead bacterial cells were observed by confocal laser scanning microscopy. Further, the synergistic bactericidal performance achieved by mechano-bactericidal action and photocatalysis was demonstrated. Aragonite itself has a high biological affinity for the human body different from the other whisker-sharpen nano-materials, therefore, the mechano-bactericidal action of acicular aragonite in water is expected to inform the development of safe water purification systems for use in developing countries.

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Section: Resultsmentioning

confidence: 99%

Section: Substrates For Caco Growthmentioning

confidence: 99%

Aqueous Mechano-Bactericidal Action of Acicular Aragonite Crystals

Negishi

Inaba

Miyazaki

et al. 2021

Preprint

Self Cite

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Section: Methodsmentioning

confidence: 99%

Aqueous mechano-bactericidal action of acicular aragonite crystals

Negishi

Inaba

Miyazaki

et al. 2021

Sci Rep

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Nanoneedle structures on dragonfly and cicada wing surfaces or black silicon nanoneedles demonstrate antibacterial phenomena, namely mechano-bactericidal action. These air-exposed, mechano-bactericidal surfaces serve to destroy adherent bacteria, but their bactericidal action in the water is no precedent to report. Calcium carbonate easily accumulates on solid surfaces during long-term exposure to hard water. We expect that aragonite nanoneedles, in particular, which grow on TiO2 during the photocatalytic treatment of calcium-rich groundwater, exhibit mechano-bactericidal action against bacteria in water. Here, we showed that acicular aragonite modified on TiO2 ceramics prepared from calcium bicarbonate in mineral water by photocatalysis exhibits mechanical bactericidal activity against E. coli in water. Unmodified, calcite-modified and aragonite-modified TiO2 ceramics were exposed to water containing E. coli (in a petri dish), and their bactericidal action over time was investigated under static and agitated conditions. The surfaces of the materials were observed by scanning electron microscopy, and the live/dead bacterial cells were observed by confocal laser scanning microscopy. As a result, the synergistic bactericidal performance achieved by mechano-bactericidal action and photocatalysis was demonstrated. Aragonite itself has a high biological affinity for the human body different from the other whisker-sharpen nanomaterials, therefore, the mechano-bactericidal action of acicular aragonite in water is expected to inform the development of safe water purification systems for use in developing countries.

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“…however, the defects of the coatings usually enabled the penetration of electrolytes and put the substrate at risk of corrosion. The applications of Tio 2 coated materials include moisture-saturated air, such as corrosive marine [38,39] or tropic [40] climate with high atmospheric humidity or underwater conditions [41][42][43]. as a result the electrochemical corrosion can be enhanced by pollutants, e.g.…”

Section: Introductionmentioning

confidence: 99%

Archives of Metallurgy and Materials

Lachowicz

Winnicki

2021

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Corrosion Damage meChanisms of Tio 2 ColD-sprayeD CoaTings cold spraying as a low-temperature coating deposition method is intended for thermally sensitive materials. Due to its precise temperature control, it limits the formation of structural defects, and can therefore be easily applied to spray corrosion protective coatings made from metal or metal-ceramic powders. however, the formation of pure ceramic coatings with the use of cold spraying is still not so common. Titanium dioxide is one of the most interesting ceramics due to its photocatalytic properties. nevertheless, these types of coating materials usually work in a corrosion favoring humid atmosphere. in the presented paper, amorphous Tio 2 powder was deposited onto aluminum alloys and steel substrates and then submitted to potentiodynamic corrosion tests in a 3.5 wt.% nacl solution. The as-sprayed coating showed phase transition from amorphous Tio 2 to anatase, and also revealed porosity. as a result, electrolytes penetrated the coating and caused undercoating corrosion in the tested environment of an aqueous nacl solution. The analysis of the potentiodynamic curves showed that the presence of the coating decreased corrosion potential on both substrates. it arose from the mixed phases of Tio 2 , which consisted of photocathode -amorphous material and photoanode -crystalline anatase. The phase mixture induced the galvanic corrosion of metallic substrates in the presence of electrolytes. Moreover, pitting-like corrosion and coating delamination were detected in aluminium alloy and steel samples, respectively. Finally, the corrosion mechanism of the titanium dioxide coatings was characterized and described.

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Development of monolithic titanium dioxide ceramic photocatalysts with high physical rigidity and photocatalytic activity for underwater use

Cited by 11 publications

References 43 publications

Aqueous Mechano-Bactericidal Action of Acicular Aragonite Crystals

Aqueous Mechano-Bactericidal Action of Acicular Aragonite Crystals

Aqueous mechano-bactericidal action of acicular aragonite crystals

Archives of Metallurgy and Materials

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