Large enhancement of photocatalytic activity by chemical etching of TiO2 crystallized glass

Yoshida, Kazuki; Takahashi, Yoshihiro; Ihara, Rie; Terakado, Nobuaki; Fujiwara, Takeshi; Kato, Hideki; Kakihana, Masato

doi:10.1063/1.4897961

Cited by 13 publications

(4 citation statements)

References 17 publications

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“… Titania glass–ceramics photocatalyst Form of the sample BET surface area / m 2 g −1 Reaction medium Light source Rated power / W Rate of H 2 production Ref / µmol h -1 cm −2 / µmol h -1 g cat. −1 Pt/MTP35 etched glass (9 × 9 × 1 mm) 26.5 MeOH + H 2 O (1:1) Hg lamp 100 9.6 35.7 This work MTP40 etched glass (12 × 10 × 1 mm) 17.3 MeOH + H 2 O (1:1) Hg lamp 100 0.73 5.7 This work Pt/TZBAS etched glass (30 × 30 × 1 mm) MeOH + H 2 O (1:9) Xe lamp (< 500 nm) 300 0.12 30 Pt/TBZA-BN non-etched glass (30 × 30 × 1 mm) MeOH + H 2 O (1:9) Xe lamp (< 500 nm) 300 0.021 31 Pt/TBZA-BN non-etched glass (30 × 30 × 1 mm) MeOH + H 2 O (1:9) Xe lamp (> 440 nm) 300 0.009 31 …”

Section: Resultsmentioning

confidence: 99%

Photocatalytic hydrogen generation of monolithic porous titanium oxide-based glass–ceramics

Masai

Sakurai

Koreeda

et al. 2020

Sci Rep

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A large relative surface area is crucial for high catalytic activity. Monolithic catalysts are important catalytic materials because of minimal self-degradation. Regarding large surface area catalysts, the glass-ceramics (Gcs) with high formability, obtained by heat-treatment of the precursor glass, are plausible candidates. this study examines the photocatalytic behaviour of porous Gcs obtained after acid leaching of Mgo-tio 2-p 2 o 5 Gcs. After heat-treatment, anatase tio 2 was precipitated along with other phases. The diffraction intensity ratio between anatase and other phases was the maximum for a heat-treatment temperature of 900 °C. After acid leaching of the GCs, the relative surface area decreased with increasing tio 2 fraction; the surface area was also affected by the sample morphology. H 2 generation was observed from porous Gcs, while Gcs without etching exhibited approximately zero activity. thus, it was demonstrated that high surface area and prevention of the reduction reaction to ti(iii) are important for tailoring monolithic photocatalytic materials. The development of photocatalytic activity without any energy consumption is a major issue in energy harvesting. Use of stable photocatalytic materials using sunlight is one solution. Considering the relative surface area of the sea, water can be a resource for energy harvesting. However, in the case of powdered catalytic materials in a liquid, precipitation of the crystallites at the bottom of the system is inherently unavoidable without stirring, i.e., some energy introduction is required for continuous catalytic activity of the powdered materials in the liquid. Considering spontaneous energy conversion using water, bulk shapes, which can be placed on the surface of water bodies such as seas or lakes, are needed. Therefore, the focus here is on porous bulk photocatalytic materials. TiO 2 is a major oxide semiconductor that possesses high chemical stability and photocatalytic activity. The photocatalytic activity of TiO 2-related materials has been enthusiastically examined the world over. The studies were predominantly on powdered materials, as relative surface area is a dominant factor in achieving high catalytic activity. However, TiO 2 nanofiber, which is a nanostructured TiO 2 , has been recently proposed, in addition to TiO 2 powders 1-17. Although it was reported that a pure porous TiO 2 monolith was demonstrated via the sol-gel method 18 , it is tedious to fabricate materials of large surface area using such nanostructured materials. One approach to fabricating large porous TiO 2 materials is to use a glass-ceramics (GC) route combined with chemical etching 19-24. As glass is in a thermodynamically metastable state at a certain temperature, crystallization occurs above the glass transition temperature T g. Although the crystallization of glass is affected by several factors, such as chemical composition of the mother glass and the heat-treatment temperature, the glass-ceramics-containing preferred crystallites can possess the characteristic...

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Section: Resultsmentioning

confidence: 99%

Photocatalytic hydrogen generation of monolithic porous titanium oxide-based glass–ceramics

Masai

Sakurai

Koreeda

et al. 2020

Sci Rep

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“…Glass weights before and after etching were compared since the weight loss after etching indicates that the B 2 O 3 phase was leached out by the etching. 19) The surface of the glass sample was observed by scanning electron microscopy (SEM).…”

Section: Chemical Etchingmentioning

confidence: 99%

Compositional design for SrTiO<sub>3</sub> crystal precipitation from spinodal-type borosilicate glass containing large amounts of TiO<sub>2</sub>

Hattori

Shimizu

Daiko

2023

J. Ceram. Soc. Japan

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B 2 OSiO 2 borosilicate glasses in a specific composition range show a spinodal-type phase separation by heattreatment at around those glass transition temperatures, and porous glasses or porous glass-ceramics can be easily obtained via an acid treatment after the phase separation. We have studied preparation conditions of SrTiO 3 -precipitated porous glass-ceramics for a photocatalyst of hydrogen generation using solar energy. It was found that the SrTiO 3 crystal was observed for a SrOBaOTiO 2 SiO 2 glass, while the SrTiO 3 crystal disappeared from SrOTiO 2 B 2 O 3 SiO 2 glasses, which contain the B 2 O 3 component necessary for the phase separation. For this problem, we found that co-doping of K 2 O and Al 2 O 3 components is effective, and a SrTiO 3 containing porous glass-ceramic was successfully obtained by the co-doping. Molecular dynamics (MD) simulations were performed to understand the migration of Sr 2+ ions in SrOTiO 2 B 2 O 3 SiO 2 glasses with K 2 O and Al 2 O 3 components. This paper is the first to describe the dynamics of alkali metal/alkaline earth metal ions in those glasses and the mechanism of SrTiO 3 precipitation in borosilicate glasses.

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“…14,15 TiO 2 is a well-known inorganic oxide for its antibacterial activity apart from other useful application like self-cleaning, water splitting, antifogging, paint, toothpaste, metal corrosion prevention, organic compound degradation, lithography. [16][17][18][19][20][21][22][23][24][25][26] TiO 2 -based materials have been evaluated for antibacterial properties for more than three decades. However, a majority of the reported TiO 2 -based materials are nanoparticles either in the powder or coating form.…”

Section: Introductionmentioning

confidence: 99%

“…By now, few limited crystallized glass ceramics like; soda lime glasses (SiO 2 ‐Na 2 O‐CaO‐B 2 O 3 ) and zinc borophosphate glasses (30P 2 O 5 ‐50ZnO‐10CaO‐10B 2 O 3 ) have been reported with embedded nanocrystals in addition to antimicrobial activity and self‐cleaning properties . TiO 2 is a well‐known inorganic oxide for its antibacterial activity apart from other useful application like self‐cleaning, water splitting, antifogging, paint, toothpaste, metal corrosion prevention, organic compound degradation, lithography …”

Section: Introductionmentioning

confidence: 99%

Solar light induced antibacterial performance of TiO₂ crystallized glass ceramics

Kumar

Kushwaha

Singh

et al. 2018

Int J of Appl Glass Sci

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This work investigates the antibacterial potential of TiO2‐based glass‐ceramic. A glass of TiO2 microcrystals embedded in glass matrix of BaO‐TiO2‐B2O3was obtained by melt quench method followed by controlled heat treatment at the 650°C for 3 hours. Crystallization of anatase phase of TiO2 was confirmed by X‐ray diffraction. UV‐visible absorbance and photoluminescence were also recorded. Interestingly band gap of TiO2 glass‐ceramic (crystallized glass) was found to be 2.9 eV. Crystallized glass showed excellent antibacterial property against Escherichia coli in both forms (powder and plate). More than 90% of disinfection was achieved by photocatalytic TiO2 glass‐ceramic surface within one hour of sunlight exposure, which was significantly higher than as‐quenched glass surface and TiO2 glass‐ceramic surface under dark. Intracellular reactive oxygen species (ROS) intensity of bacterial cells in the presence of crystallized glass was almost three times higher than the control and as‐quenched glass under light. Higher production of ROS is major factor for bacterial degradation on crystallized glass surface.

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Large enhancement of photocatalytic activity by chemical etching of TiO2 crystallized glass

Cited by 13 publications

References 17 publications

Photocatalytic hydrogen generation of monolithic porous titanium oxide-based glass–ceramics

Photocatalytic hydrogen generation of monolithic porous titanium oxide-based glass–ceramics

Compositional design for SrTiO<sub>3</sub> crystal precipitation from spinodal-type borosilicate glass containing large amounts of TiO<sub>2</sub>

Solar light induced antibacterial performance of TiO₂ crystallized glass ceramics

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Large enhancement of photocatalytic activity by chemical etching of TiO2 crystallized glass

Cited by 13 publications

References 17 publications

Photocatalytic hydrogen generation of monolithic porous titanium oxide-based glass–ceramics

Photocatalytic hydrogen generation of monolithic porous titanium oxide-based glass–ceramics

Compositional design for SrTiO<sub>3</sub> crystal precipitation from spinodal-type borosilicate glass containing large amounts of TiO<sub>2</sub>

Solar light induced antibacterial performance of TiO2 crystallized glass ceramics

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Solar light induced antibacterial performance of TiO₂ crystallized glass ceramics