Relationship between Photocatalytic Activity and Ti<sup>3+</sup>Defects in Acid-Leached Titanium Dioxide / Hydroxyapatite Composite

Ono, Yoshiki; Rachi, Takeshi; Okuda, Tetsuya; Yokouchi, Masahiro; Kamimoto, Yoshihito; Nakajima, Akira; Okada, Kiyoshi

doi:10.1088/1757-899x/18/3/032017

Cited by 2 publications

(1 citation statement)

References 19 publications

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“…Besides, there are no signals attributed by trapped electrons (g = 1.988) and crystalline defects (g = 1.999) from Ti-HAp [43] as well as by oxygen radical in TiO 2 (g=2.003) [44]. Moreover, the typical signal caused by anatase Ti 3+ defects (g = 1.992) [45] does not appear in our synthesized HAp/TiO 2 composites and the synthesized TiO 2 particles without HAp (figure 8(c)). This case would be directly related to the low-temperature generation of oxygen radicals by the anisotropic distortion of HAp lattice stabilized in the composite interface.…”

Section: Esr Analysismentioning

confidence: 97%

HAp/TiO₂ heterojunction catalyst towards low-temperature thermal oxidation of VOC

Kato¹,

Kobayashi²,

Xin³

et al. 2022

Mater. Res. Express

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Ceramic catalyst without precious metals and rare-earth elements is a promising technology for removing volatile organic compounds (VOC) produced in the manufacturing process to feasibly solve worldwide health and environmental problems. We first investigate the influence of hydroxyapatite (HAp)/TiO2 heterojunction formation on the temperature dependence of VOC catalytic performance. The comprehensive evaluation by XRD, FT-IR, UV-vis, and in-situ ESR clarifies that the anisotropic crystal distortion along the c-axis of HAp lattice is caused by hydrolysis and hetero-condensation TiO2 precursor accompanying with the defective structure in HAp. The structural modified HAp (m-HAp) provides the notable alteration of optical bandgap with the visible-light coloration and the preferential generation of oxygen radical. Furthermore, we propose a new model that the m-HAp/TiO2 heterojunction should be a possible main factor affecting the more than twice higher catalytic performance in thermal oxidation of ethyl acetate at a lower temperature, as typically shown in HAp-T1.

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Section: Esr Analysismentioning

confidence: 97%

HAp/TiO₂ heterojunction catalyst towards low-temperature thermal oxidation of VOC

Kato¹,

Kobayashi²,

Xin³

et al. 2022

Mater. Res. Express

View full text Add to dashboard Cite

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Highly active aggregate photocatalyst with hierarchically porous structures synthesized by using a hydroxyapatite template

Ono

2016

Materials Research Bulletin

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Relationship between Photocatalytic Activity and Ti³⁺Defects in Acid-Leached Titanium Dioxide / Hydroxyapatite Composite

Cited by 2 publications

References 19 publications

HAp/TiO₂ heterojunction catalyst towards low-temperature thermal oxidation of VOC

HAp/TiO₂ heterojunction catalyst towards low-temperature thermal oxidation of VOC

Highly active aggregate photocatalyst with hierarchically porous structures synthesized by using a hydroxyapatite template

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Relationship between Photocatalytic Activity and Ti3+Defects in Acid-Leached Titanium Dioxide / Hydroxyapatite Composite

Cited by 2 publications

References 19 publications

HAp/TiO2 heterojunction catalyst towards low-temperature thermal oxidation of VOC

HAp/TiO2 heterojunction catalyst towards low-temperature thermal oxidation of VOC

Highly active aggregate photocatalyst with hierarchically porous structures synthesized by using a hydroxyapatite template

Contact Info

Product

Resources

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Relationship between Photocatalytic Activity and Ti³⁺Defects in Acid-Leached Titanium Dioxide / Hydroxyapatite Composite

HAp/TiO₂ heterojunction catalyst towards low-temperature thermal oxidation of VOC

HAp/TiO₂ heterojunction catalyst towards low-temperature thermal oxidation of VOC