Photo-oxidation of gaseous ethanol on photocatalyst prepared by acid leaching of titanium oxide/hydroxyapatite composite

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

doi:10.1016/j.materresbull.2013.02.067

Cited by 6 publications

(2 citation statements)

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“…The titania plasma column generated by localized microwaves in air atmosphere may also be used for metallurgical applications, such as metal treatments for surface hardening. In other applications, the collector substrates, onto which titanium dioxide is deposited, can be used, for example, in photo-catalytic devices [9][10][11][12][13][14] due to the pertinent titania properties.…”

Section: Discussionmentioning

confidence: 99%

“…Plasma column and nano-powder generation from solid titanium by localized microwaves in air I. INTRODUCTION Titanium dioxide (titania) in its various forms 1 is widely used, for instance, in applications related to air cleaning, [2][3][4] water purification, [5][6][7][8] photo-catalysts, [9][10][11][12][13][14] semiconductors, 15,16 solar energy conversion, 17,18 paints, pigments, 19,20 food coloring, and sunscreens. [21][22][23] Titania has three main types of crystalline polymorphs, namely, rutile, anatase, and brookite.…”

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Plasma column and nano-powder generation from solid titanium by localized microwaves in air

Popescu

Jerby

Meir

et al. 2015

Journal of Applied Physics

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International audienceThis paper studies the effect of a plasma column ejected from solid titanium by localized microwaves in an ambient air atmosphere. Nanoparticles of titanium dioxide (titania) are found to be directly synthesized in this plasma column maintained by the microwave energy in the cavity. The process is initiated by a hotspot induced by localized microwaves, which melts the titanium substrate locally. The molten hotspot emits ionized titanium vapors continuously into the stable plasma column, which may last for more than a minute duration. The characterization of the dusty plasma obtained is performed in-situ by small-angle X-ray scattering (SAXS), optical spectroscopy, and microwave reflection analyses. The deposited titania nanoparticles are structurally and morphologically analyzed by ex-situ optical and scanning-electron microscope observations, and also by X-ray diffraction. Using the Boltzmann plot method combined with the SAXS results, the electron temperature and density in the dusty plasma are estimated as ∼0.4 eV and ∼1019 m−3, respectively. The analysis of the plasma product reveals nanoparticles of titania in crystalline phases of anatase, brookite, and rutile. These are spatially arranged in various spherical, cubic, lamellar, and network forms. Several applications are considered for this process of titania nano-powder production

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