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Chemicals, plastics and rubber industries

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Sonochemical degradation rates of volatile solutes

Article Abstract:

The degradation rates of chlorinated ethanes, ethenes and methanes in aqueous solutions sonicated at frequencies of 205, 358, 618 and 1078 kHz were investigated. Results showed that the degradation rates are consistent with total decomposition of the solute contained in collapsing bubbles and are about 15% ultrasound power efficiency for transient cavitation. These findings indicate that the degradation rates are proportional to the density of the bubbles excited per unit time.

Author: Hoffmann, Michael R., Colussi, A.J., Hung, Hui-Ming
Publisher: American Chemical Society
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 1999
Methane, Chemical reactions, Ethanes, Ethane, Olefins, Alkenes

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Infrared spectra of photoinduced species on hydroxylated titania surfaces

Article Abstract:

Transient and persistent diffuse reflectance infrared signals from surface intermediates generated by band gap irradiation of polycrystalline, hydroxylated TiO2 under controlled atmospheres is detected. The upward baseline shift following irradiation in vacuo is interpreted as evidence of the presence of mobile charge carriers that, by enhancing the refractive index, adecrease the infrared reflectivity of TiO2 surfaces.

Author: Hoffmann, Michael R., Szczepankiewicz, Stephen H., Colussi, A.J.
Publisher: American Chemical Society
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2000
Science & research, Usage, Electric properties, Chemistry, Physical and theoretical, Physical chemistry, Infrared spectroscopy, Titanium compounds, Hydroxylation

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Oxidative power of nitrogen-doped TiO2 photocatalyst under visible illuminatio

Article Abstract:

Nitrogen doping is known to extend the absorptivity of TiO2 photocatalysts into the visible. The study presented reports that N-doped TiO2 materials fail to catalyze the oxidation of HCOO(super -) into CO(sub 2)(super .-), or of NH(sub 3-)OH(super +) into NO(sub 3)(super -), under visible illumination.

Author: Hoffmann, Michael R., Colussi, A.J., Mrowetz, Marta, Balcerski, William
Publisher: American Chemical Society
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2004
Nitrogenous Fertilizer Manufacturing, Nitrogenous fertilizers, Ammonia, Methods, Oxidation-reduction reaction, Oxidation-reduction reactions, Titanium dioxide

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Subjects list: Research, Chemical properties
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