Possible Impact of Heterogeneous Photocatalysis on the Global Chemistry of the Earth's Atmosphere
作者:
KirillI. Zamaraev,
MichailI. Khramov,
ValentinN. Parmon,
期刊:
Catalysis Reviews
(Taylor Available online 1994)
卷期:
Volume 36,
issue 4
页码: 617-644
ISSN:0161-4940
年代: 1994
DOI:10.1080/01614949408013930
出版商: Taylor & Francis Group
关键词: Aerosols;Atmospheric dust;Chemistry of the atmosphere;Photocatalysis;Solar light
数据来源: Taylor
摘要:
Photochemistry is recognized to be important for various physicochemical processes in the atmosphere, such as formation of the ozone layer and smogs, degradation of waste substances, etc. [1]. However, up to the present the emphasis in atmospheric photochemistry has been mainly on the study of photochemical reactions that occur with molecules directly excited by absorption of light quanta. However, the major components and impurities of the earth's atmosphere (such as nitrogen, oxygen, water, carbon dioxide, methane, methane halides, etc.) are totally transparent to most solar radiation. Electronically excited states of these molecules are formed only upon absorption of vacuum ultraviolet light quanta with energyhv≥ 5 eV (i.e., with wavelength λ ≤ 200 nm). Only a small portion of the energy of solar light is found in this spectral region. In other words, most of the energy of the solar flux cannot participate in such direct photochemical reactions.
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