| 摘要 |
PURPOSE: To decomposed efficiently and completely an organic chlorine compd. in air by using a photocatalyst by a method wherein org. chlorine compd.-contg. air is irradiated with ultraviolet rays with a specified wavelength and then, it is introduced into the presence of the photocatalyst and it is irradiated with a light beam which can excite this photocatalyst. CONSTITUTION: E.g. air contg. an org. chlorine compd. such as methyl chloride is irradiated with ultraviolet rays with wavelength of at most 300nm. When the org. chlorine compd. is excited by absorbing ultraviolet rays and becomes unstable, the chlorine atom is released and the concn. of the org. chlorine compd. can be efficiently decreased. However, the org. chlorine compd. cannot be completely decomposed to carbon dioxide only by this reaction and reaction intermediates remain. As these reaction intermediates have such properties as being easily adsorbable on the surface of a photocatalyst such as titanium dioxide, they can be completely decomposed to carbon dioxide on the surface of the photocatalyst in the next process. |
