Abstract: The dringing wa ter including halogenated compound, such as CHCl₃, has been handled by photocatalys t : the powder of TiO₂.The optimum photo removal condi t ions are as fol lows: the mas s c oncentration of CHC_l3 is 100 g/ L and its Volume is 50 ml, the quanti ty of eatalyst is 0. 4 g, the time of photo radiation is 3. 0 h, the acidi ty of the aqueous solut ion is 1 *10^{- 9} mol/ L [ H+] , the photo removal ratio of CHCl₃ is over 95. 0%. At the same time, the mechanism of photocatalytic conversion of CHCl₃ has been preliminari ly probed, and i t is proved that TiO₂ photo removal of CHCl₃ follows the formula of one - order reaction rate: ln C= - 0. 75t+ 4. 30.

Key words:  , titanium(TiO₂) , photocatalysis, halogenated compound