The photon's flow of the emitted radiations was determined by ferricoxalate actinometry [16] and a value of l0=508*10-6 einstein/s was found. Solutions with (0.37-8.45)*10-4 M NB content were photo-oxidized in the following working conditions:pH = 4-10; photocatalyst dose= 50-500 mg/L; irradiation time = 30-240 min.Prior to irradiation, the required photocatalyst dose was added to the samples, and solutions were bubbled with air (50 L/h), the dark, for 30 min.