The nanosecond laser flash photolysis (LFP) transient spectra of aqueous CCl4 solution

The transient spectra of aqueous CCl4 solution by laser flash photolysis (LFP) was studied in this paper. The transient absorption band (lambda(max) <300nm) of aqueous CCl4 solution bubbled with N-2 was attributed to the trichloromethyl radical (CCl3.) with a 2rd-order decayed reaction rate of 3.80 x 10(8) mol(-1).L.s(-1). The transient absorption band (lambda(max) 320nm) of the same solution bubbled with O-2 was attributed to the peroxytrichloromethyl radical (CCl3O2.) with a 1st-order decay reaction rate of 1.9 x 10(4) s(-1). The transient absorption band around 330 nm of aqueous CCl4 solution always exists insolutions bubbled with either N-2 or O-2 and was attributed to the solvated chlorine atom (Cl). COCl2 as a photolysis product of aqueous CCl4 solution, in the presence of O-2, was observed directly in the transient absorption spectra. The results indicate that CCl4 can be degraded by the photooxidation process.