In this paper,the photochemical reaction of p-chlorotoluene(PCT)with superoxide anion radical(O2-·)in atmospheric aqueous phase was investigated by irradiating a mixture of riboflavin(Rf)and PCT with 365 nm ultraviolet light.The influences of PCT and Rf initial concentration,ini-tial pH value of the solution and droplet size on the photoinduced reaction were investigated,and the photoinduced conversion products were analyzed using gas chromatography-mass spectrometry(GC-MS).The results show that O2-·can be generated by Rf under 365 nm ultraviolet light excitation,and the second-order reaction rate constant of PCT with O2-·is 2.66 L/(mol·s).The conversion rate of PCT first increases and then decreases with the increase of Rf concentration,and decreases with the increase of initial pH value.The droplet size has a great influence on the conversion rate of PCT.The conversion rate of PCT when the droplet diameter is 2-3 mm is 6.3 times that of the solu-tion under 5 min illumination.
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