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1, 2, 4-trichlorobenzene is a kind of organic contamination which is difficult to be decomposed by normal methods[1-5].1, 2, 4-trichlorobenze at initial mass concentration of 200 mg/L in aqueous was irradiated with electron beam in a laboratory-scale. The irradiation was performed at room temperatures with a GJ-2-Ⅱ accelerator (Shanghai X ianfeng Motors), with 1.5 MeV 1 mA E-beams. Practical range of the electrons is about 0.7g/cm2. The samples, each of 20mL with a 4 mm depth, were placed at 30 cm under the titanium window and scanned by the E-beams at a dose rate of 3.5 kGy/s, as was determined by membrane. concentration method with GC. Doses delivered to the samples were 35, 70, 105, 140, 210 and 280kGy, respectively.It was found that trichlorobenzene concentration of the sample solution decreased after the irradiation,whereas its mass concentration of chlorine ions increased, with pH value of the irradiated solution being 2 to 3.Trichlorobenzene was decomposed completely by 105kGy irradiation, and dechloride rate of trichlorobenzene reached 100% at 210kGy. Benzene collar was destroyed by the irradiation. Fig. 1 and Fig.2 are GC results oftrichlorobenzene at initial concentration and after being irradiate to 70 kGy.The results show that decomposion of trichlorobenzenes by E-beam irradiation is an efficient method.Dechloride of chlorobenzenes can be done by 105 kGy E-beam irradiation. And conbined with other methods, the radiation treatment would be efficiently to remove chlorobenzenes in wastewater and to protect the environment.