摘要
The degradation of 4-chlorophenol (4-CP) by using gamma rays generated by a 60Co source in the presence of O3 was investigated. The radiolysis of 4-CP and the kinetics of 4-CP min-eralization were analyzed based on the determination of total organic carbon (TOC). The influence of initial 4-CP concentration and the free radicals scavengers (such as NaHCO3 and t-butanol) on the 4-CP degradation was also studied. The results showed that when the radiation rate was 336 Gy·min?1, 4-chlorophenol at concentration of 10 mg·L?1 could be completely degraded at the radiation dose of 2 kGy. The degradation of 4-chlorophenol could be described by a first-order reaction model, the rate constant of 4-CP degradation by combined ozonation and radiation was 0.1016 min?1, which was 2.4 times higher than the sum of radiation (0.0294 min?1) and ozonation (0.0137 min?1). It re-vealed that the combination of radiation and ozonation resulted in synergistic effect, which can re-markably increase the degradation efficiency of 4-CP.
The degradation of 4-chlorophenol (4-CP) by using gamma rays generated by a^(60)Co source in the presence of O_3 was investigated. The radiolysis of 4-CP and the kinetics of4-CP mineralization were analyzed based on the determination of total organic carbon (TOC). Theinfluence of initial 4-CP concentration and the free radicals scavengers (such as NaHCO_3 andt-butanol) on the 4-CP degradation was also studied. The results showed that when the radiation ratewas 336 Gy·min^(-1), 4-chlorophenol at concentration of 10 mg·L^(-1) could be completely degradedat the radiation dose of 2 kGy. The degradation of 4-chlorophenol could be described by afirst-order reaction model, the rate constant of 4-CP degradation by combined ozonation andradiation was 0.1016 min^(-1), which was 2.4 times higher than the sum of radiation (0.0294min^(-1)) and ozonation (0.0137 min^(-1)). It revealed that the combination of radiation andozonation resulted in synergistic effect, which can remarkably increase the degradation efficiencyof 4-CP.
基金
This work was supported by the Chinese Postdoc Fund and the National Natural Science Foundation of China (Grant No. 50325824).
