Degradation of 4-chlorophenol in aqueous solution by γ-radiation and ozone oxidation |
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| Authors: | Hu Jun Wang Jianlong and Chen Rong |
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| Institution: | (1) Laboratory of Environmental Technology, Institute of Nuclear Energy Technology, Tsinghua University, Beijing, 100084, China;(2) State Key Joint Laboratory of Environmental Simulation and Pollution Control, Tsinghua University, Beijing, 100084, China |
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| Abstract: | 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 mineralization 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 revealed that the combination of radiation and ozonation resulted in synergistic effect, which can remarkably increase
the degradation efficiency of 4-CP. |
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| Keywords: | radiolysis 4-chlorophenol priority pollutant degradation O3 synergistic effect kinetics |
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