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Degradation of 4-chlorophenol in aqueous solution by γ-radiation and ozone oxidation

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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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Authors and Affiliations

  1. Laboratory of Environmental Technology, Institute of Nuclear Energy Technology, Tsinghua University, Beijing, 100084, China

    Hu Jun, Wang Jianlong & Chen Rong

  2. State Key Joint Laboratory of Environmental Simulation and Pollution Control, Tsinghua University, Beijing, 100084, China

    Wang Jianlong

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  1. Hu Jun
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  2. Wang Jianlong
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  3. Chen Rong
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Correspondence to Wang Jianlong.

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Hu, J., Wang, J. & Chen, R. Degradation of 4-chlorophenol in aqueous solution by γ-radiation and ozone oxidation. SCI CHINA SER B 49, 186–192 (2006). https://doi.org/10.1007/s11426-006-0186-y

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  • DOI: https://doi.org/10.1007/s11426-006-0186-y

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