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

• Published in: Science China. Chemistry Vol. 49; no. 2; pp. 186 - 192
• Main Authors: Hu, Jun, Wang, Jianlong, Chen, Rong
• Format: Journal Article
• Language: English
• Published: Heidelberg Springer Nature B.V 01.04.2006; State Key Joint Laboratory of Environmental Simulation and Pollution Control, Tsinghua University, Beijing 100084, China; Laboratory of Environmental Technology, Institute of Nuclear Energy Technology, Tsinghua University, Beijing 100084, China%Laboratory of Environmental Technology, Institute of Nuclear Energy Technology, Tsinghua University, Beijing 100084, China
• Subjects: Aqueous solutions; Butanol; Chlorophenol; Degradation; Free radicals; Gamma rays; Organic carbon; Oxidation; Radiation; Radiation dosage; Sodium bicarbonate; Synergistic effect; priority pollutant; O3; 4-chlorophenol; degradation; kinetics; radiolysis; synergistic effect
• ISSN: 1006-9291; 1674-7291; 1862-2771; 1869-1870
• DOI: 10.1007/s11426-006-0186-y

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.