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

Science china Chemistry 2006年第2期49卷 186-192页

作者： HU Jun1, wang jianlong1,2.& CHEN Rong1 1. {2. 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 correspondence should be addressed to wang jianlong 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

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 (0.02.4 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.

关键词： radiolysis, 4-chlorophenol, priority pollutant, degradation, O3, synergistic effect, kinetics.

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Heterogeneous reactions on the surface of fine particles in the atmosphere

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Chinese Science Bulletin 2003年第21期48卷 2267-2276页

作者： DING Jie & ZHU Tong state key {2. laboratory of environmental simulation and pollution control, College of environmental Sciences, Peking university, beijing 100871, china {12. should be addressed to Zhu Tong (e-mail:tzhu@ ***) state key {2. laboratory of environmental simulation and pollution control College of Environmental Sciences Peking University China

Fine particles play an important role in the atmosphere. Research on heterogeneous reactions on the surface of fine particles is one of the frontier areas of atmospheric science. In this paper, physical and chemical characteristics of fine particles in the atmosphere and the interactions between trace gases and fine particles are described, methods used in heterogeneous reactions research are discussed in detail, progress in the study of heterogeneous reactions on the surface of fine particles in the atmosphere is summarized, existing important questions are pointed out and future research directions are suggested.

关键词：细微颗粒大气科学多相反应空气动力学

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