Degradation kinetics of 2,4-dichlorophenol by gamma ray irradiation in the presence of ozone  

作　　者：Ya-Nan Yin Jun Hu Jian-Long Wang 

机构地区：[1]Collaborative Innovation Center for Advanced Nuclear Energy Technology,INET,Tsinghua University,Beijing 100084,China [2]Beijing Key Laboratory of Radioactive Waste Treatment,INET,Tsinghua University,Beijing 100084,China

出　　处：《Nuclear Science and Techniques》2016年第3期103-107,共5页核技术（英文）

基　　金：supported by the National Natural Science Foundation of China(No.51338005);the Program for Changjiang Scholars and Innovative Research Team in University(IRT-13026);the National High Technology Research and Development Program(No.2009AA063905);the International S&T Cooperation Program(ISTCP)of China(No.2009DFB90600)

摘　　要：Gamma ray-induced degradation of 2,4-dichlorophenol(DCP) in the presence of ozone has been investigated.The results show that ozone can remarkably increase the degradation rate of 2,4-DCP in aqueous solution.The degradation kinetics of 2,4-DCP can be described by the first-order reaction model,and the rate constant was0.443,0.490 and 1.247 h^(-1),respectively,for γ-ray irradiation only,γ-ray irradiation+13 mg/L O_3 and γ-ray irradiation+30 mg/L O_3.High-performance liquid chromatography analysis shows that the dechlorinated products are 4-chlorophenol,2-chlorophenol and phenol;and the oxidation products are hydroquinone,benzoquinone,maleic,fumaric,acrylic,malonic,oxalic,acetic and formic acids.The possible pathways for 2,4-DCP degradation involving all these oxidation products are tentatively proposed.Combining γ-ray irradiation with ozonation is a promising technology for removing toxic pollutants from water and wastewater.Gamma ray-induced degradation of 2,4-dichlorophenol（DCP） in the presence of ozone has been investigated.The results show that ozone can remarkably increase the degradation rate of 2,4-DCP in aqueous solution.The degradation kinetics of 2,4-DCP can be described by the first-order reaction model,and the rate constant was0.443,0.490 and 1.247 h^（-1）,respectively,for γ-ray irradiation only,γ-ray irradiation＋13 mg/L O3 and γ-ray irradiation＋30 mg/L O3.High-performance liquid chromatography analysis shows that the dechlorinated products are 4-chlorophenol,2-chlorophenol and phenol;and the oxidation products are hydroquinone,benzoquinone,maleic,fumaric,acrylic,malonic,oxalic,acetic and formic acids.The possible pathways for 2,4-DCP degradation involving all these oxidation products are tentatively proposed.Combining γ-ray irradiation with ozonation is a promising technology for removing toxic pollutants from water and wastewater.

关 键 词：臭氧氧化技术 Γ射线照射 降解动力学 4-氯酚 氧化产物 γ射线辐照 有毒污染物 辐照降解 

分 类 号：X703[环境科学与工程—环境工程]