Gamma irradiation of 2-mercaptobenzothiazole aqueous solution in the presence of persulfate  

作　　者：Qiburi Bao Lujun Chen Jinping Tian Jianlong Wang 

机构地区：[1]College of Environment and Resources, Jilin University [2]School of Environment, Tsinghua University [3]Zhejiang Provincial Key Laboratory of Water Science and Technology [4]Laboratory of Environmental Technology, Institute of Nuclear and New Energy Technology, Tsinghua University

出　　处：《Journal of Environmental Sciences》2016年第8期252-258,共7页环境科学学报（英文版）

基　　金：the National Hi-Tech Research and Development Program(863)of China(No.2009AA063905);supported by the Chinese Ministry of Science and Technology and the Independent Research Project(No.20101081929);supported by Tsinghua University

摘　　要：Recently, water treatment by ionizing radiation has gained increasing attention as a powerful technology for the destruction of refractory pollutants. 2-Mercaptobenzothiazole（MBT） is known as a widespread, toxic and poorly biodegradable pollutant. This paper studied the gamma irradiation of aqueous solutions of MBT. Moreover, the effect of the addition of persulfate（S2O82-） on the radiolytic destruction of MBT was investigated. The main transformation products of the studied compound were detected and the sequence of occurrence of the products was described. The change of biodegradability of MBT solution was also observed. The main results obtained in this study indicated that gamma radiation was effective for removing MBT in aqueous solution. Persulfate addition, which induced the formation of reactive sulfate radicals（SO4-U）, greatly enhanced the degradation of MBT. Benzothiazole was identified as the first radiation product, followed by 2-hydroxybenzothiazole. Decomposition of MBT started with the oxidation of –SH groups to sulfate ions. Possible pathways for MBT decomposition by gamma irradiation were proposed. The BOD/COD ratios of MBT samples were increased after radiation,indicating the improvement of biodegradability and reduction of toxicity.Recently, water treatment by ionizing radiation has gained increasing attention as a powerful technology for the destruction of refractory pollutants. 2-Mercaptobenzothiazole（MBT） is known as a widespread, toxic and poorly biodegradable pollutant. This paper studied the gamma irradiation of aqueous solutions of MBT. Moreover, the effect of the addition of persulfate（S2O82-） on the radiolytic destruction of MBT was investigated. The main transformation products of the studied compound were detected and the sequence of occurrence of the products was described. The change of biodegradability of MBT solution was also observed. The main results obtained in this study indicated that gamma radiation was effective for removing MBT in aqueous solution. Persulfate addition, which induced the formation of reactive sulfate radicals（SO4-U）, greatly enhanced the degradation of MBT. Benzothiazole was identified as the first radiation product, followed by 2-hydroxybenzothiazole. Decomposition of MBT started with the oxidation of –SH groups to sulfate ions. Possible pathways for MBT decomposition by gamma irradiation were proposed. The BOD/COD ratios of MBT samples were increased after radiation,indicating the improvement of biodegradability and reduction of toxicity.

关 键 词：Gamma irradiation 2-Mercaptobenzothiazole Persulfate Synergetic effect Benzothiazole 2-Hydroxybenzothiazole 

分 类 号：X703[环境科学与工程—环境工程]