title: Gamma irradiation of 2-mercaptobenzothiazole aqueous solution in the presence of persulfate.
abstract: 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 (S2O8(2-)) 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(-)), 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.
authors: College of Environment and Resources, Jilin University, Changchun 130021, China. Electronic address: qbr10@jlu.edu.cn.
authors: Qiburi
authors: Q
authors: Bao
authors: School of Environment, Tsinghua University, Beijing 100084, China; Zhejiang Provincial Key Laboratory of Water Science and Technology, Jiaxing 314050, China. Electronic address: chenlj@tsinghua.edu.cn.
authors: Lujun
authors: L
authors: Chen
authors: School of Environment, Tsinghua University, Beijing 100084, China.
authors: Jinping
authors: J
authors: Tian
authors: Laboratory of Environmental Technology, Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China.
authors: Jianlong
authors: J
authors: Wang
mesh_terms: D000935:Antifungal Agents / Q000528:radiation effects*; D052160:Benzothiazoles / Q000528:radiation effects*; D005720:Gamma Rays; D007700:Kinetics; D013440:Sulfides / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000528:radiation effects*
chemical_list: D000935:Antifungal Agents; D052160:Benzothiazoles; D013440:Sulfides; D014874:Water Pollutants, Chemical; C051552:persulfides; C005563:captax
keywords: 2-Hydroxybenzothiazole; 2-Mercaptobenzothiazole; Benzothiazole; Gamma irradiation; Persulfate; Synergetic effect