Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2016, Vol. 27 ›› Issue (1): 3 doi: 10.1007/s41365-016-0003-z

• NUCLEAR CHEMISTRY,RADIOCHEMISTRY,RADIOPHARMACEUTICALS AND NUCLEAR MEDICINE • Previous Articles     Next Articles

Bromate removal by gamma irradiation in aqueous solutions

Zhao-Lian Ye 1, Xue-Hui Fang 1, Hui-Qi Hou 2   

  1. 1College of Chemistry and Environmental Engineering, Jiangsu University of Technology, Changzhou, 213001, China
    2Department of Environmental Science and Engineering, Fudan University, Shanghai, 200433, China
  • Contact: Zhao-Lian Ye E-mail:bess ye@jsut.edu.cn
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Zhao-Lian Ye, Xue-Hui Fang, Hui-Qi Hou. Bromate removal by gamma irradiation in aqueous solutions.Nuclear Science and Techniques, 2016, 27(1): 3     doi: 10.1007/s41365-016-0003-z

Abstract:

Bromate (BrO?3BrO3?) is a disinfection by-product in drinking water, and its removal is very difficult especially at low levels. 60Co60Co gamma rays were used to remove BrO?3BrO3? in aqueous solution in this study. The effects of absorbed doses, BrO?3BrO3? initial concentration, gas saturation, pH value and coexisting anions (Cl?Cl?, NO?3NO3?, SO2?4SO42? and HCO?3/CO2?3HCO3?/CO32?) on BrO?3BrO3? reduction were evaluated. After 4.0-kGy irradiation of air-equilibrated solution of 30.7 μg/L BrO?3BrO3?, the residual BrO?3BrO3? was 8.3 μg/L, which is below the maximum contaminant level of drinking water. The BrO?3BrO3? reduction rate increased with the dose, in the order of N2>air>O2>N2ON2>air>O2>N2O atmosphere under similar conditions. The results also show that high pH favored the BrO?3BrO3? removal. According to the experimental results, it can be concluded that the efficiency of decomposing BrO?3BrO3? by reactive species followed the order of ?e?aq>?H>HO2?>O?2??eaq?>?H>HO2?>O2??. Coexisting Cl?Cl?, HCO?3/CO2?3HCO3?/CO32? and SO2?4SO42? ions have little effect on BrO?3BrO3? removal, whereas NO?3NO3? can inhibit its removal as a result of competition with BrO?3BrO3? for ?e?aq?eaq?.

Key words: Gamma irradiation, Bromate, Drinking water, Coexisting anion