Degradation of chlorotetracycline by electron beam irradiation in aqueous solution
XIAO Yang1,2, LUO Min2, MA Ling-ling2, ZHANG Yang1,2, XU Dian-dou2, WU Ming-hong1, XU Gang1
1. College of Environment and Chemical Engineering, Shanghai University, Shanghai 200444, China;
2. Division of Nuclear Technology and Applications, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
The process of removing chlorotetracycline (CTC) 30mg/L in aqueous solution was preliminarily explored by electron beam irradiation (EBI). Several factors such as dose, the existence of tert-butyl alcohol under different atmosphere conditions, initial pH and inorganic salts affecting on the removal efficiency were examined. Degradation mechanism and the toxicity of degradation products were proposed through experimental data. The experiment results show that:EB irradiation can effectively remove CTC from water, and the reduction radicals play the key role; It was more effective when pH is alkaline; the presence of 0.005mol/LCO32-、SO42-、NO3- or Cl- promotes the degradation. Ten kinds of possible degradation products and corresponding degradation pathways were deduced from the analysis of the degradation products by ultra-high performance liquid chromatography-mass spectrometry (UHPLC-MS) with the assistance of theoretical calculation results. Finally, the toxicity test of Vibrio fernuli shows that the toxicity of the irradiated intermediates increases firstly and then decrease slowly, however, it is still toxic at the absorption dose of 5.0kGy.
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