γ辐照降解水中四环素的研究

γ-RADIATION INDUCED TETRACYCLINE REMOVAL IN AN AQUEOUS SOLUTION

研究了γ辐照对水中四环素(TC)的降解作用,探讨了TC初始浓度、溶液pH值,以及联合H2O2、CH3OH对其辐照降解效果的影响。结果表明:γ辐照可有效降解水中TC。在酸性和碱性条件下,TC降解效果均有明显提高,其中以pH=9时TC去除率最高。添加H2O2可在一定程度上促进TC的γ辐照降解率;而添加CH3OH则明显抑制TC的γ辐照降解。通过量化计算和液质联用(LC-MS)分析发现,γ辐照降解水中TC主要是基于.OH自由基的氧化过程。

Degradation effect of tetracycline（TC） by γ-radiation was investigated in an aqueous solution.The effects of initial concentrations of TC,pH values,combining with H2O2 or CH3OH on degradation of TC were studied.Results showed that TC can be effectively degradated by γ-irradiation in an aqueous solution.Degradation of TC could be remarkably improved both in acid solution and alkaline solution,especially when pH value was 9.0.In addition,H2O2 could gently promote degradation of TC induced by γ-radiation.While,CH3OH markedly restrained degradation of TC induced by γ-radiation.The degradation mechanism of TC was supposed by results of quantum chemical calculations and LC-MS.Results proved that degradation of TC induced by γ-radiation was mainly ascribed to ·OH oxidation.