电子束辐照降解水体中磺胺间甲氧嘧啶

应用电子束辐照初步探索了去除水体中磺胺间甲氧嘧啶（SMM）10mg/L的过程.研究了吸收剂量、自由基清除剂、无机盐等对辐照降解的影响.通过实验数据和模拟计算，推测了降解机理和降解路径，并对降解产物进行了毒性评估.结果表明，当吸收剂量为3.0kGy时，去除率高于99%，辐照降解效率高.在辐照降解过程中，还原消除占主导作用.降解反应遵循一级动力学方程.碳酸根、硫酸根和硝酸根等无机阴离子在一定的程度上会抑制SMM的降解.根据超高效液相色谱-质谱（UHPLC-MS）对降解产物的分析，结合高斯理论模拟，推断出9种可能的降解产物和相应的降解途径.费氏弧菌的毒性测试显示，辐照降解中间体毒性先升高后降低，在吸收剂量为2.0kGy达到最高值.

Studies on the degradation of sulfamonomethoxine by electron beam irradiation in aqueous solution

The process of removing sulfamonomethoxine (SMM) 10mg/L in aqueous systems was preliminarily explored by electron beam irradiation (EBI). Several factors such as absorbed dose, radical scavenger and inorganic salts affecting on the removal efficiency were examined. Degradation mechanism and pathway were proposed through both experimental data and simulation calculation. The toxicity of degradation products was also evaluated. The removal rate of SMM was 99% at 3.0kGy. The data demonstrated that reduction elimination reaction played the key role. SMM degradation fitted the first-order kinetic equation. The degradation efficiency of SMM was inhibited to a certain extent when there were some inorganic ions (CO₃^2-, SO₄^2-, and NO₃^-). Nine 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 by Gaussian 03 software as well. The toxicity test of Vibrio fernuli showed that the toxicity of the irradiated intermediates increased first and then decreased and reached the maximum at the absorption dose of 2.0kGy.