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中文摘要：
采用C类紫外线或称为短波紫外线（即UV-C）辐照降解水中磺胺类药物,考察了磺胺类药物种类、UV光强、磺胺类药物初始浓度、反应液pH对降解效果的影响。结果表明UV-C辐照对磺胺嘧啶、磺胺甲基嘧啶和磺胺甲恶唑的降解过程均符合拟一级反应动力学。UV-C辐照技术对磺胺甲恶唑的去除率最高,在反应液pH为7,光强为142μW/cm^2,初始浓度为0.02mmol/L条件下,辐照30 min后磺胺甲恶唑去除率达到67.80%,而磺胺嘧啶和磺胺甲基嘧啶去除率仅15%左右。通过增大紫外光强和减小初始浓度,可提高反应速率和磺胺甲恶唑去除率。反应液pH对反应效果的影响显著,酸性条件更利于UV-C辐照降解磺胺甲恶唑。
英文摘要：
The degradation of sulfonamides by UV-C irradiation in aqueous solutions was investigated and the effects of type of sulfonamides,irradiation intensity,initial concentration and pH value on the removal of sulfonamides were evaluated.The results indicate that the UV-C degradation of sulfadiazine,sulfamerazine and sulfamethoxazole well follow pseudo first order kinetic.At pH of 7 and under the conditions of 142 μW /cm^2 irradiation intensity and 0.02 mmol /L initial concentration,67.80% sulfamethoxazole and only about 15% sulfadiazine and sulfamerazine are removed by UV-C irradiation after 30 min.The photodecomposition rate and removal of sulfamethoxazole can be enhanced by increasing UV-C irradiation intensity and decreasing initial concentration.Sulfamethoxazole UV-C degradation rate is greatly influenced by pH of the solution and in acid condition,degradation rate was higher.
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