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首页> 外文期刊>Journal of Environmental Science and Health >Photolytic degradation of sulfamethoxazole and trimethoprim using UV-A, UV-C and vacuum-UV (VUV)
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Photolytic degradation of sulfamethoxazole and trimethoprim using UV-A, UV-C and vacuum-UV (VUV)

机译：使用UV-A，UV-C和真空UV（VUV）光降解磺胺甲恶唑和甲氧苄啶

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The photolytic degradation of the non-degradable pharmaceuticals sulfamethoxazole (SMX) and trimethoprim (TMP) in an aqueous solution was investigated using three kinds of low-pressure mercury lamp UV-A (352 nm), UV-C (254nm), and vacuum-UV (VUV, 185nm and 254nm). The degradation rates were highly dependent on the target compounds as well as the UV sources. No degradation of the target compounds was observed using UV-A treatment, because there was no overlap between the UV-A emission spectrum and absorption spectrum of the target compounds. On the other hand, UVC and VUV revealed higher reactivity. The results also indicated that SMX had a greater potential to react photochemically than TMP. Among the UV sources, VUV was the most effective process for the degradation of target compounds. Furthermore, the addition of oxidants such as hydrogen peroxide (H2O2) and sodium persulfate (Na2S2O8) to the reaction system improved the overall degradation rate significantly.The experimental results for the VUV-irradiated samples with the addition of methanol as a hydroxyl radical scavenger revealed that hydroxyl radicals contribute significantly to the elimination of the target compound. Overall, the degradation rate of the target compounds was in the order: VUV = UV-C > UV-A for sulfamethoxazole and VUV/H2O2 > VUV/ Na2S2O8 > VUV >UV-C >UV-A for trimethoprim.
机译：使用三种低压汞灯UV-A（352 nm），UV-C（254nm）和真空对非降解药物磺胺甲恶唑（SMX）和甲氧苄啶（TMP）在水溶液中的光降解进行了研究-UV（VUV，185nm和254nm）。降解速率高度依赖于目标化合物以及紫外线源。使用UV-A处理未观察到目标化合物的降解，因为目标化合物的UV-A发射光谱和吸收光谱之间没有重叠。另一方面，UVC和VUV显示出较高的反应性。结果还表明，SMX比TMP具有更大的光化学反应潜力。在紫外线源中，VUV是降解目标化合物的最有效方法。此外，在反应体系中加入氧化剂如过氧化氢（H2O2）和过硫酸钠（Na2S2O8）显着提高了整体降解率.VUV辐照样品中加入甲醇作为羟基自由基清除剂的实验结果表明羟基显着有助于消除目标化合物。总体而言，目标化合物的降解速度依次为：对于磺胺甲恶唑，VUV = UV-C> UV-A，对于甲氧苄氨嘧啶，VUV / H2O2> VUV / Na2S2O8> VUV> UV-C> UV-A。

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