Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China.
Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China; Geologic Environment Division, Korea Institute of Geoscience and Mineral Resources, Daejeon 34132, South Korea.
Sci Total Environ. 2019 May 10;664:312-321. doi: 10.1016/j.scitotenv.2019.02.006. Epub 2019 Feb 2.
In this work, the degradation of cefalexin, norfloxacin, and ofloxacin was examined via various advanced oxidation processes (AOPs). Direct photolysis by ultraviolet (UV) and vacuum ultra violet (VUV) was less effective for the degradation of fluoroquinolone antibiotics such as norfloxacin and ofloxacin than that of cefalexin. Both hydrogen peroxide (HO) and potassium persulfate (KSO) assisted UV/VUV process remarkably enhanced fluoroquinolone degradation. The addition of KSO was superior to HO under VUV irradiation, with the best removal efficiency of norfloxacin and ofloxacin being almost 100% within 3 min in the presence of VUV/KSO. The ofloxacin degradation rate was accelerated as concentrations of HO and KSO was increased to 3 mM, but the degradation rate was slightly decreased with excess HO (>3 mM). The performance of modified VUV processes (i.e., VUV/HO and VUV/KSO) was inhibited at highly alkaline condition (pH 11). The co-existence of halides (Cl and Br) enhanced antibiotics degradation via the modified VUV processes, but the reaction was almost unaffected in the presence of single halides. This study demonstrated that modified VUV processes (especially VUV/KSO) are efficient for eliminating fluoroquinolone antibiotics from water, which can be considered as a clean and green method for the treatment of antibiotics-containing industrial wastewater.
在这项工作中，通过各种高级氧化工艺（AOPs）研究了头孢氨苄、诺氟沙星和氧氟沙星的降解。与头孢氨苄相比，紫外线（UV）和真空紫外线（VUV）的直接光解对氟喹诺酮类抗生素如诺氟沙星和氧氟沙星的降解效果较差。过氧化氢（HO）和过硫酸钾（KSO）辅助 UV/VUV 工艺显著增强了氟喹诺酮类抗生素的降解。在 VUV 照射下，添加 KSO 优于 HO，在 VUV/KSO 存在下，诺氟沙星和氧氟沙星的最佳去除效率几乎在 3 分钟内达到 100%。随着 HO 和 KSO 浓度增加到 3 mM，氧氟沙星的降解速率加快，但随着 HO 过量（>3 mM），降解速率略有下降。在高碱性条件（pH 11）下，改良 VUV 工艺（即 VUV/HO 和 VUV/KSO）的性能受到抑制。卤化物（Cl 和 Br）的共存通过改良的 VUV 工艺增强了抗生素的降解，但在单一卤化物存在下，反应几乎不受影响。本研究表明，改良的 VUV 工艺（尤其是 VUV/KSO）可有效去除水中的氟喹诺酮类抗生素，可作为处理含抗生素工业废水的清洁绿色方法。
