College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China.
College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China.
Chemosphere. 2017 Sep;182:306-315. doi: 10.1016/j.chemosphere.2017.05.035. Epub 2017 May 6.
The degradation of antibiotic levofloxacin was investigated by dimensionally stable anode as well as modified cathode using low-cost chemical reagents of hydrazine hydrate and ethanol for electro-Fenton in an undivided cell at pH 3.0 under room temperature. Comparison of unmodified and modified cathode was performed. The apparent rate constant of levofloxacin decay was found to be 0.2883 min for graphite felt-10 with the best performance at 200 mA, which is lower than graphite felt at 400 mA. The optimum modified cathode showed a significant improvement of complete mineralization of levofloxacin, reaching a 92% TOC removal at 200 mA for 480 min higher than unmodified one at twice the current. Surface physicochemical properties and morphology were investigated by scanning electron microscope, contact angle and X-ray photoelectron spectroscopy. The electrochemical characterization of hydrogen evolution reaction was adopted to clarify a possible pathway for the higher mineralization of levofloxacin, indicating a potential pilot-scale study to the pollution with the similar structure.
采用肼和乙醇等低成本化学试剂，在室温下 pH 3.0 条件下，在未分隔的电池中使用尺寸稳定的阳极和改性阴极研究了抗生素左氧氟沙星的降解。对未改性和改性阴极进行了比较。在 200 mA 时，石墨毡-10 的性能最佳，左氧氟沙星衰减的表观速率常数为 0.2883 min，低于 400 mA 时的石墨毡。最佳改性阴极显著提高了左氧氟沙星的完全矿化，在 480 min 内以 200 mA 的电流达到 92%的 TOC 去除率，高于两倍电流下的未改性阴极。通过扫描电子显微镜、接触角和 X 射线光电子能谱研究了表面物理化学性质和形态。采用析氢反应的电化学特性来阐明左氧氟沙星的更高矿化途径，表明对类似结构的污染具有潜在的中试研究意义。
