Fe0/FeS2活化H2O2快速降解诺氟沙星

通过水热法成功制备具有磁性的Fe⁰/FeS₂复合铁基催化剂，并将其用于构建非均相芬顿体系降解典型的喹诺酮类抗生素(诺氟沙星，NOF)。SEM-Mapping 结果显示，制备的Fe⁰/FeS₂复合材料由Fe和S两种元素组成，形态为颗粒状且尺寸不一。XRD、XPS、Raman和磁学测量系统(VSM)等表征结果表明进一步证明Fe⁰/FeS₂复合材料的成功制备且具有良好的磁性。通过实验得到 Fe⁰/FeS₂/H₂O₂体系降解NOF最优的降解体系为初始pH为5，NOF起始质量浓度20 mg·L⁻¹，Fe⁰/FeS₂ 投加量为0.2 g·L⁻¹，H₂O₂质量浓度0.051 g·L⁻¹。Fe⁰/FeS₂介导的非均相芬顿体系可以快速降解NOF，10 min后的降解率为99.27%，且具有良好的重复利用性，使用 3 次后，NOF 的降解效率仍超过75%。NOF在羟基自由基(·OH)的作用下可能破坏C-F键以及实现哌嗪环和喹诺酮环的开环，最终生成一些小分子物质，如 F⁻、H₂O、CO₂和NO₃⁻等。

Rapid degradation of norfloxacin by Fe0/FeS2 activated H2O2

The magnetic Fe0/FeS2 composite iron-based catalyst was successfully prepared by hydrothermal method, and was employed to mediate a heterogeneous Fenton system for the remediation of a typical Fluoroquinolones antibiotic (norfloxacin, NOF). The SEM-Mapping results showed that the Fe0/FeS2 composite was composed of Fe and S elements, and displayed granular structure with different sizes. The characterization results of XRD, XPS, Raman and Magnetic Measurement System (VSM) showed that the Fe0/FeS2 composite material had been successfully prepared with good magnetic properties. The results of NOF degradation experiments showed that the optimal conditions of Fe0/FeS2/H2O2 system for norfloxacin degradation were initial pH=5, norfloxacin initial concentration of 20 mg·L−1, Fe0/FeS2 dosage of 0.2 g·L−1, H2O2 concentration of 0.051 g·L−1. The heterogeneous Fenton system could instantaneously degrade 99.27% of NOF in 10 min, and the Fe0/FeS2 exhibited a good reusability. After 3 runs, the degradation efficiency of NOF was still over 75%. Under the attack of ·OH, norfloxacin may break the C-F bond and open the ring of piperazine and quinolone, and finally small molecular substances such as F−, H2O, CO2 and NO3− will be generated.