Fe^(0)/FeS_(2)活化H_(2)O_(2)快速降解诺氟沙星  

Rapid degradation of norfloxacin by Fe^(0)/FeS_(2)activated H_(2)O_(2)

作　　者：陈铃 华洁 何诗语 吕源财[1] 刘明华[1,2] CHEN Ling;HUA Jie;HE Shiyu;LYU Yuancai;LIU Minghua(College of Environment and Safety Engineering,Fuzhou University,Fuzhou 350116,China;College of Environmental and Biological Engineering,Putian University,Putian 351100,China)

机构地区：[1]福州大学环境与安全工程学院,福州350116 [2]莆田学院环境与生物工程学院,莆田351100

出　　处：《环境工程学报》2023年第9期2909-2920,共12页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金青年项目(51908132)。

摘　　要：通过水热法成功制备具有磁性的Fe^(0)/FeS_(2)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Fe^(0)/FeS_(2)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Fe^(0)/FeS_(2)复合材料的成功制备且具有良好的磁性。通过实验得到Fe^(0)/FeS_(2)/H_(2)O_(2)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),Fe^(0)/FeS_(2)投加量为0.2 g·L^(−1),H_(2)O_(2)质量浓度0.051 g·L^(−1)。Fe^(0)/FeS_(2)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^(−)、H_(2)O、CO_(2)和NO_(3)^(−)等。The magnetic Fe^(0)/FeS_(2)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 Fe^(0)/FeS_(2)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 Fe^(0)/FeS_(2)composite material had been successfully prepared with good magnetic properties.The results of NOF degradation experiments showed that the optimal conditions of Fe^(0)/FeS_(2)/H_(2)O_(2)system for norfloxacin degradation were initial pH=5,norfloxacin initial concentration of 20 mg·L^(−1),Fe^(0)/FeS_(2)dosage of 0.2 g·L^(−1),H_(2)O_(2)concentration of 0.051 g·L^(−1).The heterogeneous Fenton system could instantaneously degrade 99.27%of NOF in 10 min,and the Fe^(0)/FeS_(2)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^(−),H_(2)O,CO_(2)and NO_(3)^(−)will be generated.

关 键 词：Fe^(0)/FeS_(2) 过氧化氢 NOF 非均相芬顿 降解 

分 类 号：X703[环境科学与工程—环境工程]