二硫化钼负载泡沫镍铁电极降解水中氟苯尼考的研究

Degradation of florfenicol in water by MoS_(2)loaded foam Ni-Fe electrode

以二硫化钼(MoS_(2))为载体,通过水热法负载泡沫镍铁制备MoS_(2)负载泡沫镍铁电极(MoS_(2)@Ni-Fe-Foam)并用于降解水中的氟苯尼考(FLO)。利用X-射线衍射仪(XRD)、扫描电子显微镜(SEM)和X-射线光电子能谱仪(XPS)对电极的表面形貌和元素分布进行表征,采用循环伏安法和电化学阻抗谱对其电化学性能进行表征,通过电子顺磁共振检测(EPR)、高效液相色谱-三重四极杆质谱仪、离子色谱及电化学检测研究了不同条件对FLO降解效果的影响,并对降解产物和降解机理进行了分析。结果表明,当FLO质量浓度为25 mg/L、电流密度为30 mA/cm^(2)、初始pH为3、Na_(2)SO_(4)浓度为30 mmol/L时对FLO的降解速率最快,降解率达到96%。自由基淬灭实验表明,·O_(2)^(-)在降解过程中发挥主要作用,其次是^(1)O_(2),而·OH的影响较弱。最后,通过三重四极杆质谱仪分析得到4种FLO降解产物,并提出FLO的降解机理。

Taking molybdenum disulfide(MoS_(2))as a carrier,MoS_(2)loaded foam nickel-iron electrode(MoS_(2)@Ni-Fe-Foam)is prepared through the hydrothermal method,and used for the degradation of florfenicol in water.The surface morphology and element distribution of the electrode are characterized by means of X-ray diffractometer(XRD),scanning electron microscope(SEM)and X-ray photoelectron spectrometer(XPS),and the electrochemical performance is characterized by means of cyclic voltammetry and electrochemical impedance spectroscopy.The effects of different conditions on the degradation efficiency of florfenicol are studied by using electron paramagnetic resonance detection(EPR),high performance liquid chromatography-triple quadrupole mass spectrometer,ion chromatography,and electrochemical detection.The products obtained from degradation and the degradation mechanism are analyzed.It is shown by the results that the degradation rate of florfenicol reaches the fastest,96%when the mass concentration of florfenicol is 25 mg·L^(-1),current density is 30 mA·cm-2,initial pH is 3,and Na_(2)SO_(4)concentration is 30 mmol·L^(-1).It is indicated by free radical quenching experiments that·O_(2)^(-)plays a major role in the degradation process,followed by^(1)O_(2),while·OH has a relatively weak influence.Finally,four products obtained from degradation are identified by triple quadrupole mass spectrometer,and the degradation mechanism of florfenicol is proposed.