Preparation Of （Fe）CoNi/g-C₃N₄ Three-Dimensional Particles And Electro-Fenton-Catalyzed Degradation Of Quinoline

Quinoline is a typical nitrogen-containing heterocyclic compound with carcinogenic,teratogenic and mutagenic effects on living organisms,which is difficult to be degraded by direct biological treatment.As an efficient and green industrial wastewater treatment method,three-dimensional particle electro-Fenton advanced oxidation method has unique advantages in the field of wastewater treatment.In the paper,two NiCo₂S₄/g-C₃N₄and FeCo NiP/g-C₃N₄particle catalytic electrodes with high catalytic activity and low cost were prepared using quinoline as the simulated target pollutant and characterized by scanning electron microscopy（SEM）,X-ray diffraction（XRD）,pyridine infrared（Py-IR）and X-ray photoelectron spectroscopy（XPS）tests.The process conditions were optimized by single-factor experiments to determine the best reaction conditions for the degradation of quinoline wastewater.Liquid chromatography-mass spectrometry（HPLC-MS）was used to analyze and identify the intermediate products of quinoline degradation and determine the possible degradation pathways of quinoline.The main research results are as follows:（1）NiCo₂S₄/g-C₃N₄and FeCo NiP/g-C₃N₄particles were prepared as particle electrodes and applied in an electrochemical reactor to construct a three-dimensional particle electro-Fenton system,and the NiCo₂S₄/g-C₃N₄and FeCo NiP/g-C₃N₄catalytic particles were characterized by XRD,SEM,TEM,XPS and Py-IR.（2）When NiCo₂S₄/g-C₃N₄was used as the catalytic particle electrode,the optimal degradation conditions were:reaction time of 30 min,NiCo₂S₄/g-C₃N₄particle dosage of 60 g/L,p H of 3,H₂O₂concentration of 71.2 mmol/L,conductivity of 12.1 ms/cm and current density of 41.66 m A/cm².The quinoline removal rate was up to 95.60%.（3）When FeCo NiP/g-C₃N₄particles were used as catalytic particle electrodes,the optimal degradation conditions were:reaction time of 30 min,FeCo NiP/g-C₃N₄patticle dosage of 50 g/L,p H of 3,H₂O₂concentration of 75.6 mmol/L,conductivity of 11.5 ms/cm and current density of 37.04 m A/cm².The quinoline removal rate could reach 90.95%.（4）To determine the important role of hydroxyl radicals in the electrochemical process,electron paramagnetic reaction（EPR）and radical scavenging experiments were performed.The intermediates produced during quinoline degradation were also identified by high performance liquid chromatography-mass spectrometry（HPLC-MS）,and two possible degradation pathways were proposed.