Preparation Of Dual-reaction Center Fenton-like Catalyst CN-Cu(?)-CuAlO₂ And Its Degradation Of Bisphenol A

Bisphenol A is widely used in the plastics industry,because its widespread use has already caused some pollution to water bodies,as an endocrine interferon,it can cause serious harm to both humans and animals through the enrichment of the food chain.However,it is difficult to remove by conventional water treatment processes,Fenton catalytic technology is an effective treatment method.Due to the current problems of poor catalytic activity,poor catalyst stability and low H2O2 utilization under heterogeneous Fenton-like catalysts,it is necessary to conduct in-depth research on heterogeneous Fenton-like catalysis and catalyst improvement.In this study,the composite material CN-Cu(?)-CuAlO2 was synthesized by two-step high-temperature calcining,the morphology and structure of the material were studied by various kinds characterization methods,such as X-ray diffraction scanning,electron microscopy,transmission electron microscopy,Fourier infrared conversion spectrometry,functional theory calculation et al.The analysis results showed that a chemical reaction during the organic ligand binding of CuAlO2,with a large number of Cu2+ generated on the catalysts surface.The ligand fonned on the surface of C elements largely replaced N elements,but g-C3N4 basic framework was unchanged.The organic ligand CN and CuAlO2 were connected through special bond bridge Cu-O-C.By EPR and density functional theory calculations,confirmed that the enrichment of a large number free electrons around the C.u atoms,Cu atoms formed rich-electron reaction centers,and in the CN aromatic ring of the electrons of the C atoms loss is bigger,therefore in the C atoms formed poor-electron reaction centers,and the free electron on CN-Cu(?)-CuAlO2 transfers the free electron at C atom to Cu atom via Cu-O-C.CN-Cu(?)-CuAlO2 was used to degrade BPA in water.Under the same experimental conditions,the degradation rate of CN-Cu(?)-CuAlO2 to BPA was 45 and 25 times that of g-C3N4 and CuAlO2,respectively,it also has a higher utilization ratio for H2O2.A series of characterization confirmed that in the reaction,organic pollutants mainly reacted with the poor-electron center C site on the catalyst surface,which was stripped of free electrons and oxidized,while H2O2 obtained electrons at the Cu site and was reduced to produce·OH.After six cycle tests,the removal rate of BPA remained above 90%,indicating that the catalyst is stable instructure and has good stability of catalytic activity.The catalyst prepared in this study breaks through the deficiency of traditional fenton catalyst in theory and has high removal effect on a variety of organics,providing some new ideas for the development of heterogeneous Fenton-like catalytic technology.