The Performance Study Of Coupling Of Solar Photoelectro-fenton With A Palladium Gold Alloy And BiFeO₃/G-C₃N₄ Composites And Solar Heterogeneous Photocatalysis

With the rapid development of economic globalization,environmental issue has aroused wide attention because economic development is at the expense of energy consumption.Semiconductor photocatalytic,a new processing technology,can effectively tackle with environmental problems.However,conventional semiconductor materials represented by titanium dioxide?Ti O₂?have been difficult to achieve breakthrough progress in practical industrial applications,and just because of the narrow band-gap,the low utilization ratio of solar energy and the difficult solid-liquid separation.Electric Fenton technology is an advanced electro-catalytic oxidation technology developed in wastewater treatment applications in recent years.It gradually attracts attention because it can produce H₂O₂ in situ.BiFeO₃ is a new type of semiconducting material that has received extensive attention because of its narrow bandgap?2.2 eV?.In this paper,two kinds of materials with photocatalytic effect and electro-Fenton catalytic effect are prepared on the basis of iron-based metal oxides?BiFeO₃?.The structure,morphology and composition of the materials are studied by XRD,SEM,TEM and XPS and the characterization is carried out,and the degradation effects and degradation mechanisms of pollutants under photocatalytic and electro-Fenton catalysis and photo-electricity synergy are explored.The main research contents are as follows:1.The BiFeO₃ nanomaterials are prepared by the solvent-gel method,and the palladium-gold alloy is reductively loaded on the surface of the synthesized ferrite nanomaterials by chemical reduction method,and the photocatalysis is carried out using20 mg/L p-nitrophenol as the target contaminant.Electro-Fenton catalytic degradation and photoelectrocatalytic degradation.It is found that the photocatalysis in the simulated solar light is completely degraded in 40 minutes,providing a completely new method for the degradation of pollutants that are difficult to deal with environmentally.2.The g-C₃N₄/BiFeO₃ nanomaterials were synthesized by a one-step method,the palladium-gold alloys are successfully loaded on the surface of the g-C₃N₄/BiFeO₃nanomaterials by chemical reduction.Heterojunction structure can reduce the photo electron hole recombination rate and enhance the photocatalytic effect.The catalytic effect of Fenton and its influencing factors were investigated.The results shows that the electro-Fenton's catalytic effect will be the best under the condition that pH=3,the current intensity is 200 mA and 1 g of g-C₃N₄/BiFeO₃ palladium is loaded with 5 wt%.Photoelectrochemical degradation of 20 mg/L 4NP completely degraded in 30 minutes,which provides research ideas for how to improve the photoelectrocatalytic degradation of materials.