Study On The Preparation Of Bismuth-based Photocatalysts By Electrospinning And Their Properties

The core of photocatalysis technology is the development of highly efficient,stable and easily recoverable photocatalysts.The nanofiber photocatalyst prepared by electro spinning has a large specific surface area,high photocatalytic activity,and is easy to recover.The bismuth-based photocatalyst has excellent photocatalytic performance under visible light irradiation,and has good characteristics conducive to sewage degradation and environmental purification.Bismuth vanadate(BiVO4)and bismuth molybdate(Bi2MoO6)are very promising visible light driven semiconductor photocatalysts,which have many advantages,such as low production cost,low toxicity,high photo stability,and good light corrosion resistance.In this study,a composite photocatalyst was prepared by electro spinning,and its photocatalytic performance was characterized by various methods.The photocatalytic reaction was used to evaluate the degradation ability of the composite material to simulated pollutants in water.The research of this paper is mainly divided into three parts:A variety of bismuth vanadate(BiVO4)/carbon nanofiber(CNF)composite photocatalysts were prepared by adjusting the concentration of BiVO4 precursor solution by combining electrospinning and solvent heat.A series of characterization analyses were performed on the phase structure,surface morphology,and light absorption characteristics of the prepared composite photocatalyst by X-ray diffraction(XRD),scanning electron microscope(SEM),and ultraviolet-visible diffuse reflectance spectroscopy(DRS).The organic dye Rhodamine B was used as a simulated pollutant to evaluate its photocatalytic performance.The experimental results show that when the concentration of the reaction precursor solution is 5.0 mmol/L,the effective separation rate of the photo-generated carriers driven by the light-induced potential difference generated at the interface of the BiVO4/CNF heterojunction composite material is the highest,and it degrades Rodin under visible light irradiation Ming B has the best photocatalytic performance,and its degradation rate can reach 99.0%within 160 min.A combination of electro spinning and solvothermal method,using Bi2MoO6 as the precursor solution,by adjusting the concentration of Bi2MoO6 precursor solution,prepared a variety of morphologies of Bi2MoO6/PA66 composite photocatalyst,and carried out a series of characterization Analysis instructions.The results show that when the concentration of the Bi2MoO6 precursor solution is 1.0 mmol/L,the composite photocatalyst has the best morphology.It can be seen that the Bi2MoO6 nanosheets are evenly loaded on the PA66 nanofiber membrane.Under visible light irradiation,the rhodamine B solution is degraded The performance is the best,and the degradation rate is 98.9%within 120 minutes.The method of combining electrospinning and solvent heat is adopted to synthesize CQDs/Bi2MoO6/PA66 composite photocatalyst with different mass ratio by adjusting the dosage of CQDs.A series of characterization analysis and description of CQDs modified Bi2MoO6/PA66 materials were carried out.The photocatalytic activity was fully studied through photodegradation experiments.Under visible light irradiation,it was observed that CQDs modified Bi2MoO6/PA66 nanofiber membrane samples had a higher degradation rate of rhodamine B(RB)than Bi2MoO6/PA66.When the Bi2MoO6 photocatalyst was modified with 5wt%CQDs,the composite photocatalyst showed the best photocatalytic activity.This improvement is attributed to the addition of CQDs to increase the separation and transfer rate of photogenerated charges,thereby improving the photocatalytic performance.