Preparation And Properties Of Molecularly Imprinted Bismuth-based Photocatalytic Materials

Photocatalytic technology is a new type of advanced oxidation technology,which has the advantages of environmental friendliness,low operating cost,small secondary pollution and excellent stability.It has been widely used in the industrial field.Among many inorganic photocatalytic materials,bismuth-based photocatalytic materials have become one of the research hotspots of new photocatalytic materials due to their unique electronic structure,excellent visible light absorption performance and efficient and stable catalytic performance.However,their application is limited due to the lack of selective degradation performance.In this paper,three molecularly imprinted bismuth-based photocatalytic materials were prepared,and their selective degradation properties of pyridine in simulated oil were studied respectively,which broadened the application range of bismuth-based photocatalytic materials.The specific research contents are as follows:（1）The precursor Bi₂Mo O₆/Bi-BTC was synthesized by hydrothermal synthesis method,and the Bi₂Mo O₆/Bi₂O₃heterojunction material was prepared by calcining the precursor at high temperature.Then the molecularly imprinted photocatalyst PPY/Bi₂Mo O₆/Bi₂O₃was prepared by molecular imprinting technique,and characterized by XRD,SEM,FT-IR,etc.The optimum conditions for the selective degradation of pyridine in simulated oil were discussed,and the photocatalytic degradation mechanism was proposed.The experimental results show that when the concentration of pyridine in the simulated oil is 60μg/g,the amount of photocatalyst is 1.6 g/L,and the illumination time is 150 min,the selective degradation rate of pyridine can reach 85%.After PPY/Bi₂Mo O₆/Bi₂O₃was reused for five times,the degradation rate of pyridine in simulated oil was still as high as 82%.（2）The Bi₂O₃/CeO₂heterojunction was prepared by high-temperature calcination and oxidation.Finally,the molecularly imprinted photocatalyst POPD/Bi₂O₃/CeO₂was prepared by surface imprinting technique.The POPD/Bi₂O₃/CeO₂was characterized by XRD,SEM,FT-IR,etc.The optimum conditions for the selective degradation of pyridine in simulated oil were discussed,and the photocatalytic degradation mechanism of pyridine in simulated oil was proposed.The experimental results show that when the concentration of pyridine in the simulated oil is 80μg/g,the amount of photocatalyst is 1.6 g/L,and the illumination time is120 min,the degradation rate of pyridine can reach 80%.After POPD/Bi₂O₃/CeO₂was reused for five times,the degradation rate of pyridine in simulated oil was still as high as 80%.（3）The GO/BiOCl nanocomposites were prepared by hydrothermal synthesis method,and then the GO/BiOCl/Bi₂S₃composite photocatalyst was synthesized in situ.The molecularly imprinted photocatalyst PANI/GO/BiOCl/Bi₂S₃was prepared by surface imprinting technique.The samples were characterized by XRD,SEM,FT-IR,etc.The optimum conditions for the selective degradation of pyridine in simulated oil were discussed,and the photocatalytic degradation mechanism of pyridine in simulated oil was proposed.The experimental results show that when the concentration of pyridine in the simulated oil is 80μg/g,the amount of photocatalyst is 1.6 g/L,and the illumination time is 150 min,the degradation rate of pyridine in the simulated oil can reach 90%.After PANI/GO/BiOCl/Bi₂S₃was reused for five times,the degradation rate of pyridine in simulated oil was still as high as88%,showing good reusability.