The Preparation Of Catalysts Supported On Bi₂O₂CO₃ And The Study Of Their Photocatalytic Performance For Organic Reactions

Bi₂O₂CO₃ is a new type of semiconductor material,which is widely used in photocatalysis due to its unique structure and property.In this paper,a series of Z-scheme Ag3PO4/Ag/Bi₂O₂CO₃ catalysts with different amount of Ag3PO4/Ag loadings and Ag-Pt/Bi₂O₂CO₃ catalysts are prepared.The morphology,structure,and valence state of the photocatalysts are characterized by SEM?TEM?XRD?UV-vis DRS?XPS and BET etc.Finally,the photocatalytic activities of two kinds of catalysts in organic synthesis reaction were investigated.The results are shown as follows:?1?Bi₂O₂CO₃ carrier was prepared by hydrothermal method and Ag3PO4/Ag/Bi₂O₂CO₃ catalysts were prepared by deposition-precipitation method.UV-vis DRS results indicate that the catalysts have a wide and strong absorption peak in the visible light range.TEM results show that Ag3PO4 and Ag nanoparticles are dispersed well and are uniformly distributed on the surface of Bi₂O₂CO₃ in the form of spherical particles,XPS results show that Ag nanoparticles exist in metallic state and ionic form.In summary,Ag3PO4 and Ag nanoparticles are successfully loaded on Bi202C03.?2?The catalytic activities of the oxidative esterification of aldehydes and alcohols,alcohols and alcohols,and coupling reactions of imines are superior on Ag3PO4/Ag/Bi₂O₂CO₃?71wt%?.The effects of different kinds of solvents,bases and their amounts,catalysts and their amounts,different amounts of reactants and different reaction atmospheres on the reactions are investigated.The best conversion is over 90%.?3?Under the optimum reaction conditions,the activities of different alcohol derivatives and amine derivatives are detected.The effects of different light intensities and wavelengths on the esterification reaction of benzaldehyde and alcohol are performed.The recyclability of the catalysts is investigated,too.The higher the light intensity is,the higher the conversion is.And the stability of the catalyst is good after 6 reusing,which conversion is over 80%.Finally,a possible photocatalytic mechanism for the esterification reaction of benzaldehyde and alcohol over Ag3PO4/Ag/Bi₂O₂CO₃ photocatalysts is proposed.?4?Bimetallic Ag-Pt/Bi₂O₂CO₃ photocatalysts are prepared by NaBH₄ reduction method and then are characterized.The photocatalytic activities for the a-alkylation reaction of alcohols and ketones are detected on Ag-Pt/Bi₂O₂CO₃.Bi₂O₂CO₃ with a large specific surface area in the Ag-Pt/Bi₂O₂CO₃ catalyst is favorable for the reaction of ?--alkylation,and the catalytic activity is the best when the Ag-Pt ratio is 2.5:0.5,whose conversion and selectivity is 78.3%and 95.2%,respectively.