The Synthesis Of M_xO_y?M=Sn,Co,Fe,Zn? With F Co-modified Anatase TiO₂ Nanosheets And Their Performance For Photocatalytic

The increase of industrialization and urbanization leads to several serious environmental problems around the world.Clean water is indispensable to the survival of all living things on earth,but water pollution has become increasingly serious in recent decades.Pollutants have become a major threat to clean water in aqueous solutions for long-term time.Organic dyes and heavy metals in pollutants seriously endanger public health.Among many water treatment methods,photocatalysis in AOPs is a kind of "green" technology to deal with pollutants.TiO2 has the advantages of low cost,"green" and high stability,but has the disadvantages of wide bandgap and low quantum efficiency.In this paper,the anatase F-TiO2 nanosheets with co-exposed {001} and {101}surfaces were acted as the substrate material,and their size was adjusted by adding different metal oxides MxOy(M=Sn,Co,Fe,Zn).XRD,SEM,EDS,TEM,XPS,BET,UV-vis and PL were used to detect and characterize the composition,microstructure,specific surface area and pore diameter,optical absorption characteristics and photoluminescence of the prepared materials.After the samples were characterized and their photocatalytic properties were tested,the main research results were obtained:(1)Anatase F-TiO2 nanosheets with co-exposed {001} and {101} surfaces were synthesized by solvent thermal method,and its photocatalytic performance is superior to traditional P25 nanomaterials.It is mainly attributed to the formation of "surface junctions" on the surface of TiO2 by the {001} and {101} surfaces,which contributes to the transfer and separation of electrons and holes.(2)The introduction of different metal oxides MxOy(M=Sn,Co,Fe,Zn)not only effectively reduces the size of F-TiO2 nanosheets,but also forms a mesoporous material with a large specific surface area.(3)At the range of ??400 nm,in terms of photocatalytic oxidation of MB(10 mg/L),Co3O4-F-TiO2 degrade MB within 30 min and its ORMB value reaches 0.016,which is superior to SnO2-F-TiO2?Fe2O3-F-TiO2 and ZnO-F-TiO2;in terms of the performance of photocatalytic reduction Cr(?)(10mg/L),ZnO-F-TiO2 reduction Cr(?)within 180 min at neutral condition and its RRcr(?)value reaches 0.002,which is superior to SnO2-F-TiO2?Co3O4-F-TiO2 and Fe2O3-F-TiO2.