Study On Solution-phase Preparation And Photocatalyst Property Of Sillenite-Type Micro/Nano Materials

The development of efficient sillenite photocatalytic materials has important scientific significance and practical value for solving environmental problems.However,the reported sillenite photocatalysts usually have small specific surface area and poor charge separation efficiency due to its structure and functional defects,which lead to the bad photocatalytic activity.Based on the mild solution-phase synthesis approach,water-soluble surfactant with high viscosity will be adopted to regulate the reaction rate and induce the self-assembly of nano-units,resulting in the formation of Bi12MO20-x(M = Ge?Si?P?Fe?Zn?W)hierarchical structures with a large specific surface area.Corresponding hierarchical heterogeneous photocatalysts will be constructed by means of selective modification technologies including semiconductor composition,noble metal loading and carbon coating,which favor of the efficient separation of photo-generated charge.Based on the photocatalytic degradation tests of Rhodamin B,the influence of the microstructure on the photocatalytic efficiency,charge separation and transfer will be explored with the help of spectral analyses and XRD.Essential factors of the high photocatalytic activity will be proposed.This project will enrich the preparation technology of sillenite materials,and provide new research ideas for the development of new photocatalytic materials.In this paper,the following conclusions:1.Researchers by mild hydrothermal synthesis approach prepared Bi12SiO20 microcubies,and the morphology and structure were characterized by the X-ray powder diffraction(XRD),scanning electron microscope(SEM),energy spectrum(EDS)and high resolution transmission electron microscopy(HRTEM)and X-ray photoelectron spectroscopy(XPS),at the same time,the degradation process of rhodamine B in visible light and the photocatalytic mechanism have carried on the detailed research.2.Researchers based on the design of the heterojunction theory,prepared successfully a novel Bii2ZnO20-Bi2WO6 photocatalyst heterojunction by hydrothermal synthesis method,Bi2WO6 for Bi source preparation in advance,through transfer part controlled precipitation method prepared a novel Bi12ZnO20-Bi2WO6(BZO-BWO)heterojunction photocatalyst.In order to study photocatalytic properties of the BZO-BWO,under the irradiation of visible light,rhodamine B(RhB)dye for simulation dye,the research on the degradation efficiency of dye,and the catalytic mechanism was studied.3.The researchers used mild hydrothermal method,though some precipitation successful transformation,preparation of a novel Bi12TiO20-Bi2WO6(BTO-BWO)heterojunction photocatalyst.Photocatalytic experiment showed that Bi12TiO20-Bi2WO6 heterojunction degradation of RhB with ultra high photocatalytic activity under the radiation of ultraviolet-visible.Finally,in this paper,the photocatalytic mechanism the photoproduction charge separation process were discussed and analyzed.