Synthesis And Photocatalytic Properties Of Metal Phthalocyanine/(Tungsten,Molybdenum) Bismuth Nanocomposites

With the development of human society and economy,rapid economic progress has produced a large amount of organic industrial waste and garbage into the water,a large number of organic pollutants into the environment,seriously affecting the human environment and social development.As a result,the issue of water environment management has become increasingly important,and more and more researchers are focusing their research on water pollution treatment.Semiconductor photocatalytic technology is an environmentally friendly technology,recognized by the industry as one of the most effective technology to deal with water pollution,the technology efficient use of sunlight to effectively solve the water environment problems.Bi₂MO₆?M=W,Mo?materials have a unique Aurivillius laminar structure and a relatively suitable no-band width,but their relatively low solar utilization and photogenic electron cavity composites limit their practical application.Metal phthalocyanine is non-toxic,stable,good corrosion resistance,strong absorption in the long visible area of sunlight,in recent years,has been widely used in the field of photocatalysis,as a new type of photocatalyst.This thesis focuses on the structure of Bi₂MO₆?M=W,Mo?-based nanomaterials in combination with copper phthalocyanine?CuPc?,the preparation of Bi₂MO₆?M=W,Mo?-based heterostructured nanomaterials with one-dimensional shape using electrostatic spinning technique,followed by the preparation of novel photocatalysts by solvent-thermal method of loading copper phthalocyanine,and the specific discussion of its photocatalytic efficiency in terms of increased solar light utilization and restrained photogenic electron hole complexes.The main research contents of this paper are as follows:1. A novel photocatalyst of tetranitro copper phthalocyanine?TNCuPc?-sensitized CeO₂/Bi₂MoO₆ nanofibers?TNCuPc/CeO₂/Bi₂MoO₆?was prepared by electrospinning and solvothermal technology.In the photocatalytic test,the degradation efficiency of tetracycline of TNCuPc/CeO₂/Bi₂MoO₆ nanofibers to reached 94.2%.The photocatalytic test results show that this new type of photocatalyst has extremely strong photocatalytic performance.The unique one-dimensional structure solves the difficult problem of copper phthalocyanine separation after use.The TNCuPc enhances the utilization of sunlight.The heterostructure of CeO₂/Bi₂MoO₆ inhibits the recombination of photo-generated electron-hole pairs.The synergistic effect of TNCuPc,CeO₂ and Bi₂MoO₆ promoted the improvement of photocatalytic efficiency.2. A p-n heterojunction photocatalyst of NiO/Bi₂WO₆ nanotubes was prepared by electrospinning technology.The new photocatalyst was characterized by XRD,SEM,TEM and other data to measure the phase,structure and morphology.Under the visible light irradiation,the degradation efficiency of tetracycline reached 92.0%,and compared with the NiO and Bi₂WO₆ nanofibers,NiO/Bi₂WO₆ nanotubes showed excellent photocatalytic performance.The enhancement of photocatalytic efficiency is attributed to the existence of an internal electric field formed by the unique p-n heterostructure and the large specific surface area of the tubular structure can provide more active sites.In addition,NiO and Bi₂WO₆ have suitable band gap positions can inhibits recombination of photogenerated electron-hole pairs.The capture agent test found that the main radical group in the photocatalytic experiment of this system was·OH.Cyclic tests prove that the p-n heterojunction photocatalyst of NiO/Bi₂WO₆ nanotube is a perfect photocatalyst.3. In order to obtain a more efficient photocatalyst,we use solvothermal technology to load TNCuPc?TNCuPc/NiO/Bi₂WO₆?on the surface of NiO/Bi₂WO₆ nanofibers to form a ternary heterostructure.Through diffuse reflection analysis,the addition of TNCuPc greatly expanded the photo-response range of NiO/Bi₂WO₆ nanofibers photocatalysts under sunlight.The fluorescence data proved that the recombination efficiency of the photo-generated electron-hole pairs of the TNCuPc/NiO/Bi₂WO₆nanofibers was the lowest.TNCuPc/NiO/Bi₂WO₆ nanofibers exhibit the highest photocatalytic efficiency in the degradation of tetracycline ang 4-NP,cyclic experiments show that the photocatalysis has good reusability.4. TNCuPc/Bi₂MoO₆ heterostructure nanofibers were prepared by a combination of electrospinning and solvothermal technology.The prepared nanofibers are formed by supporting TNCuPc on Bi₂MoO₆ nanofibers.The photocatalytic degradation of rhodamine B and the photocurrent response tests have more accurately evaluated the photocatalyst.The results show that TNCuPc/Bi₂MoO₆ heterostructure nanofibers have enhanced photocatalytic performance.