Study On Preparation And Properties Of Graphene-and Graphene Analogues-based Photocatalysts

With the rapid development of today’s society and all of countries in the world, theadvance of science and technology, industry and agriculture, as well as the improvementof people’s living quality, the energy crisis and environment pollution have been twoglobal major issues, currently. The development of semiconductor photocatalyticdegradation of organic pollutants can not only make full use of the huge, pollution-free,renewable and safe solar energy to achieve the goal of saving energy, but alsoeffectively photodegrade the organic pollutants to achieve the goal of environmentprotection. In this article, in order to improve the performance of semiconductorphotocatalyst, we chosed the graphene and graphene analogues materials to buildternary heterostructured composites, and investigated their properties in photocatalyticfield.The dual heterostructured composite Bi2MoO6/Bi3.64Mo0.36O6.55was prepared by afacile hydrothermal method under a certain pH value. Based on it, we introducedgraphene oxide obtained by a chemical oxidation into the reaction system and prepareda composite graphene-Bi2MoO6/Bi3.64Mo0.36O6.55through a hydrothermal method.According to XRD, SEM and TEM analysis, it can be found that, in a certain range, theadditonal amount of graphene oxide has effects on the relative content of Bi2MoO6andBi3.64Mo0.36O6.55, structure and morphology of the composite. Based on the results ofFT-IR, XPS, and Raman, it can be concluded that graphene oxide in the composite hasbeen reduced to graphene after hydrothermal reduction, and the graphene is bondedtightly together with Bi2MoO6/Bi3.64Mo0.36O6.55through chemical bond. We evaluate thephotocatalytic performance of as-prepared composite was evaluated by degrating theRhB and2,4-dichlorophenol under visible light irradiation.Graphene-Bi2MoO6/Bi3.64Mo0.36O6.55exhibits a better efficient photocatalyticperformance and good stability. And the optimal loading amount is1wt%. Finally, thereasonable formation mechanism and photocatalytic mechanism of the composite hasbeen put forward.In addition, we explore the synthesis condition of Bi2WO6/Bi3.84W0.16O6.24, andthen combined the few-layer WS2with graphene-like structure with the as-synthesizedBi2WO6/Bi3.84W0.16O6.24to obtain a ternary heterostructured composite photocatalystWS2-Bi2WO6/Bi3.84W0.16O6.24through a hydrothermal method. According to results ofXRD, TEM, EDS and Raman, it can provide evidences for the exsitence of three kind of phase, and the successful exfoliation from bulk to few-layer WS2. Compared with the ofBi2WO6/Bi3.84W0.16O6.24and bulk WS2-Bi2WO6/Bi3.84W0.16O6.24, the few-layerWS2-Bi2WO6/Bi3.84W0.16O6.24show a better photodegradation performance due to theunique physcial and chemical properties of few-layer WS2. This is the first report on theapplication of few-layer WS2to the preparation of composite photocatalyst, which makesome progress and laid a solid foundation for the applied promotion of grapheneanalogues materials in the field of photocatalytic technology.