Research On The Properties Of Bismuth-based Catalysts In Low Surface Energy Materials

Superhydrophobic functional materials can effectively solve the problem of marine pollution caused by crude oil leakage and are often used in ecological restoration of water system.Superhydrophobic materials synthesized by constructing surface roughness and reducing surface energy have practicability in fog prevention,anti-icing,drag reduction,corrosion resistance and oil-water separation.But for water pollution,the existence of water-soluble aromatic dyes is harmful to the ecological environment and human health.Utilizing the active species generated in the photocatalytic reaction process,redox reaction can occur with organic dyes to produce water,carbon dioxide and other inorganic components.In this thesis,bismuth-based catalysts with high catalytic activity are introduced into low surface energy materials,the single functional superhydrophobic technology is combined with photocatalytic technology to prepare functional composite materials with oil-water separation ability and visible light response.The main research contents are as follows:1.Z-type BiOI/CdS semiconductor catalyst and ZIF-8 with zeolite imidazolid structure were grown onto the three-dimensional skeleton of melamine sponge（MS）by solvothermal method.The superhydrophobic BiOI/CdS/ZIF-8 melamine sponge（SHBCZ MS）was prepared by immersing the ethyl acetate solution of polydimethylsiloxane（PDMS）to enhance the binding force between the nanoparticles and the substrate,as well as lower the surface energy.The superhydrophobic 3D material can adsorb oil phase in the oil-water mixture and has excellent photocatalytic performance.2.BiOBr polyurethane sponge（PU）with three-dimensional macroporous structure was prepared by in-situ polymerization of BiOBr catalyst into the reaction system after pre-polymerization.By contrast photocatalytic experiments,it was confirmed that when the BiOBr incorporation amount was 3 g（PU-3）,the degradation performance was the best.Superhydrophobic BiOBr polyurethane aerogel（SHPU-3）was prepared by surface modification with polydivinylbenzene（PDVB）.SHPU-3 is an excellent oil phase adsorbent with high oil absorption rate.Under the excitation of xenon lamp and outdoor light,it has intense photocatalytic activity and stable cyclic degradation performance.3.The superhydrophobic Bi₂MoO₆（SHBM）fabric was prepared by solution deposition of Bi₂MoO₆ catalyst and hydrophobic SA-ZnSnO₃ nanoparticles on the fiber fabric.Thereinto,SA-ZnSnO₃ nanoparticles were synthesized with the zinc source provided by the metal-organic framework material ZIF-8 and the hydrophobic modification of stearic acid.SHBM fabric has excellent cyclic degradation stability,which can be reused several times and provides an effective strategy for the recovery of powder catalyst.Its preeminent superhydrophobic properties can achieve efficient skimming in sewage.