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Synthesis And Performance Study Of Porous Boron Nitride Composites

Posted on:2021-01-22Degree:MasterType:Thesis
Country:ChinaCandidate:S HeFull Text:PDF
GTID:2381330602995887Subject:Atomic and molecular physics
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Porous boron nitride is a new-type inorganic non-oxide porous material with structural and properties analogy with graphite.Just like other porous materials,porous boron nitride has high specific surface area and large pore volume.Because of its fine thermal stability,chemical inertness and structural stability,it is one of the excellent support materials.Even at high temperature,its chemical and physical properties remain unchanged.Due to its many unique properties,make it a promising candidate for applications in various fields such as catalysis,loading and water purification.In this paper,some problems existing in water treatment of porous boron nitride are improved,and the application of porous boron nitride as a supporter of fluorescent materials is investigated due to its high thermal conductivity.The specific contents are as follows:?1?Three-dimensional porous boron nitride nanosheets with enhanced adsorption capacity for cationic dyes were synthesized by a template-free route,using ethylenediamine as solvent and nitrogen source,and B2O3 as boron source.By using XRD,SEM,TEM,DFT,TG,UV-vis and other methods to characterize the physical properties of three-dimensional porous boron nitride nanosheets,and study its microstructure,crystal and pore structure.In addition,methylene blue?MB?was used as a simulated pollutant to study the water treatment performance of the three-dimensional porous boron nitride nanosheets.The results indicate that the as-prepared three-dimensional porous boron nitride nanosheets has excellent adsorption ability for MB in aqueous solution:under the condition of 30oC and p H8.0,more than 95.3%dyes were removed in 5 minutes,which showed broad application prospect for water treatment.?2?In this paper,?-Fe2O3 and porous boron nitride??-Fe2O3/PBN?water purification composites were prepared via a simple two-step synthetic route.The structure and morphology of the composites were characterized,and the results show that?-Fe2O3 nanoparticles were uniformly dispersed on the surface of PBN.Regeneration performance was measured by adsorption and regeneration experiments,the results indicate that?-Fe2O3 nanoparticles loaded on PBN exhibited excellent synergistic catalytic degradation activity with the assistance of H2O2 toward methylene blue?MB?adsorbed on PBN's surface,so that the composites can still maintain good adsorption performance.?3?Rhodamine B?Rh B?,an organic fluorescent dye,was successfully introduced into porous boron nitride nanosheets to prepare rare-earth free light composite conversion materials.XRD and PL spectroscopy were used to investigate the optical properties and stability of these composites.The results showed that the composite phosphors exhibited more excellent optical properties and stability for Rh B in aqueous solution.Besides,the composite phosphors possessed greatly improved service life because of the high thermal conductivity of PBN nanosheets.In addition,the composites had a broad visible emission wavelengths under the excitation of 363nm light.
Keywords/Search Tags:porous boron nitride, water purification composites, regeneration, rare-earth phosphors
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