Study On The Functionalization Of Hexagonal Boron Nitride

Hexagonal boron nitride(h-BN)is a typical 2-dimension material and possesses unique properties,including excellent chemical and thermal stability,high thermal conductivity and superior mechanical strength.Thus,h-BN finds wide applications as refractory ceramics,thermal conductive composites and electronic packing materials.Interestedly,the property of h-BN is strongly dependant on its microstructure.Therefore,it is of great significance for h-BN to extend its applications through microstructure modulation.In this work,several BN-based nanomaterials,such as C-h-BN,AgNP@BN and BN/?-SnWO4 were obtained by doping or combination technique.Furthermore,these functionalized h-BN materials were applied in environmental field,such as adsorbent,antibacterial agent and photocatalyst.The research contents are described as follows:(1)The C-doped h-BN(C-h-BN)was prepared by one-step calcination under reducing atmosphere.The samples were characterized by XRD,TEM and BET.The adsorption property of C-h-BN materials was investigated using Rhodamine B as a target.It was experimentally evidenced that the C-h-BN nanomaterial has favorable adsorption activity.The best adsorption ability was achieved at pH of 6 and its adsorption capacity was 165.3 mg/g.The fitting results suggested that the adsorption is mainly dominated by chemical adsorption and is a monolayer adsorption.(2)AgNP@BN nanocomposites were in-situ synthesized by a one-step calcination process.The samples were characterized by XRD,FT-IR and TEM.It was found that silver nanoparticles were coated by boron nitride nanosheets with porous structure.AgNP@BN nanocomposites showed superior antibacterial performance.The antibacterial ratio towards E.coli is over 99.9%.In addition,such a material exhibited excellent ability of discoloration-resistance.No significant deterioration was observed after 3 months storage.(3)h-BN/?-SnWO4 heterostucture was prepared by hydrothermal method.The degradation efficiency of methyl orange over BN-SW-0.5 was 94.74%within 90 minutes under the visible light irradiation.The h-BN can efficiently trap photo-excited holes through electron-donor functional groups and accordingly facilitate the separation of electron-hole pairs in ?-SnWO4.As a result,the photocatalytic property of BN/?-SnWO4 compound was improved.In summary,several h-BN-based nanomaterials including C-doped h-BN,AgNP@BN and BN/?-SnWO4 were successfully prepared by facile methods,such as calcinations and hydrothermal processes.The properties of these h-BN-based nanomaterials were systematically investigated and they exhibited potential applications in environmental field.