Study On The Controllable Preparation And Adsorption Properties Of Porous Hexagonal Boron Nitride-based Nanomaterials

The rise of global industry has driven the consumption of energy and also caused the pollution of global water resources.In the strategy of dealing with water pollution,adsorption has been widely studied as a simple and efficient method.The adsorption material is a material with a high specific surface area and adjustable pore size,which can be used for adsorption in multiple environments.However,most adsorption materials have a slow adsorption rate and can only perform single adsorption,and cannot separate two organic substances with similar properties.As a light-weight,high-porosity material,aerogel is also widely used in water environment treatment,and the mechanical properties and temperature resistance of aerogel are also an important reference for aerogel.As a typical two-dimensional material,boron nitride(BN)has good thermal conductivity,lubrication,biocompatibility and insulation properties,and has attracted the attention of a large number of scientific researchers.Furthermore,porous BN is diffusely used in catalysis and adsorption due to its high specific surface area and abundant pore structure.In view of the above research background and status quo,this study prepared porous BN nanorods,studied and analyzed their composition,structure and morphology,and applied them to water environment treatment.In addition,the BN composite aerogel with high stress was prepared by the air template method,and its morphology and adsorption properties were studied.The main research results and discussions of this article are as follows:(1)The porous BN nanorods with a specific surface area of 1109.11 m²g^-1,a pore volume of 0.454 cm³g^-1,and a pore diameter of 2.60 nm were prepared by high-temperature pyrolysis.(2)The prepared porous BN nanorods have a rapid adsorption capacity for cationic methylene blue dye,and the adsorption equilibrium can be reached within 5 min.In addition,porous BN has faster selective adsorption to cationic dyes.In the mixed solution of Rhodamine B and Congo red,it has faster selective adsorption to the cation Rhodamine B.And,in the mixed solution of Methylene blue and Congo red,it has faster selective adsorption to cationic methylene blue.The selective adsorption of cations is mainly due to the?-?interaction between the aromatic ring of the cationic dye molecule and BN,and the electrostatic attraction between the cationic dye and the negatively charged porous BN nanorods.(3)Through high-speed stirring and introducing a large amount of air,a porous BN composite aerogel with gelatin as a three-dimensional framework was prepared,and its thermal conductivity,temperature resistance,mechanical properties and adsorption properties were tested.The results show that the porous BN composite aerogel has the properties of high stress,low thermal conductivity,and temperature intolerance,as well as ultra-high absorption capacity for widely used organic solvents and oils,and the adsorption capacity is 8 to 33 times its own weight.