Abstract:

By using the precursor conversion method, one-dimensional boron nitride fibers, two-dimensional boron nitride films and coatings, and three-dimensional boron nitride composite materials have been prepared, which cannot be prepared by traditional preparation methods. Dimethylamine, boron trichloride, ammonia and methylamine were used as raw materials to obtain the boron nitride precursor tri（methylamino） borazine by multi-step reaction, and the boron nitride porous materials were obtained by high temperature sintering. The structures of the intermediates dichlorodimethylamino borane and tri（dimethylamine） borazine and the precursor tri（methylamino） borazine were characterized by FTIR and NMR. The porous boron nitride structures and morphologies were characterized by XRD and SEM. The results show that tri（methylamino） borazine with low carbon content can be synthesized through the synthesis of precursor intermediates. The adsorption capacity of porous boron nitride materials for various metal ions was determined by investigating the adsorption capacity of porous boron nitride materials for metal ions. The results show that the porous boron nitride prepared by using precursor intermediates has high specific surface area and excellent adsorption performance, which can effectively remove the metal ions from the solution and provide new ideas for the preparation of boron nitride adsorption materials. This method solves the problems of low industrialization yield and high difficulty. The use of organic precursor method to prepare boron nitride compensates for the shortcomings of uneven element distribution, easy moisture absorption, and easy pulverization in inorganic preparation, providing new ideas for the preparation of adsorbents.

Key words: porous boron nitride, precursor, adsorption characteristics, metal ion