The paper was prepared spherical hexagonal boron nitride with different microstructures under flowing ammonia atmosphere. The effect of boron source component ratios (molar ratio of borax and boric acid) on the phase composition of the sample were studied: the work also explored the effect of boron source component ratio on the microstructure and adsorption performance of h-BN. Spherical hexagonal boron nitride had corresponding to shell structure, mesoporous structure, and solid structure when the ratio of boron source components respectively was 1 : 0.5, 1 : 1, and 1 : 2. Between 1 : 1 and 1:0.5, the former had an lower adsorptions at low relative pressures. On the contrary, the adsorption of former would increased at higher relative pressures and reached up 276.02 cm3 g−1, and the maximum adsorption of the latter reached only 228.20 cm3 g−1. Under any relative pressure, the adsorption capacity was the lowest when the boron source composition ratio was 1 : 2.

Keywords: Boron source component ratio, Hexagonal boron nitride, Microstructure, Adsorption performance.