Sulfur-Assisted Synthesis of Highly Porous Macroporous Boron Nitride Materials

Three-dimensional(3D) macroporous boron nitride materials with a certain order of pore arrangements have been synthesized in the existence of sulfur powders.The as-obtained materials exhibit open macropores with high specific surface area of 230 m2·g-1 and high porosity of 85.6%.Without addition of sulfur disordered 3D macroporous boron nitride was formed only and its specific surface area and porosity were decreased to 122 m2·g-1 and 73.7%,respectively.Both of the products obtained with and without addition of sulfur show good oxidation resistance below 800 ℃.The formation process and the role of sulfur powders were studied.