Property Comparison of Porous Graphite Nanopowders Prepared by Detonation Splitting Technique with Different Acid Content

N2 adsorption/desorption isotherms and pore diameter distribution of the porous graphite nanopowders, prepared by detonation splitting technique with different acid content in raw materials, were analyzed using Brunauer-Emmet-Teller (BET) equation and Barrett-Joyner-Halenda (BJH) method. The results indicate that there exists hysteresis phenomenon in the product isotherms and the corresponding BET surface area is 5.3~9.2 times of the natural flake graphite which is increasing along with the acid content in raw materials. The difference of the BET surface area among the detonation soot is mainly caused by the pore of which diameter distributing between 3 nm and 7 nm. Moreover, the amount of the pore size at about 4 nm arrived to the maximum after detonation. In addition, the research provides sorption capacity information for application and at the same time it also proves that acid has perfect impact on preparing graphite nanopowders.