Fig. 4

BJH adsorption dV/dr Pore volume distribution for bone char-nPrN-SO3H obtained from pyrolyzed of Cattle bones at 450 °C temperatures with residence time 4.5 h.

BJH adsorption dV/dr Pore volume distribution for bone char-nPrN-SO3H obtained from pyrolyzed of Cattle bones at 450 °C temperatures with residence time 4.5 h.