Fig. 4From: Three-dimensional hierarchical porous carbon derived from natural resources for highly efficient treatment of polluted watera Equilibrium adsorption isotherms, b Langmuir, c Freundlich d and Temkin isotherms of MB on C-500 and PC-500-Y. (20 mg of C-500 or PC-500-Y added to a 50 ml MB solution (10–80 or 100–550 mg/L) at a designated concentration after stirring for 12 h.)Back to article page