Fig. 6

The influence of the CPF concentration on the uptake capacities of coal based adsorbent (A, B, C, and D), fitting of the CPF uptake behaviors with classic Langmuir model (E, F, G, and H), fitting of the CPF uptake behaviors with classic Freundlich model (I, J, K, and L), and fitting of the CPF uptake behaviors with classic D–R model (M, N, O, and P).