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. 2019 Jan 16;9(1):100. doi: 10.3390/nano9010100

Table 4.

Langmuir and Freundlich model parameters for magnetic char and magnetic lignite.

Sample Description Langmuir Model Freundlich Model
Qm (mg/g) b (L/mg) R 2 KF (L/g) n R 2
Magnetic char—As(V), pH 3.9 19.9 0.02715 0.9917 4.13 4.10 0.9549
Magnetic lignite—Cd(II), pH 6.5 70.4 0.09543 0.9941 17.16 2.95 0.9389
Magnetic char—Cd(II), pH 6.8 58.8 0.03750 0.9873 8.70 3.73 0.9696