Fig. 6

Langmuir for REEs/C-4 (a), REEs/C-6 (b) and REEs/C-8 (c) and Freundlich for REEs/C-4 (d), REEs/C-6 (e) and REEs/C-8 (f) with Pb(II) removal (n = 3).
Langmuir for REEs/C-4 (a), REEs/C-6 (b) and REEs/C-8 (c) and Freundlich for REEs/C-4 (d), REEs/C-6 (e) and REEs/C-8 (f) with Pb(II) removal (n = 3).