Fig 1.
FT-IR spectra of pristine FDU-12, FDU-12-MA, FDU-12-TA, pristine PMMA, FDU-12-MA/PMMA, pristine NY6, and FDU-12-TA/NY6.
Fig 2.
FE-SEM images of pristine FDU-12, FDU-12-MA, FDU-12-TA, FDU-12-MA/PMMA, and FDU-12-TA/NY6 at three magnifications.
Fig 3.
TEM images of pristine FDU-12.
Fig 4.
N2 adsorption/desorption isotherms of (a) pristine FDU-12, (b) FDU-12-MA, (c) FDU-12-TA, and (d) the BJH pore size distribution curves of the samples.
Table 1.
Textural properties of the synthesized pristine FDU-12, FDU-12-MA, and FDU-12-TA.
Fig 5.
The effect of (a) pH, (b) adsorbent amount, and (c) contact time on adsorption of Pb(II) by the prepared adsorbents.
Fig 6.
The kinetic adsorption models of (a) pseudo-first-order, (b) pseudo-second-order, (c) Elovich, (d) intra-particle diffusion; (e) the equilibrium isotherm and the isotherm models of (f) Langmuir, (g) Freundlich, and (h) Dubinin–Radushkevich for the adsorption of Pb(II) onto FDU-12-MA/PMMA and FDU-12-TA/NY6.
Table 2.
The parameters obtained by kinetic models for the adsorption of Pb(II) onto FDU-12-MA/PMMA and FDU-12-TA/NY6.
Table 3.
The parameters obtained by isotherm models for the adsorption of Pb(II) onto FDU-12-MA/PMMA and FDU-12-TA/NY6.
Table 4.
Comparison of the adsorption capacity of FDU-12-MA/PMMA and FDU-12-TA/NY6 toward Pb(II) ions with other adsorbents.
Fig 7.
The calculated values of RL.