Abstract
In this study, several immobilized ionic liquid adsorbents on carbon materials were synthesized with impregnation method. The carrier materials were activated carbon and three kinds of multi-walled carbon nanotubes. And the synthetic adsorbents immobilized different kinds of ionic liquids were characterized by Boehm titration, FT-IR, XPS, TG, and BET analysis, respectively. Finally, carbon materials after [C4mim]HSO4 immobilization were selected as adsorbent to remove Hg2+ from water phase. The optimum conditions of adsorption test of ionic liquid immobilized by multi-walled carbon nanotubes were as follows: the initial concentration of Hg2+ was 400 mg/L, the adsorbent addition amount was 40 mg, the temperature was 20 °C, the reaction time was 200 min, the removal rate of Hg2+ peaked at 62.95%, the adsorption capacity was reached 79.00 mg/g. The optimum conditions of adsorption test of ionic liquid immobilized by activated carbon were as follows: the initial concentration of Hg2+ was 300 mg/L, the adsorbent addition amount was 0.2 g, the temperature was 20 °C, pH was 2.0, the reaction time was 100 min, the removal rate of Hg2+ was more than 99%, the adsorption capacity was 118.65 mg/g. The adsorption isotherm fitting study found that the adsorption of adsorbent on Hg2+ was more in line with the Langmuir model, and the adsorption kinetics study shows that the adsorption process is consistent with the pseudo-second-order kinetic equation. The results of kinetic analysis are further verified by thermodynamic analysis.
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This work was funded by the National Natural Science Foundation of China (31890773) and the Fundamental Research Funds for the Central Universities (2572019BB02).
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Figure S1
TG curves of MWCNTs-1 (a), MWCNTs-2 (b), MWCNTs-3 (c), MWCNTs-4 (d) and MWCNTs-5 (e) immobilized ILs (JPG 172 kb)
Figure S2
TG curves of MWCNTs-OH-1 (a), MWCNTs-OH-2 (b), MWCNTs-OH-3 (c), MWCNTs-OH-4 (d) and MWCNTs-OH-5 (e) immobilized ILs (JPG 170 kb)
Figure S3
TG curves of MWCNTs-COOH-1 (a), MWCNTs-COOH-2 (b), MWCNTs-COOH-3 (c), MWCNTs-COOH-4 (d) and MWCNTs-COOH-5 (e) immobilized ILs (JPG 173 kb)
Figure S4
TG curves of AC-1 (a), AC-2 (b), AC-3 (c), AC-4 (d) and AC-5 (e) immobilized ILs (JPG 168 kb)
Figure S5
Adsorption isothermal curves of Hg2+ on MWCNTs-3 (a), adsorption data which fitted with different models: Langmuir (b) and Freundlich (c) at different temperatures; MWCNTs-OH-3 adsorption Hg2+ isotherm adsorption curves (d), adsorption data which fitted with different models: Langmuir (e) and Freundlich (f) at different temperatures (JPG 598 kb)
Figure S6
Adsorption isothermal curves of Hg2+ on MWCNTs-COOH-3 (a), adsorption data which fitted with different models: Langmuir (b) and Freundlich (c) at different temperatures; MWCNTs- AC-3 adsorption of Hg2+ isotherm adsorption curves (d), adsorption data which fitted with different models: Langmuir (e) and Freundlich (f) at different temperatures (JPG 587 kb)
Figure S7
Pseudo first-order kinetic model for adsorption of Hg2+ by MWCNTs-3, MWCNTs-OH-3, MWCNTs-COOH-3 and AC-3 (a), pseudo second-order kinetic model (b) (JPG 236 kb)
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Sun, L., Wang, M., Li, W. et al. Carbon material–immobilized ionic liquids were applied on absorption of Hg2+ from water phase. Environ Sci Pollut Res 27, 26882–26904 (2020). https://doi.org/10.1007/s11356-020-09054-y
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DOI: https://doi.org/10.1007/s11356-020-09054-y