Carbon material–immobilized ionic liquids were applied on absorption of Hg2+ from water phase

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]HSO 4 immobilization were selected as adsorbent to remove Hg 2+ 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 Hg 2+ 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 Hg 2+ 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 Hg 2+ 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 Hg 2+ was more than 99%, the adsorption capacity was 118.65 mg/g. The adsorption isotherm fitting study found that the adsorption of adsorbent on Hg 2+ 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.

Ultralight, Mechanically Enhanced, and Thermally Improved Graphene-Cellulose-Polyethyleneimine Aerogels for the Adsorption of Anionic and Cationic Dyes

“…K F describes the adsorption capacity of the adsorption process. The larger the value, the larger the adsorption capacity of the adsorbate [ 62 , 63 ]. The 1/n of the composite aerogel GA-MCC-PEI for the adsorption of the amaranth or methylene blue solutions was between 0.1 and 0.5.…”

A Comparative Analysis of the Effect of Carbonaceous Nanoparticles on the Physicochemical Properties of Hybrid Polyethersulfone Ultrafiltration Membranes

“…The N2 adsorption-desorption isotherm of MWCNTs and GO (Figure 2c) can be categorized as a type IV isotherm with an H1 hysterias loop. The appearance of the H1 loop at P/P0 of 0.8 to 1 indicates the presence of mesoporous along with macroporous structure [26]. The specific surface area of MWCNTs, GO, and graphite is found to be 149.28, 67.14, and 12.9 m 2 g −1 , respectively.…”