Composites of porous materials with ionic liquids: Synthesis, characterization, applications, and beyond

Effect of Surface Characteristics of Graphene Aerogels and Hydrophilicity of Ionic Liquids on the CO2/CH4 Separation Performance of Ionic Liquid/Reduced Graphene Aerogel Composites

“…Accordingly, the IL loadings for [BMPyr]­[DCA]/rGA300 and [BMPyr]­[DCA]/rGA500 were determined as 44 and 43 wt %, respectively, whereas the corresponding values were 40 and 42 wt % for [BMPyr]­[PF 6 ]/rGA300 and [BMPyr]­[PF 6 ]/rGA500, respectively. The difference between the targeted IL loading, 50 wt %, and the amounts determined by these washing experiments might be related to the loss of some ILs on the sample flask during the deposition of IL onto the rGA , and to the possibility of incomplete removal of ILs from the composites during the washing experiments. However, the results still confirm that each composite has the same IL loading of approximately 42 ± 2 wt %.…”

“…For instance, Ghosh and Ramaprabhu demonstrated the increase in CO 2 adsorption capacity of graphitic carbon nitride by functionalizing it with an IL, 1-butyl-3-methylimidazolium bis­(trifluorosulfonyl)­imide, [BMIM]­[TFSI], and at 15 bar, the CO 2 uptake of the IL-loaded composite was reported as 19.8 mmol/g, almost 2 times higher than the uptake of the host material (8.5 mmol/g) . Moreover, several recent studies showed that IL incorporation into MOFs, COFs, and other carbonaceous materials offers tremendous potential for enhanced gas separation performance. , Our group extended this approach to activated carbon and coated it with an IL, 1-butyl-3-methylimidazolium acetate, [BMIM]­[OAc], and reported practically complete CO 2 selectivity over CH 4 and N 2 . Moreover, density functional theory calculations and grand canonical Monte Carlo simulations were used to investigate the impact of IL incorporation to 2D graphene layers, and the results showed that choosing 1-ethyl-3-methylimidazolium tetrafluoroborate ([EMIM]­[BF 4 ]) decreased the interlayer spacing between sheets and available pore size, resulting in CO 2 /CH 4 mixture selectivities as high as ∼1000 …”

Mercury (II) removal from aqueous solutions by iron nanoparticles synthesized from extract of Eucalyptus grandis

“…The result of the study carried out to evaluate the retention capacity of the nanoparticles compared to a modified resin of Pinus patula tannins [ 35 ] and commercial activated carbon can be observed in Figure 12 , where it is shown that the percentage of mercury adsorption in the synthesized nanoparticle using extract from E. grandis foliage is lower than other materials studied. Said behavior and apparent improvement in adsorption capacity of the other adsorbents towards Hg (II) is probably due to the presence of non-ionizable organic compounds such as polyphenols on the particle surface obtained using foliage extract of E. grandis [ 50 ] which would explain why its lower capacity to retain mercury compared to activated carbon or resin obtained from the modification of Pinus patula tannins [ 35 ]. Synthesized particle present very low solubility in water and is effective for absorption of Hg (II) in 79.26% under experimental condition developed therefore can suitably be used in retention experiments, capture and recovery of mercury in solution, in addition to presenting advantages due to its magnetic behavior, for which the particle can be recovered from the environment more easily using magnetic fields, its low toxicity and the ability to modify its surface by functionalization to improve its retention properties of the target metal, in this case mercury.…”

“…In comparison, modified tannin resin obtained from bark of Pinus patula [ 35 ], due to its mostly activated groups, presented, like activated carbon, a greater adsorption in the medium, this due to activated groups present on its surface and that interact on a larger scale with mercury in solution. This implies that although this magnetite particle is capable of retaining mercury in its current state, an activation or functionalization process of its surface with more receptive compounds would improve its ability to retain the analyte of [ 50 ]. However, one must consider the fact that in relation to the adsorbent’s affinity with respect to adsorbate (1/n), the nanoparticle has a higher value (0.6269 L/mg) compared to modified resin (0.5303 L/mg) and activated carbon (0.2299 L/mg) [ 36 ], which would indicate that although adsorption percentage of the particle is lower compared to the other two adsorbents, adsorption on the particle is much stronger.…”

MOF/COF hybrids as next generation materials for energy and biomedical applications

“…In the last years, ionic liquids, molten salts in liquid form at room temperature, have been incorporated into MOFs and COFs to post-synthetically modify their pore environments which leads to enhanced gas separation and catalysis performances due to the strong molecular interactions between ionic liquids and adsorbate molecules. 83 Similarly, incorporating ionic liquids into MOF/COF hybrids to tune the pore shape/size and affinity towards target molecules can be another interesting venue. Advances in experimental and computational methodologies in the future will provide an in-depth insight into the design and development of new MOF/COF hybrids which can outperform pristine MOFs and COFs for various applications by combining the advantages of two material families.…”