Ionic liquid entrapped UiO-66: Efficient adsorbent for Gd3+ capture from water

Ahmed, Imteaz; Adhikary, Keshab Kumar; Lee, Yu-Ri; Row, Kyung Ho; Kang, Kyung-Ku; Ahn, Wha‐Seung

doi:10.1016/j.cej.2019.03.265

Cited by 62 publications

(19 citation statements)

References 58 publications

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“…4b, Table 2). All the materials had higher selectivity towards Er 3+ than to Gd 3+ and Nd 3+ when compared to recently studied adsorbents (Table 3), such as MOFs [21,[67][68][69], zirconium (IV) organophosphonates [33,35], commercial resins [70], PEI cellulose nanocrystals [71], and competitive with functionalized mesoporous silica KIT-6 [72]. Moreover, MIL-101-T50 shows practically no adsorption of Nd 3+ or Gd 3+ .…”

Section: Selectivity Testsmentioning

confidence: 81%

Selective recovery and separation of rare earth elements by organophosphorus modified MIL-101(Cr)

Kavun

Veen

Repo

2021

Microporous and Mesoporous Materials

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Development of state-of-the-art selective adsorbent materials for recovery of rare earth elements (REEs) is essential for their sustainable usage. In this study, a metal-organic framework (MOF), MIL-101(Cr), was synthesized and post-synthetically modified with optimised loading of the organophosphorus compounds tributyl phosphate (TBP), bis(2-ethylhexyl) hydrogen phosphate (D2EHPA, HDEHP) and bis(2,4,4-trimethylpentyl) phosphinic acid (Cyanex®-272). The materials were characterized and their adsorption efficiency towards Nd 3+ , Gd 3+ and Er 3+ from aqueous solutions was investigated. The MOF derivatives demonstrated an increase in adsorption capacity for Er 3+ at optimal pH 5.5 in the order of MIL-101-T50 (37.2 mg g − 1 ) < MIL-101-C50 (48.9 mg g − 1 ) < MIL-101-H50 (57.5 mg g − 1 ). The exceptional selectivity of the materials for Er 3+ against transition metal ions was over 90%, and up to 95% in the mixtures with rare earth ions. MIL-101-C50 and MIL-101-H50 demonstrated better chemical stability than MIL-101-T50 over 3 adsorption− desorption cycles. The adsorption mechanism was described by the formation of coordinative complexes between the functional groups of modifiers and Er 3+ ions.

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Section: Selectivity Testsmentioning

confidence: 81%

Selective recovery and separation of rare earth elements by organophosphorus modified MIL-101(Cr)

Kavun

Veen

Repo

2021

Microporous and Mesoporous Materials

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“…Table 2 provides the results of comparative study of PAMGO-3 with other adsorbents for Gd(III) removal from an aqueous solution. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]17,18 Gratifyingly, it can be found that the PAMGO-3 is a good candidate as an adsorbent with the second highest Gd(III) adsorption capacity, which is probably attributed to the large specific surface area, the abundant PAPA functional groups on PAMGO-3, and excellent surface complexation between PAGMO-3 and Gd(IIII) ion during the sorption process. Although the GO/CNt shows a slightly higher Gd(III) uptake, its separation requires a dialysis bag, and the special and more complex procedures for the Gd(III) adsorption in these systems may hinder their practical application.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…As an important rare earth metal (REM), gadolinium (Gd) is widely used in many industries such as medical imaging, information, metallurgy, and nuclear. , However, Gd(III) ions effluents discharged from such industries has aroused wide concern because of its high toxicity, carcinogenicity, and bioaccumulation. − Therefore, the uptake of Gd(III) from wastewater is essential before disposal, and adsorption is considered to be the most promising method for its recovery from low-concentration sources of Gd(III), because of the straightforward advantages such as high efficiency, simple operation, and low-cost. − A variety of adsorbents for Gd(III) removal have been developed accordingly, including porous metal–organic frameworks (MOFs), − silica-based materials, ,, polymers, ,,, carbons, ,, and metal oxides . Among them, graphene oxide, the oxidation product of graphene with abundant oxygen-containing functional groups, high mechanical stability, and large specific surface area has attracted special attention owing to the exhibition of significantly higher potential for such treatment. , For example, Chen et al used GO-based adsorbent to remove Gd(III) in aqueous solution by surface complexation of Gd(III) with −COOH functional groups in GO.…”

Section: Introdctionmentioning

confidence: 99%

A Facile One-Pot Strategy to Functionalize Graphene Oxide with Poly(amino-phosphonic Acid) Derived from Wasted Acrylic Fibers for Effective Gd(III) Capture

Yin

Fang

Xia

et al. 2019

ACS Sustainable Chem. Eng.

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Today, toxic rare earth metal ions contamination and huge volume of waster acrylic fibers (WAFs) have caused serious environmental problems, which make the development and implementation of feasible and sustainable methods to recycle the wastes of high practical significance. Herein, we propose, for the first time, that using WAFs as a poly(amino-phosphonic acid) (PAPA) precursor to functionalize graphene oxide (GO) based on the excellent chelating ability of PAPA and remarkable properties of GO. In this study, four novel PAPA modified magnetic graphene oxide (MGO) composites (PAMGOs) with different PAPA concentrations (PAMGO-1, PAMGO-2, PAMGO-3, and PAMGO-4) were fabricated by a facile one-pot sequential reaction method, and used as adsorbent for capturing Gd(III) from aqueous solutions. The prepared materials were characterized by various technologies. Batch adsorption results demonstrate that Gd(III) capture relies upon the content of PAPA grafted onto MGO and the pH of solution. In addition, PAMGO-3 not only shows the best Gd(III) sorption performance among tested adsorbents with the maximum uptake capacity of 499.42 mg/g at 298 K, but also demonstrates a high selectivity of Gd(III) ion over various coexisting ions, these results are attributed to the synergistic effect of MGO and PAPA in PAMGO-3. Moreover, the adsorption isotherm is in better agreement with the Langmuir model, and kinetics data follow the pseudo-second-order equation. The thermodynamic studies indicate the uptake of Gd(III) on PAMGO-3 is spontaneous and endothermic. Furthermore, recycling experiments confirm that no obvious loss of adsorption capacity occurred for the PAMGO-3 after six consecutive cycles. This study provides a new perspective to prepare PAMGO-3 from WAFs and shows its use as a promising adsorbent for Gd(III) elimination in aqueous solutions.

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“…Freezing of ILs is prevented due to the presence of frameworks, and thus, the material is proven to be an efficient ionic conductor even at low temperatures . In a recent report by Ahn and co-workers, they successfully described the use of IL/MOF composites on efficient removal of Gd 3+ ions from water . The catalytic activity of IL/MOF composites also is explored in a number of studies. , …”

Section: Introductionmentioning

confidence: 99%

“…40 In a recent report by Ahn and co-workers, they successfully described the use of IL/MOF composites on efficient removal of Gd 3+ ions from water. 44 The catalytic activity of IL/MOF composites also is explored in a number of studies. 45,46 Even though there are numerous reports on IL/MOF and IL/ZIF systems for gas adsorption and separation, in this study, we have employed simple and binary mixture of ILs (i.e.,…”

Section: Introductionmentioning

confidence: 99%

The Role of Binary Mixtures of Ionic Liquids in ZIF-8 for Selective Gas Storage and Separation: A Perspective from Computational Approaches

Thomas

Prakash

2020

J. Phys. Chem. C

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Carbon dioxide is one of the major causes of global climatic changes. Efficient separation of CO 2 from different gaseous mixtures can be helpful in flue gas separation, gas sweetening, natural gas processing, and so forth. Adsorption in porous materials is emerging as one of the best techniques in this regard. Also CO 2 is easily soluble in ionic liquids (ILs). Hence, we have designed IL (designer solvent)-based composite materials by impregnating ILs into the pores of zeolitic imidazolate framework (ZIF)-8. In this study, we have computationally explored the properties of such composites. Mixture of different types of ILs can enhance composite material properties and leads to efficient gas separation. We studied both simple and binary mixtures of ILs in the nanopores of ZIF-8 using density functional theory (DFT) and grand canonical Monte Carlo (GCMC) methods. ZIF-8 retained its core structure even after IL incorporation, and also the ILs were well dispersed in the confinement. Gas adsorption studies were performed for gases such as CO 2 , N 2 , and CH 4 and their binary mixtures. Both singlecomponent and binary mixture adsorptions were similar at a pressure less than 1 bar. The selectivity calculated from the gas mixture adsorption elicited that our materials show good selective adsorption of CO 2 compared with the other two gases. The binary mixture of ILs enhanced the CO 2 selectivity by 3.5-fold higher than simple ILs@ZIF-8. Especially, the composite with hydrophobic− hydrophobic binary IL mixture has higher CO 2 selectivity than other materials, attributed to the strong interactions between CO 2 and IL anions. The like−like hydrophobic ion pair and the fluorine content in the IL enhanced the selective adsorption of CO 2 . The binary IL mixtures at the confinement can be a novel alternative to the prevailing materials in gas separation applications.

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Ionic liquid entrapped UiO-66: Efficient adsorbent for Gd3+ capture from water

Cited by 62 publications

References 58 publications

Selective recovery and separation of rare earth elements by organophosphorus modified MIL-101(Cr)

Selective recovery and separation of rare earth elements by organophosphorus modified MIL-101(Cr)

A Facile One-Pot Strategy to Functionalize Graphene Oxide with Poly(amino-phosphonic Acid) Derived from Wasted Acrylic Fibers for Effective Gd(III) Capture

The Role of Binary Mixtures of Ionic Liquids in ZIF-8 for Selective Gas Storage and Separation: A Perspective from Computational Approaches

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