Selective Adsorption of Rare Earth Elements over Functionalized Cr-MIL-101

Lee, Yu-Ri; Yu, Kwangsun; Ravi, Seenu; Ahn, Wha‐Seung

doi:10.1021/acsami.8b07130

Cited by 200 publications

(120 citation statements)

References 59 publications

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“…To the best of the authors' knowledge, no data related to the adsorption of Ce(III) cations onto K10-Mt are available. The adsorption capacity values reported in literature for the uptake onto different supports [115][116][117] are of the same order of magnitude or lower than those obtained in the present work.…”

Section: Langmuirsupporting

confidence: 61%

Simultaneous Removal and Recovery of Metal Ions and Dyes from Wastewater through Montmorillonite Clay Mineral

et al. 2019

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The main objective of this work was to evaluate the potential of Montmorillonite nanoclay (Mt), readily and inexpensively available, for the simultaneous adsorption (and removal) of two classes of pollutants: metal ions and dyes. The attention was focused on two “model” pollutants: Ce(III) and crystal violet (CV). The choice is due to the fact that they are widespread in wastewaters of various origins. These characteristics, together with their effect on human health, make them ideal for studies on water remediation. Moreover, when separated from wastewater, they can be recycled individually in industrial production with no or simple treatment. Clay/pollutant hybrids were prepared under different pH conditions and characterized through the construction of the adsorption isotherms and powder X-ray diffraction. The adsorption behavior of the two contaminants was revealed to be significantly different: the Langmuir model reproduces the adsorption isotherm of Ce(III) better, thus indicating that the clay offers a unique adsorption site to the metal ions, while the Freundlich model proved to be the most reliable for the uptake of CV which implies heterogeneity of adsorption sites. Moreover, metal ions do not adsorb at all under acidic conditions, whereas the dye is able to adsorb under all the investigated conditions. The possibility to modulate the adsorption features by simply changing the pH conditions was successfully employed to develop an efficient protocol for the removal and separation of the different components from aqueous solutions mimicking wastewaters.

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Section: Langmuirsupporting

confidence: 61%

Simultaneous Removal and Recovery of Metal Ions and Dyes from Wastewater through Montmorillonite Clay Mineral

et al. 2019

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“…MIL-101(Cr) has been found to have remarkable stability during long-term exposure to acidic and alkaline solutions, H 2 O 2 and air [23], and it could thus be considered an appropriate candidate for REE recovery. However, the pristine MIL-101(Cr) showed a weak affinity towards REEs, while a post-synthetic modification by various functional groups enhanced the adsorption capacity and selectivity, making it a promising material compared to traditional adsorbents [24].…”

Section: Introductionmentioning

confidence: 99%

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

Kavun

Veen

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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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“…15,16 MOFs with amino groups have been reported to be easily modified to introduce different functionalities via covalent PSM. 17−19 For example, amino-MOFs were modified covalently with various reagents such as aldehydes, 20 acetic anhydride, 21 phenyl isocyanate, 22 polyethyleneimine, 23 and peptide coupling reagents. 24 However, the covalent PSM of many microporous MOFs might be hindered by their low stability and small pore size.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Functionalization of Porous Zr-Diaminostilbenedicarboxylate Metal–Organic Framework for Storage and Stable Delivery of Ibuprofen

2019

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A stable porous metal–organic framework (MOF), Zr-diaminostilbenedicarboxylate (Zr-DASDCA), was synthesized and modified with oxalyl chloride (OC) or terephthaloyl chloride (TC) to introduce various functional groups onto the Zr-DASDCA. Both pristine and functionalized Zr-DASDCAs, together with activated carbon, were used as a potential carrier for ibuprofen (IBU) storage and delivery. Zr-DASDCAs, especially the modified ones (OC-Zr-DASDCA and TC-Zr-DASDCA), showed competitive results in IBU delivery. Specifically, the release rate in phosphate-buffered saline solution at pH 7.4 was nearly constant ( R 2 ≈ 0.98) for up to 10 days, which would be very effective in IBU dosing to the human body. Moreover, the release rate could be controlled by changing the pH of the releasing solution. The rate of IBU release from both pristine and modified Zr-DASDCAs at pH 7.4 and 3.0 was also explained with a few interactions such as H-bonding and electrostatic repulsion, together with the relative pore size of the Zr-DASDCAs. Therefore, the results suggested that functionalization of MOFs via postsynthetic modification, especially with OC and TC, to introduce various functional groups onto MOFs is an effective approach to not only reducing the release rate of IBU but also inducing a constant release of IBU for as long as 10 days.

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Selective Adsorption of Rare Earth Elements over Functionalized Cr-MIL-101

Cited by 200 publications

References 59 publications

Simultaneous Removal and Recovery of Metal Ions and Dyes from Wastewater through Montmorillonite Clay Mineral

Simultaneous Removal and Recovery of Metal Ions and Dyes from Wastewater through Montmorillonite Clay Mineral

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

Synthesis and Functionalization of Porous Zr-Diaminostilbenedicarboxylate Metal–Organic Framework for Storage and Stable Delivery of Ibuprofen

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