3D-agaric like core-shell architecture UiO-66-NH2@ZIF-8 with robust stability for highly efficient REEs recovery

Zhang, Mengmeng; Yang, Kun; Cui, Junshuo; Yu, Hai; Wang, Yuejiao; Shan, Wei; Lou, Zhenning; Xiong, Ying

doi:10.1016/j.cej.2020.124023

Cited by 92 publications

(63 citation statements)

References 56 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%

“…These compounds have been successfully used in such applications as heterogeneous catalysis, storage and separation of gases [17], electrochemistry [18] and photocatalysis [19,20]. Their application as adsorbent materials for various compounds, including heavy metal ions, has been studied to some extent [21,22], but only a limited number of publications have investigated adsorption of REEs. Thus, the full potential of this type of porous materials for recovery of REEs is not fully known.…”

Section: Introductionmentioning

confidence: 99%

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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%

Section: Introductionmentioning

confidence: 99%

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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“…As a proof of concept, UiO-66-NH 2 was chosen as the core-shell construction unit due to its structure stability, well-defined pore structures, and abundant base sites for condensation reaction. [11] The Pd/UiO-66-NH 2 @UiO-66-NH 2 was fabricated by the direct homoepitaxial growth of a MOF shell on the surface of Pd/UiO-66-NH 2 , as schematically illustrated in Scheme 1. The structure and morphology of the UiO-66-NH 2 and the Pd/UiO-66-NH 2 @UiO-66-NH 2 were observed by scanning electron microscope (SEM) and transmission electron microscopy (TEM).…”

Section: Resultsmentioning

confidence: 99%

Multifunctional Pd/MOFs@MOFs Confined Core‐Shell Catalysts with Wrinkled Surface for Selective Catalysis

Chen

Chang

Chen

et al. 2021

Chemistry An Asian Journal

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Process intensification, targeting the maximization of spatial-temporal productivity utilizing minimum energy and resources has always been the constant trends especially in chemical industry. In this regard, tandem reactions that are able to perform a multi-step reaction in a single pot by eliminating costly separation steps have been viewed as a typical paradigm. However, a spatial isolation of varied active sites with a controlled manner in a single catalyst to avoid deactivation and work synergistically is a challenging problem yet sometimes being overlooked. In this work, a spatial base-metal core-shell structured catalyst with wrinkled surface was successfully fabricated by a direct homoepitaxial growth method in an acid/water system, which exhibited increased hydrophobicity, exposure of active sites and significantly improved product selectivity towards one-pot Knoevenagel condensation-hydrogenation tandem reaction compared with the uncoated catalyst. Meanwhile, the catalytic performance was largely retained and the structural stability was maintained even after successive 8 cycles, which shows great promise for industrial applications.

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“…35 For example, MIL (Materials of Institute Lavoisier) MOFs, ZIF (Zeolitic Imidazolate Framework), PBAs (Prussian blue analogs), and other types of nanoMOF nanostructures are usually used as the core and embedded within a second MOF layer. 36 Core–shell MOF-on-MOF heterostructures can combine the superior properties of their core and shell MOFs and substantially overcome the shortcomings of single MOFs. 37 Their enhanced synergistic selective performance can be designed through the lattice choice and synthetic route for application in catalysis, sorption or separation, and molecular recognition.…”

Section: Heterostructures and Hybrid Types Of Mofs/cofsmentioning

confidence: 99%

“…Various core–shell MOF@MOF hybrids are often prepared through a stepwise approach, where the MOF core is firstly generated and further explored as a template for growing the shell. 36 Aiming at the full combination of the shell and core components, lattice matching is necessary. However, this increases the difficulty in the development of synthetic methods to meet the requirement of lattice-matching for core–shell MOF@MOF nanohybrids.…”

Section: Heterostructures and Hybrid Types Of Mofs/cofsmentioning

confidence: 99%

Heterostructured hybrids of metal–organic frameworks (MOFs) and covalent–organic frameworks (COFs)

et al. 2022

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3D-agaric like core-shell architecture UiO-66-NH2@ZIF-8 with robust stability for highly efficient REEs recovery

Cited by 92 publications

References 56 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)

Multifunctional Pd/MOFs@MOFs Confined Core‐Shell Catalysts with Wrinkled Surface for Selective Catalysis

Heterostructured hybrids of metal–organic frameworks (MOFs) and covalent–organic frameworks (COFs)

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