2D water-stable zinc-benzimidazole framework nanosheets for ultrafast and selective removal of heavy metals

Xu, Rongming; Jian, Meipeng; Ji, Qinghua; Hu, Chengzhi; Tang, Chaochun; Liu, Ruiping; Zhang, Xiwang; Qu, Jiuhui

doi:10.1016/j.cej.2019.122658

Cited by 63 publications

(25 citation statements)

References 71 publications

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“…Two-dimensional (2D) MOFs with 2D morphology and high lateral area-to-thickness aspect ratio (Peng et al, 2014;Zhao et al, 2018;Li et al, 2019a) can expose every active site on their surface that is available to pollutants without diffusion limitations, and this obvious advantage with respect to the three-dimensional counterparts makes 2D MOFs a rapidly growing concern in the field of water purification (Xu et al, 2018;Dhakshinamoorthy et al, 2019;Xu et al, 2020). Structural regulation or postmodification based on 2D MOFs is important to achieve its high adsorption performance for pollutant removal.…”

Section: Introductionmentioning

confidence: 99%

Bimetallic Coordination in Two-Dimensional Metal–Organic Framework Nanosheets Enables Highly Efficient Removal of Heavy Metal Lead (II)

Liu

Shen

et al. 2021

Front. Chem. Eng.

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Two-dimensional (2D) metal–organic frameworks (MOFs) have emerged as intriguing 2D materials because of their specific features of 2D morphology and designable skeletons, which have elicited great interest in environment remediation. In this work, 2D MOF nanosheets are fabricated via a mixed-solvent solvothermal method, and a regulation strategy of metal inorganic clusters on MOFs is used to construct two different 2D MOFs with monometallic and bimetallic coordination, that is, Ni-MOF and Ni/Cd-MOF. Binary metal coordination renders more crystal defects and vacancies in the framework; thus, compared to monometallic Ni-MOF, bimetallic Ni/Cd-MOF exhibits fewer layers (4∼5 layers), higher specific surface area, larger pore size, and higher surface electronegativity, which leads to its excellent adsorption removal for Pb2+, with higher adsorption rate and affinity, and superior adsorption capacity (950.61 mg/g, almost twice as high as that of monometallic Ni-MOF). Besides, the adsorption mechanism further confirmed that the carboxyl groups (−COO−) from organic linker on 2D MOFs serve as the main binding sites for Pb2+ coordination, and bimetallic Ni/Cd-MOF has more active −COO− sites for Pb2+ capture. Thus, the bimetallic Ni/Cd-MOF regulated by heterogeneous metal atoms shows promising application for highly efficient adsorption of heavy metal ions.

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Section: Introductionmentioning

confidence: 99%

Bimetallic Coordination in Two-Dimensional Metal–Organic Framework Nanosheets Enables Highly Efficient Removal of Heavy Metal Lead (II)

Liu

Shen

et al. 2021

Front. Chem. Eng.

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“…Xu and coworkers synthesized a 2D water-stable zinc-benzimidazole framework nanosheet of Zn(Bim)(OAc)-NS, as a adsorbent for heavy metals which finally reached the maximum adsorption capacities of 235.8 mg g À 1 for Pb(II) and 335.57 mg g À 1 for Cu(II), respectively, showing much better than that of the 3D MOF bulks adsorbent (Figure 4a). [84] Moreover, the material showed high selectivity towards Pb(II) and Cu(II), with the sequence of Pb(II)>Cu(II)>Ni(II)>Co(II)>Cd(II). The adsorption mechanism came to the formation of outer-sphere surface complexes with hydroxyl and imino groups within Zn(Bim)(OAc)À NS.…”

Section: Heavy Metal Ionsmentioning

confidence: 98%

2D MOFs‐based Materials for the Application of Water Pollutants Removing: Fundamentals and Prospects

Liu

Mao

et al. 2021

Chemistry An Asian Journal

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Water quality can have serious impacts on human health. One crucial issue of water pollution seriously affects our safety due to the continually emerging of discovered anthropogenic pollutants. The water treatment technologies are persistent improvement to adapt such new contaminants, which accelerates the evolution of materials science to explore solving the problems. Metal-organic Frameworks (MOFs) as the significant porous and multi-dimensional networks has been concerned for toxic pollutant elimination, especially probed the applications of outstanding layered 2D skeletons MOFs-based materials. The emphases of this review highlight the 2D MOFs-based materials used in water remediation and treatment strategies including adsorption and catalysis methods. Further, the prospects and challenges of 2D MOFs-based materials for water treatments applications would be surveyed meticulously for the future research and development.

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“…[204] Similarly, Xu et al used MONs with exposed imino and hydroxyl groups to selectively adsorb Pb 2+ and Cu 2+ ions, respectively, from a solution containing other heavy metals (Figure 16c). [195] Facile access to adsorbing sites on the MON surface resulted in fast adsorption kinetics, with saturation occurring within 90 and 30 min for Pb 2+ and Cu 2+ and maximum loadings of 253.8 and 335.6 mg g −1 , respectively. Metal sites are coordinatively saturated within this framework structure, therefore outer-sphere surface complexes dominated the metal adsorption mechanism.…”

Section: Heavy Metal Adsorptionmentioning

confidence: 98%

“…Reproduced with permission. [195] Copyright 2020, Elsevier. d) Illustration of the "off" (left) state in the ion current rectification, which results from ion concentration depletion in the nanochannels, and "on" (right) state.…”

Section: Organicsmentioning

confidence: 99%

Metal–Organic Framework Nanosheets: Programmable 2D Materials for Catalysis, Sensing, Electronics, and Separation Applications

Nicks¹,

Sasitharan²,

Prasad³

et al. 2021

Adv Funct Materials

102

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offers advantages over simple inorganic nanosheets in that a diverse range of physical and chemical properties can be programmed into their crystalline structure (Figure 1). This distinct combination of properties makes MONs ideal for a wide range of catalysis, sensing, electronics, and separation applications which will be the focus of this review.Much of the early literature in this field focused on the development of novel MON architectures and new routes towards their synthesis. A diverse range of different metal ions and organic linkers have been used to construct MONs. [4] However the field has rapidly converged on a handful of popular secondary building units (SBUs) which dominate much of the literature thanks to their reliable formation of high aspect ratio nanosheets. Popular classes of MONs that have been widely applied by different groups in applications include those based on the metal paddlewheel (PW) motif, [5][6][7] axially capped Zr and Hf clusters, [8][9][10][11] 2D zeolitic imidazolate frameworks (ZIFs), [12][13][14] and square planar Ni, Co, and Cu SBUs. [15][16][17][18] The modular structure of MONs, ease of functionalization and diverse range of materials they can be combined with means that MONs can be readily "programmed" to provide the desired topology and properties required for a given application.A wide variety of methods have been explored to synthesize MONs, either "top-down" by the exfoliation of layered metalorganic frameworks (MOFs) or "bottom-up" by assembly of molecular building blocks directly into nanosheets. The majority of top-down approaches utilize mechanical energy to overcome inter-layer interactions, such as liquid-assisted ultrasonication, [19] shear-mixing, [20] and grinding/ball-milling, [13] or the less common freeze-thaw [21] and "scotch-tape" methods. [22,23] Other methods involving photochemical, [24] electrochemical, [25] and chemical intercalation, [26] have also been developed but are less widely used. Bottom-up methodologies typically utilize surfactants or modulators to inhibit crystal growth in one dimension, [12,27,28] or layering/interfacial methods to promote anisotropic growth. [15,29,30] The use of sacrificial 2D templates has also recently emerged a promising route. [31,32] Each approach has advantages and disadvantages in terms of the thickness, lateral dimensions, size distribution, quantity and quality of the MONs produced, and the best approach therefore varies depending on the application.

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2D water-stable zinc-benzimidazole framework nanosheets for ultrafast and selective removal of heavy metals

Cited by 63 publications

References 71 publications

Bimetallic Coordination in Two-Dimensional Metal–Organic Framework Nanosheets Enables Highly Efficient Removal of Heavy Metal Lead (II)

Bimetallic Coordination in Two-Dimensional Metal–Organic Framework Nanosheets Enables Highly Efficient Removal of Heavy Metal Lead (II)

2D MOFs‐based Materials for the Application of Water Pollutants Removing: Fundamentals and Prospects

Metal–Organic Framework Nanosheets: Programmable 2D Materials for Catalysis, Sensing, Electronics, and Separation Applications

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