Mixed Nanosheet Membranes Assembled from Chemically Grafted Graphene Oxide and Covalent Organic Frameworks for Ultra-high Water Flux

Khan, Niaz Ali; Yuan, Jinqiu; Wu, Hong; Cao, Li; Zhang, Runnan; Liu, Yanan; Li, Lianshan; Rahman, Abdur; Kasher, Roni; Jiang, Zhongyi

doi:10.1021/acsami.9b09945

Cited by 73 publications

(47 citation statements)

References 60 publications

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“…In addition, nanocomposites that were constructed by 2D COF nanosheets and other 2D materials, especially GO materials, have been widely investigated. [181][182][183][184][185][186][187] In particular, several composites were prepared by in situ growth COF nanosheets on GO nanosheets under solvothermal conditions. [185,186] In addition, two types of COF nanosheets with opposite charges and different apertures have also been applied to LBL-staggered stacking under the drive of electrostatic interaction to narrow the apertures of COF membranes.…”

Section: Lbl Stackingmentioning

confidence: 99%

“…In additional, some COF hybrid membranes that were derived from the combination of COF nanosheets and other 1D and 2D materials also perform well in the separation of organic micropollutants. [180,[183][184][185]187] For instance, Jiang and coworkers used the nanocomposites that were constructed by 1D CNFs and 2D COF nanosheets through strong H-bonding interaction as starting materials to fabricate COF hybrid membranes via vacuum filtration. [180] Thus-synthesized COF membranes showed good molecular sieving (including dyes removal and alcohol/water separation) and desalination performances due to the narrowed aperture that resulted from the shielding effect of the CNFs.…”

Section: Water Treatmentmentioning

confidence: 99%

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Covalent Organic Framework Membranes for Efficient Chemicals Separation

et al. 2021

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Membrane-based separation is an emerging technology to separate different components. [1] Owing to not only the functions of separation, concentration, and purification, but also the properties of energy efficiency, environmental friendliness, high efficiency, simplicity, manufacturing scalability, small footprint, and ease of operation and control, this technology has been widely used in chemical industry, environmental protection, medicine, food, and desalination. [2,3] Membrane is regarded as a significant method to solve the far-reaching issues such as water shortages, environmental pollution, and energy crisis.Along with the rapid industrialization and sharp increase in population, the problems of water shortages, environmental pollution, and energy crisis become more and more severe and complex, leading to the higher technology requirement for membrane separation. Although the frequently used traditional polymer membrane featured with low cost, good mechanical strength, excellent flexibility, and ease of processing, the two key parameters of permeability and selectivity that are generally used to evaluate membrane separation performance are interinhibitive because of the well-known trade-off effect. [4] One of the main reasons for the trade-off effect is the wide distribution of pore size in polymeric membranes. Therefore, materials with uniform and well-ordered pores are considered as perfect candidates for fabricating highperformance separation membranes. Keeping this in perspective, many meaningful studies have been conducted for constructing homoporous membranes [5] with traditional polymers as starting materials. The obtained membranes have a pore size ranging from 5 to 50 nm and possess great potential for ultrafiltration (UF). [6] However, in some practical application systems such as gas separation, dyes removal, protein and drug recovery as well as desalination, the kinetic dimensions of components to be separated usually are less than 5 nm. Therefore, it is very important that a homoporous structure with a pore size of less than 5 nm is constructed to be used in membrane separation.Covalent organic frameworks (COFs) [7][8][9][10][11] are an emerging class of organic porous crystalline materials with pores that range from 0.5 to 5 nm, [12,13] which are entirely composed by light elements, such as C, H, O, N, B, and Si and are connected by strong covalent bonds. Owing to the unique nature of their well-ordered and tailorable pore channels, high and permanent porosity, excellent thermostability and chemical stability, and ease of functionalization, COF materials have been demonstrated promising potential in many applications, including separation, [14] catalysis, [15] sensor, [16] optoelectronics, [17] energy conversion, [18] and semiconductors, [19] among others. Particularly, these characteristics of COF materials perfectly meet the requirements for making advanced separation membrane. For example, the uniform aperture, high porosity, and excellent stability are beneficial

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Section: Lbl Stackingmentioning

confidence: 99%

Section: Water Treatmentmentioning

confidence: 99%

Covalent Organic Framework Membranes for Efficient Chemicals Separation

et al. 2021

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“…Due to the synergistic effect, the resulting MMMs obtained an extraordinary 6.8-fold flux enhancement while keeping a steady salt rejection rate. Similarly, we reacted COF nanosheets with graphene oxide (GO) nanosheets for the first time to prepare a mixed nanosheet membrane assembled from the reacted two kinds of nanosheets [151]. GO nanosheets have mechanical stability but are non-porous, whereas COF nanosheets are porous.…”

Section: Mixed Matrix Membranes (Mmms)mentioning

confidence: 99%

Structural Characteristics and Environmental Applications of Covalent Organic Frameworks

et al. 2021

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Covalent organic frameworks (COFs) are emerging crystalline polymeric materials with highly ordered intrinsic and uniform pores. Their synthesis involves reticular chemistry, which offers the freedom of choosing building precursors from a large bank with distinct geometries and functionalities. The pore sizes of COFs, as well as their geometry and functionalities, can be pre-designed, giving them an immense opportunity in various fields. In this mini-review, we will focus on the use of COFs in the removal of environmentally hazardous metal ions and chemicals through adsorption and separation. The review will introduce basic aspects of COFs and their advantages over other purification materials. Various fabrication strategies of COFs will be introduced in relation to the separation field. Finally, the challenges of COFs and their future perspectives in this field will be briefly outlined.

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“…Various interesting combinations of nanostructures with different dimensions, including the coupling of 0D/2D nanostructures [ 160 , 161 , 162 , 163 , 164 , 165 , 166 , 167 , 168 , 169 ], 1D/3D nanostructures [ 170 ], 1D/2D nanostructure [ 171 , 172 , 173 ], 3D/2D nanostructures [ 174 , 175 , 176 , 177 , 178 ] have been attempted for liquid separation nanocomposite membranes. A glimpse into these works revealed the huge potential of high surface area 2D nanosheets to serve as a versatile platform for the deposition of other nanostructures while their restacking issue can be simultaneously overcome through the insertion of foreign nanostructures.…”

Section: Synergy Of Multidimensional Hybrid Nanostructuresmentioning

confidence: 99%

Nanocomposite Membranes for Liquid and Gas Separations from the Perspective of Nanostructure Dimensions

2020

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One of the critical aspects in the design of nanocomposite membrane is the selection of a well-matched pair of nanomaterials and a polymer matrix that suits their intended application. By making use of the fascinating flexibility of nanoscale materials, the functionalities of the resultant nanocomposite membranes can be tailored. The unique features demonstrated by nanomaterials are closely related to their dimensions, hence a greater attention is deserved for this critical aspect. Recognizing the impressive research efforts devoted to fine-tuning the nanocomposite membranes for a broad range of applications including gas and liquid separation, this review intends to discuss the selection criteria of nanostructured materials from the perspective of their dimensions for the production of high-performing nanocomposite membranes. Based on their dimension classifications, an overview of the characteristics of nanomaterials used for the development of nanocomposite membranes is presented. The advantages and roles of these nanomaterials in advancing the performance of the resultant nanocomposite membranes for gas and liquid separation are reviewed. By highlighting the importance of dimensions of nanomaterials that account for their intriguing structural and physical properties, the potential of these nanomaterials in the development of nanocomposite membranes can be fully harnessed.

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Mixed Nanosheet Membranes Assembled from Chemically Grafted Graphene Oxide and Covalent Organic Frameworks for Ultra-high Water Flux

Cited by 73 publications

References 60 publications

Covalent Organic Framework Membranes for Efficient Chemicals Separation

Covalent Organic Framework Membranes for Efficient Chemicals Separation

Structural Characteristics and Environmental Applications of Covalent Organic Frameworks

Nanocomposite Membranes for Liquid and Gas Separations from the Perspective of Nanostructure Dimensions

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