Covalent organic frameworks (COFs) for environmental applications

Wang, Jianlong; Zhuang, Shuting

doi:10.1016/j.ccr.2019.213046

Cited by 474 publications

(184 citation statements)

References 130 publications

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“…[5,7] The main fields of application include gas capture, [8] separation and storage, [9][10][11] biomedicine, [12,13] drug delivery, [14,15] catalysis, [16,17] energy storage, [8,18] optoelectronic devices, [19] sample pretreatment, [20] chromatographic separation, [21] and sensing, [22] among other applications. [23][24][25] Depending on the COFs' applicability, their porosity, functionalization, and structure must be carefully designed. Consequently, there are different synthetic perspectives including solvothermal, ionothermal, mechanochemical, sonochemical, and microwave methods for successful COF synthesis.…”

Section: Introductionmentioning

confidence: 99%

Microwave‐Assisted Synthesis of Covalent Organic Frameworks: A Review

et al. 2020

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Covalent organic frameworks (COFs) are relatively recent materials. They have received great attention due to their interesting properties. However, the application of microwaves in their synthesis, despite its advantages such as faster and more reproducible processes, is a minority. Herein, a comprehensive compilation of the research results published in the microwave‐assisted synthesis (MAS) of COFs is presented. This review includes articles of 2D and 3D COFs prepared using microwaves as source of energy. The articles have been classified depending on the functional groups including boronate ester, imines, enamines, azines, and triazines, among others. It compiles the main parameters of synthesis and characteristics of the materials together with some general issues related with COFs and microwaves. Additionally, current and future perspectives of the topic have been discussed.

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Section: Introductionmentioning

confidence: 99%

Microwave‐Assisted Synthesis of Covalent Organic Frameworks: A Review

et al. 2020

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“…Second, while some COFs such as those of boron-based, show poor stability in water and acidic/alkaline solutions, a large selection of other 2D COFs demonstrate good stability in both aqueous and organic media due to their strong covalent bonds. [86,87] In particular, 2D COFs, such as those of imine-based, hydrazinelinked, and ketoneamine-linked, show outstanding stability in organic solvents. [35] Third, 2D COFs have tunable physicochemical properties, which can be engineered by introducing different organic building blocks.…”

Section: Covalent Organic Frameworkmentioning

confidence: 99%

2D Material Based Advanced Membranes for Separations in Organic Solvents

Sui

Yuan

et al. 2020

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2D materials have shown high potentials for fabricating next‐generation membranes. To date, extensive studies have focused on the applications of 2D material membranes in gas and aqueous media. Recently, compelling opportunities emerge for 2D material membranes in separation applications in organic solvents because of their unique properties, such as ultrathin mono‐ to few‐layers, outstanding chemical resistance toward organic solvents. Hence, this review aims to provide a timely overview of the current state‐of‐the‐art of 2D material membranes focusing on their applications in organic solvent separations. 2D material membranes fabricated using graphene materials and a few representative nongraphene‐based 2D materials, including covalent organic frameworks and MXenes, are summarized. The key membrane design strategies and their effects on separation performances in organic solvents are also examined. Last, several perspectives are provided in terms of the critical challenges for 2D material membranes, including standardization of membrane performance evaluation, improving understandings of separation mechanisms, managing the trade‐off of permeability and selectivity, issues related to application versatility, long‐term stability, and fabrication scalability. This review will provide a useful guide for researchers in creating novel 2D material membranes for advancing new separation techniques in organic solvents.

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“…Covalent organic frameworks (COFs), a new class of multifunctional porous crystalline materials, are two- or three-dimensional (2D or 3D) porous crystalline materials built by light elements (C, B, O, Si, and N) via strong covalent bonds (C-N, C=N, C=C-N, B-O) (Xue et al, 2017 ; Chen et al, 2019 ; Wang and Zhuang, 2019 ; Zhu et al, 2019 ). Since the first report in 2005 by Cote et al ( 2005 ), COFs have attracted more and more attention due to their fascinating properties, and many novel COFs have been synthesized (Waller et al, 2015 ; Lohse and Bein, 2018 ).…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Sensors Based on Covalent Organic Frameworks: A Critical Review

et al. 2020

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The metal-free cousins of metal-organic frameworks, covalent organic frameworks (COFs), are a class of pre-designable crystalline polymers composed of light elements and connected by strong covalent bonds. COFs are being given more and more attention in the electrochemical sensor field due to their fascinating properties, such as highly tunable porosity, intrinsic chemical and thermal stability, structural diversity, large specific surface area, and unique adsorption characteristics. However, there are still some key issues regarding COFs that need to be urgently resolved before they can be effectively applied in electrochemical sensing. In this review, we summarized recent achievements in developing novel electrochemical sensors based on COFs, and discussed the key fundamental and challenging issues that need to be addressed, including the mechanisms underlying charge transport, methods to improve electrical conductivity, immobilization methods on different substrates, synthesis strategies for nanoscale COFs, and the application of COFs in different fields. Finally, the challenges and outlooks in this promising field are tentatively proposed.

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Covalent organic frameworks (COFs) for environmental applications

Cited by 474 publications

References 130 publications

Microwave‐Assisted Synthesis of Covalent Organic Frameworks: A Review

Microwave‐Assisted Synthesis of Covalent Organic Frameworks: A Review

2D Material Based Advanced Membranes for Separations in Organic Solvents

Electrochemical Sensors Based on Covalent Organic Frameworks: A Critical Review

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