A hydrophilic covalent organic framework for photocatalytic oxidation of benzylamine in water

Liu, Ziqian; Su, Qing; Ju, Pengyao; Li, Xiaodong; Li, Guanghua; Wu, Qiaolin; Zhang, Nana

doi:10.1039/c9cc07661a

Cited by 90 publications

(70 citation statements)

References 28 publications

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“…[ 73 ] For example, highly hydrophilic COF material TFPT‐BMTH, with high crystallinity and good chemical stability, exhibited significant catalytic activity in photocatalytic oxidation of benzylamine in water under visible light. [ 74 ] However, the rapid recombination of photoactivated charge carriers is a main inhibiting factor for COFs to display excellent catalytic performance. Taking advantage of their large surface area and abundant functional groups, MOFs could be ideal platforms to hybridize with COFs, forming heterostructures and thus improving the photocatalytic ability.…”

Section: Improving the Selectivity Of Photocatalytic Oxidationmentioning

confidence: 99%

Strategies and Challenges on Selectivity of Photocatalytic Oxidation of Organic Substances

Xiong

Tang

2021

Advanced Energy Materials

316

193

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Most organic compounds are conventionally synthesized under high temperature and elevated pressure, resulting in significant energy consumption and wastage. Heterogeneous photocatalytic oxidation has the potential to provide a green route for the synthesis of the majority of industrially important chemicals. The major limiting factor affecting the efficiency of photocatalytic organic synthesis is the lack of high selectivity; therefore, substantial effort has been devoted to solving this problem. Responding to this fast‐moving progress, this review gives an overview of the fundamental understanding of the reactive oxygen species involved in photocatalytic organic oxidations and furthermore, the general mechanisms of a few crucial oxidation reactions. The focus of this critical review is on the discussion of diverse strategies to improve the selectivity of high value chemicals, including band engineering, metal loading, hybrid materials, and defect engineering, with the primary aim of highlighting the catalyst design protocols based on the reaction mechanism. Finally, the difficulties and challenges of developing highly selective oxidation photocatalysts are comprehensively discussed in order to help direct the focus of future research.

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Section: Improving the Selectivity Of Photocatalytic Oxidationmentioning

confidence: 99%

Strategies and Challenges on Selectivity of Photocatalytic Oxidation of Organic Substances

Xiong

Tang

2021

Advanced Energy Materials

316

193

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“…In photocatalysis, COFs have been mainly limited to hydrogen evolution reaction through water splitting, 9 CO 2 reduction, 10 degradation of organic pollutants, 11 oxidative hydroxylation of arylboronic acids to form phenols, 12 oxidation of anisoles to sulfoxides, 13 reductive dehalogenation of phenacyl bromide, 14 oxidative coupling of amines to imines, 15 etc. To the best of our knowledge, COFs enabling photocatalytic reduction of molecular oxygen to produce H 2 O 2 have not yet been reported.…”

Section: Introductionmentioning

confidence: 99%

Strongly Reducing (Diarylamino)benzene-Based Covalent Organic Framework for Metal-Free Visible Light Photocatalytic H₂O₂ Generation

et al. 2020

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Photocatalytic reduction of molecular oxygen is a promising route toward sustainable production of hydrogen peroxide (H 2 O 2 ). This challenging process requires photoactive semiconductors enabling solar energy driven generation and separation of electrons and holes with high charge transfer kinetics. Covalent organic frameworks (COFs) are an emerging class of photoactive semiconductors, tunable at a molecular level for high charge carrier generation and transfer. Herein, we report two newly designed two-dimensional COFs based on a (diarylamino)benzene linker that form a Kagome ( kgm ) lattice and show strong visible light absorption. Their high crystallinity and large surface areas (up to 1165 m 2 ·g –1 ) allow efficient charge transfer and diffusion. The diarylamine (donor) unit promotes strong reduction properties, enabling these COFs to efficiently reduce oxygen to form H 2 O 2 . Overall, the use of a metal-free, recyclable photocatalytic system allows efficient photocatalytic solar transformations.

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“…Compared with other 2D COFs, hexagonal COFs provide an opportunity to suppress the electrostatic repulsion between the modified organic functional molecules, which is of great benefit for organic modification of COFs to obtain specific function, such as hydrophilic COF 1,3,5‐tris‐(4‐formyl‐phenyl)triazine–2,5‐bis(2‐methoxyethoxy)terephthalohydrazide (TFPT–BMTH) obtained by introducing 2‐methoxyethoxy groups to channel walls. [ 51 ]…”

Section: The Construction Of 2d Cofs For Photocatalysismentioning

confidence: 99%

“…The high crystallinity contributes to facilitating the separation and transfer of the photogenerated electrons, promoting the organic oxidation reaction. [ 41,43,44,126,127 ] In addition, template‐directed synthesis of nanostructured imine‐linked COFs is also a facile strategy to prepare efficient catalysts for photocatalytic oxidation reaction using MOF or mesoporous silica which increase accessible surface area. [ 128,129 ]…”

Section: Photocatalytic Applications Of 2d Cofmentioning

confidence: 99%

Two‐Dimensional Covalent‐Organic Frameworks for Photocatalysis: The Critical Roles of Building Block and Linkage

et al. 2020

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Covalent organic frameworks (COFs) are a class of crystalline porous materials which contain organic build blocks linked via covalent bonds to form ordered and periodic structures. In recent years, 2D COFs have been developed as promising heterogeneous photocatalysts due to their extended π‐conjugated skeletons, high surface area, tunable structure, regular pore structure, and high crystallinity. Herein, recent advances in the design and synthesis of 2D COFs for photocatalysts are surveyed, the illustration of the structural features and synthetic strategy is focused on, and the relationship between the construction and property of 2D COFs for photocatalytic water splitting, CO2 reduction, organic transformation, and degradation of organic pollutants is elucidated. This overview is expected to provide clues to rational design and synthesis of ultra‐stable, high crystalline, and high‐performance 2D COFs for photocatalytic applications.

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A hydrophilic covalent organic framework for photocatalytic oxidation of benzylamine in water

Abstract: The highly hydrophilic COF exhibits superior photocatalytic activity and recyclability together with environmental benignity in photocatalytic oxidation of benzylamine in water under ambient conditions.

Cited by 90 publications

References 28 publications

Strategies and Challenges on Selectivity of Photocatalytic Oxidation of Organic Substances

Strategies and Challenges on Selectivity of Photocatalytic Oxidation of Organic Substances

Strongly Reducing (Diarylamino)benzene-Based Covalent Organic Framework for Metal-Free Visible Light Photocatalytic H₂O₂ Generation

Two‐Dimensional Covalent‐Organic Frameworks for Photocatalysis: The Critical Roles of Building Block and Linkage

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A hydrophilic covalent organic framework for photocatalytic oxidation of benzylamine in water

Abstract: The highly hydrophilic COF exhibits superior photocatalytic activity and recyclability together with environmental benignity in photocatalytic oxidation of benzylamine in water under ambient conditions.

Cited by 90 publications

References 28 publications

Strategies and Challenges on Selectivity of Photocatalytic Oxidation of Organic Substances

Strategies and Challenges on Selectivity of Photocatalytic Oxidation of Organic Substances

Strongly Reducing (Diarylamino)benzene-Based Covalent Organic Framework for Metal-Free Visible Light Photocatalytic H2O2 Generation

Two‐Dimensional Covalent‐Organic Frameworks for Photocatalysis: The Critical Roles of Building Block and Linkage

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Strongly Reducing (Diarylamino)benzene-Based Covalent Organic Framework for Metal-Free Visible Light Photocatalytic H₂O₂ Generation