Freestanding Hydrophilic/Hydrophobic Janus Covalent Organic Framework Membranes for Highly Efficient Solar Steam Generation

Jia, Shaofeng; Hao, Liqin; Liu, Yujie; Lin, En; Liu, Wansheng; Yang, Yi; Tian, Yongjun; Peng, Yun‐Lei; Cheng, Peng; Chen, Yao; Zhang, Zhenjie

doi:10.1021/acsmaterialslett.2c01056

Cited by 26 publications

(12 citation statements)

References 55 publications

(102 reference statements)

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“…Due to the existence of the photoresponsive azo benzene (azo) groups on the COF skeletons, TpAzo, NKCOF-1, NKCOF-60, and NKCOF-61 gels could serve as excellent light absorption and photothermal conversion materials (Figure ). COF hydrogels were prepared via solvent exchange and were then used for the following studies. Ultraviolet–visible near–infrared (UV–vis–NIR) absorption spectra were measured to investigate the light absorption ability of the gels.…”

Section: Results and Discussionmentioning

confidence: 99%

A General Group-Protection Synthesis Strategy to Fabricate Covalent Organic Framework Gels

Jia,

Liu,

Hao

et al. 2023

J. Am. Chem. Soc.

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Section: Results and Discussionmentioning

confidence: 99%

A General Group-Protection Synthesis Strategy to Fabricate Covalent Organic Framework Gels

Jia,

Liu,

Hao

et al. 2023

J. Am. Chem. Soc.

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“…To solve the problems of complex operation and material layering, we designed and synthesized a series of sturdy, porous, azo-rich COFs (NKCOF-47, -48, -49, and -50). 60 The NKCOF-47 film exhibited an excellent evaporation rate of 2.85 kg/m 2 /h and exhibited excellent long-term stability in solar steam power generation (Figure 14a−e). The vapor generation rate of NKCOF-47 film under 1 sun irradiation is as high as 3.02 kg/m 2 /h, and the energy conversion efficiency is as high as 94%, which is the best among all solar thermal evaporators that use COFs as solar thermal materials (Figure 14h).…”

Section: Water Treatmentmentioning

confidence: 99%

Designing and Molding Covalent Organic Frameworks for Separation Applications

Wang,

Yang,

Zhang

2023

Acc. Mater. Res.

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Conspectus Separation processes hold a pivotal role not only in the modern chemical industry but also in our daily lives. Yet, conventional separation methods have been synonymous with excessive energy consumption, exacerbating global environmental concerns. Therefore, exploring alternative separation technologies with low energy consumption and environmental friendliness is of great significance and in urgent demand. Porous materials have emerged as a beacon of hope in this regard, offering superior energy efficiency, minimal environmental impact, and scalability. Presently, porous polymeric materials have found extensive use in separation applications. However, a significant drawback lies in the amorphous nature of traditional polymers, making precise control over their pore architecture at the molecular level a daunting task. Additionally, deciphering their intricate structures for a comprehensive understanding of the structure–function relationship presents challenges. Recently, porous framework polymers represented by covalent organic frameworks (COFs) have emerged as a new class of crystalline porous polymers that features low densities, well-defined structures, high surface areas, adjustable pore sizes, and facilely tailored functionality, thus exhibiting huge potential in the field of separations. Furthermore, the defined crystal structures and precise regulation of the pore environment render COFs perfect platforms for investigating separation mechanisms and structure–function relationships. Regrettably, despite their immense potential in separation applications, COFs face significant challenges. (1) Many reported COFs have pores larger than 1 nm or lack the specific binding sites essential for separating small molecules, particularly gases, which limits their effectiveness in gas separation processes. (2) Conventional synthesis methods, like solvothermal techniques, often yield powdery COF samples, posing difficulties in molding them for practical applications. (3) The large-scale, cost-effective production of high-quality COFs that meet the rigorous demands of industrial applications remains an underexplored frontier. These persistent challenges underscore the need for innovative research and development efforts to unleash the full potential of COFs in addressing critical separation challenges and advancing industrial processes. Addressing the above challenges, in this Account, we mainly summarize the recent research progress achieved by our team, including the following: (i) designing various COFs as highly efficient separators via synthesis strategies, such as generating a penetrated structure, introducing binding sites, and adjusting the pore size; (ii) creating various molding strategies including a cross-linking strategy, nanotape strategy, and melt polymerization strategy to fabricate COFs into membranes or monoliths; (iii) exploring the separation application scopes of COFs, such as gas separation, pollutant removal, and water treatment. And, we point out the existing challenges and future devel...

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“…Nowadays, there is a contradiction between the demand and accessibility for clean water resource owing to the rapid advancement of civilization. Effective use of the abundant seawater resources on earth is a viable way to tackle the scarcity of water crisis. − Among a variety of technologies for seawater purification, solar vapor generation could be more efficient and reliable given that solar power is the only energy source needed, which is in line with environmental protection and sustainable development. − In the past decade, research on interfacial solar vapor generation has made remarkable achievements in enhancing the efficiency of water production and realizing salt resistance during long-term use, which further increases the possibility of moving the technology toward practical application. − …”

Section: Introductionmentioning

confidence: 99%

Engineering Hierarchically Structured Nanofibrous Aerogels for Highly Efficient Solar Vapor Generation and Desalination

Liu

et al. 2023

ACS Sustainable Chem. Eng.

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Electrospun nanofiber-based evaporators have emerged as advanced candidates in the field of solar-driven desalination, stemming from their favorable flexibility, high porosity, and ease of functionalization. Herein, a novel and facile template-free method is developed for preparing polypyrrole nanorod-adorned nanofibrous aerogels, which are reliable and efficient for solar desalination. More notably, polypyrrole plays a crucial cross-linking role in promoting structural stability, avoiding the use of harmful cross-linkers. The presence of polypyrrole nanorods has further augmented light absorption, decreased vaporization enthalpy, and enhanced evaporation performance with an optimal evaporation rate of 2.37 kg m–2 h–1. In addition, the hierarchically structured nanofibrous aerogel enables durable and stable evaporation out of high-concentration brines, superior to most of the electrospun nanofiber-based evaporators. Taking advantage of the excellent photothermal property, the aerogel assembled with a thermoelectric generator can obtain 58.59 mV voltage output under one sun illumination. The exceptional aerogel holds great potential in harnessing solar energy to address the issue of water and energy scarcity.

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Freestanding Hydrophilic/Hydrophobic Janus Covalent Organic Framework Membranes for Highly Efficient Solar Steam Generation

Cited by 26 publications

References 55 publications

A General Group-Protection Synthesis Strategy to Fabricate Covalent Organic Framework Gels

A General Group-Protection Synthesis Strategy to Fabricate Covalent Organic Framework Gels

Designing and Molding Covalent Organic Frameworks for Separation Applications

Engineering Hierarchically Structured Nanofibrous Aerogels for Highly Efficient Solar Vapor Generation and Desalination

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