Covalent organic framework membranes with limited channels filling through in-situ grown polyaniline for efficient dye nanofiltration

Mao, Chenyue; Zhao, Song; He, Pengpeng; Wang, Zhi; Wang, Jixiao

doi:10.1016/j.cej.2021.128929

Cited by 51 publications

(12 citation statements)

References 47 publications

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“…It can be seen from the infrared spectrum that the C—N vibration peak for N—Ph—N appears at 1306 cm −1 of the PANI/PEEK film. [ 52 , 53 , 54 , 55 ] As shown in Figure S3 , Supporting Information, the film treated with a single hydrochloric acid can only become PEEK, and the group of the film treated with a single oxidation has not changed, which shows that the synergistic effect of hydrochloric acid and ammonium persulfate promotes the formation of the PANI/PEEK composite film.…”

Section: Resultsmentioning

confidence: 97%

Based On Confined Polymerization: In Situ Synthesis of PANI/PEEK Composite Film in One‐Step

et al. 2021

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Confined polymerization is an effective method for precise synthesis, which can further control the micro-nano structure inside the composite material. Polyaniline (PANI)-based composites are usually prepared by blending and original growth methods. However, due to the strong rigidity and hydrogen bonding of PANI, the content of PANI composites is low and easy to agglomerate. Here, based on confined polymerization, it is reported that polyaniline /polyether ether ketone (PANI/PEEK) film with high PANI content is synthesized in situ by a one-step method. The micro-nano structure of the two polymers in the confined space is further explored and it is found that PANI grows in the free volume of the PEEK chain, making the arrangement of the PEEK chain more orderly. Under the best experimental conditions, the prepared 16 μm-PANI/PEEK film has a dielectric constant of 205.4 (dielectric loss 0.401), the 75 μm-PANI/PEEK film has a conductivity of 3.01×10 −4 S m −1 . The prepared PANI/PEEK composite film can be further used as electronic packaging materials, conductive materials, and other fields, which has potential application prospects in anti-static, electromagnetic shielding materials, corrosion resistance, and other fields.

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Section: Resultsmentioning

confidence: 97%

Based On Confined Polymerization: In Situ Synthesis of PANI/PEEK Composite Film in One‐Step

et al. 2021

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“…A sustainable crystalline lattice could construct beneficial domains, and tailorable units could afford specific decoration . What is more, the linkage of covalent bonds provides strong molecular-level stability to endow durability . As for ion transport utilization, the COFs could be considered to conveniently transfer ions as ionic conductors with in situ chemical protection design.…”

Section: Introductionmentioning

confidence: 99%

Alkali-Durable Covalent Organic Frameworks Carrying In Situ Ammonium as an Ionic Conductor toward Hydroxide Transport

Yang

Zhang

2022

ACS Sustainable Chem. Eng.

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Durable transport of hydroxide ions is currently required to develop alkaline electrolyzers for efficient and clean hydrogen production. In the present work, a self-standing TAPA-TFP covalent organic framework (COF) membrane is obtained by oil–water interface polymerization. It is subsequently ionized through in situ ammonium groups via Menshutkin reactions to prepare a N+-COF ionic conductor. Based on the strategy of charge delocalization, the symmetric benzene around the in situ ammonium in the N+-COF ionic conductor could protect the cations from alkali degradation. Meanwhile, the micro-ordered alignment of cationic clusters endows the N+-COF ionic conductor with desirable hydroxide ion conductivities of up to 54 mS·cm–1 at 80 °C with an ion exchange capacity of 1.54 meq·g–1. Furthermore, when this N+-COF ionic conductor acts as a potential anion exchange membrane (AEM), it shows that water uptake and dimensional changes remain equalized between hydrophilicity and structural stability. It has been found that the N+-COF membrane has excellent alkaline stability through 1H nuclear magnetic resonance analysis, showing slight degradation of the cations after immersion in 1 M NaOH at 80 °C for 30 days. The alkaline stability and high conductivity of the N+-COF ionic conductor highlight its prospects as an AEM to be further applied in continuous water electrolysis, alkaline fuel cells, and hydrogen development.

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“…COFs have good potential for application as adsorbents in the field of sample pretreatment owing to their high specific surface area, rich functional group properties, and excellent stability in harsh environments. , Recently, different types of COFs have been used as adsorbents for the enrichment of metal ions, , environmental pollutants, , dyes, peptides, large biological molecules, bioactive components from natural medicines, etc. To the best of our knowledge, there are only few reports of the application of COFs in the separation and enrichment of bioactive components from natural medicines. − In recent years, the study of the application of bioactive components as therapeutic agents, such as cancer therapeutic agents and antiobesity agents, has attracted increasing attention.…”

Section: Introductionmentioning

confidence: 99%

High-Crystallinity Covalent Organic Framework Synthesized in Deep Eutectic Solvent: Potentially Effective Adsorbents Alternative to Macroporous Resin for Flavonoids

et al. 2021

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A critical challenge in the enrichment of active ingredients in natural medicines is the design of adsorbents with high selectivity and adsorption capacity. Covalent organic frameworks (COFs), which have adjustable pores and high specific surface areas, could be effective as adsorbents for active ingredients. This study used an environmentally friendly deep eutectic solvent (DES) instead of organic solvents as the reaction solvent, and high-crystallinity COF-DES was successfully prepared. The COF-DES fabricated using 1,3,5-tris(4-aminophenyl)benzene and 2,5-dihydroxyterephthalaldehyde as building blocks showed good dispersibility, large surface area (444.56 m 2 •g −1 ), and suitable pore size (25.9 Å). Owing to its unique structure and functional group properties, COF-DES can prevent interferences from other compounds such as alkaloids, resulting in outstanding selective adsorption performance for flavonoids. Furthermore, under optimized adsorption conditions, the adsorption effects of the COF-DES on flavonoids were much better than those of the effects of macroporous resins, indicating the potential of the COF-DES as a selective adsorbent for flavonoids. Finally, a flavonoid-possessing rich natural medicine, Abelmoschus manihot (Linn.) Medicus flower, was used as a sample to study the application potential of the COF-DES. The results showed that the COF-DES had good adsorption and selection capability for flavonoids in actual samples. Moreover, compared with solid-phase extraction (SPE) columns based on macroporous resins, a COF-DES based SPE column showed superior adsorption performance for an actual complex sample, indicating the potential to COF-DES as an effective adsorbent alternative to macroporous resins. Additionally, the COF-DES had great commercial value as an adsorbent for SPE flavonoid columns.

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Covalent organic framework membranes with limited channels filling through in-situ grown polyaniline for efficient dye nanofiltration

Cited by 51 publications

References 47 publications

Based On Confined Polymerization: In Situ Synthesis of PANI/PEEK Composite Film in One‐Step

Based On Confined Polymerization: In Situ Synthesis of PANI/PEEK Composite Film in One‐Step

Alkali-Durable Covalent Organic Frameworks Carrying In Situ Ammonium as an Ionic Conductor toward Hydroxide Transport

High-Crystallinity Covalent Organic Framework Synthesized in Deep Eutectic Solvent: Potentially Effective Adsorbents Alternative to Macroporous Resin for Flavonoids

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