Construction of a cationic organic network for highly efficient removal of anionic contaminants from water

Li, Zhi Jun; Xue, H. Q.; Zhang, Yuquan; Hu, Huaisheng; Zheng, Xudong

doi:10.1039/c9nj00886a

Cited by 24 publications

(13 citation statements)

References 46 publications

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“…To gain insight into the role of hydrogen bonding interactions within trimesic amide in the formation of infinite 2D polymeric structure, cationic COP 2 without any hydrogen bonding based on the polymerization of C 3 -symmetric 1,3,5-tris(4-pyridylethynyl)benzene (TPB) was prepared . As expected, 2 formed into randomly interconnected isotropic spherical aggregates, which was confirmed by DLS, zeta potential, SEM, and TEM (Figure S6).…”

Section: Resultsmentioning

confidence: 99%

“…10,11 Among aforementioned materials, cationic COPs are the most widespread adsorbent due to their simple preparation, high dispersity, as well as large surface area. 12,13 Although linear, cross-linked, and branched cationic polymers with remarkably enhanced removal capacity for anionic pollutants have been employed, part of the cationic sites are hidden by randomly interconnected polymeric chains, which cause the reduced adsorption ability. Two-dimensional (2D) cationic polymers are one of the promising candidates due to their high surface area, 14 but 2D cationic polymerization is challenging to realize without a special template.…”

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confidence: 99%

“…Because of its strong interaction with water, anionic pollutants are challenging to deal with and have raised concerns about the potential adverse impacts on water ecosystem and human health. − As a result, the adsorbents with opposite charge including cationic resins, covalent organic polymers (COPs) , and ordered mesoporous frameworks such as metal–organic frameworks and covalent organic frameworks , are actively investigated as advanced sorbents for pollutant extraction and preconcentration. Commonly, the adsorbents with denser cations on the surface are preferred for efficient adsorption by virtue of the strong electrostatic interaction with anionic pollutants. , Among aforementioned materials, cationic COPs are the most widespread adsorbent due to their simple preparation, high dispersity, as well as large surface area. , Although linear, cross-linked, and branched cationic polymers with remarkably enhanced removal capacity for anionic pollutants have been employed, part of the cationic sites are hidden by randomly interconnected polymeric chains, which cause the reduced adsorption ability.…”

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confidence: 99%

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Two-Dimensional Cationic Networks and Their Spherical Curvature with Tunable Opening–Closing

Zhang

Huang

et al. 2019

Nano Lett.

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Despite many cationic nanomaterials that have been developed for efficient adsorption of anionic pollutants, tailoring a stable shape with denser cations on the surface for advanced removal capability remains challenging. Here, a new strategy is presented for fabricating two-dimensional (2D) cationic laminas and their curvature based on cross-linking of 2D supramolecular networks from hydrogen-bonded trimesic amide derivatives. Owing to the distribution of most cations on the surface, two cationic nanostructures from cross-linking of supramolecular networks show fast sorption kinetics for anionic pollutants. Notably, the removal capacity of the capsule-like curvature adsorbent is more than twice that of lamina adsorbent for sufficient space around cationic sites in hollow aperture. Moreover, the capsule-like adsorbent is triggered to open and spontaneously release the adsorbed pollutants upon the addition of halogen anions, which can be recovered by subsequent dialysis. Strategy of a capsule-like pocket with tunable opening−closing will provide a new insight for storage and adsorption.

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Section: Resultsmentioning

confidence: 99%

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confidence: 99%

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confidence: 99%

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Two-Dimensional Cationic Networks and Their Spherical Curvature with Tunable Opening–Closing

Zhang

Huang

et al. 2019

Nano Lett.

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“…Several other studies have also been reported regarding the adsorption of different dyes, originating mainly from the paper, paint and clothing industries, namely, Congo red (CR), methyl orange (MO), orange G (OG) and indigo carmine (IC). Polycationic COFs were synthesized for the removal of anionic dyes, with excellent adsorption capacities and recyclability [ 73 , 74 ], as well as COFs functionalized with electron-withdrawing groups for the adsorption of cationic dyes [ 75 ] and COFs impregnated with metal ions to promote favorable metal-dye coordination interactions [ 76 ].…”

Section: Cof Applicationsmentioning

confidence: 99%

Covalent Organic Frameworks: Synthesis, Properties and Applications—An Overview

et al. 2021

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Covalent Organic Frameworks (COFs) are an exciting new class of microporous polymers with unprecedented properties in organic material chemistry. They are generally built from rigid, geometrically defined organic building blocks resulting in robust, covalently bonded crystalline networks that extend in two or three dimensions. By strategically combining monomers with specific structures and properties, synthesized COF materials can be fine-tuned and controlled at the atomic level, with unparalleled precision on intrapore chemical environment; moreover, the unusually high pore accessibility allows for easy post-synthetic pore wall modification after the COF is synthesized. Overall, COFs combine high, permanent porosity and surface area with high thermal and chemical stability, crystallinity and customizability, making them ideal candidates for a myriad of promising new solutions in a vast number of scientific fields, with widely varying applications such as gas adsorption and storage, pollutant removal, degradation and separation, advanced filtration, heterogeneous catalysis, chemical sensing, biomedical applications, energy storage and production and a vast array of optoelectronic solutions. This review attempts to give a brief insight on COF history, the overall strategies and techniques for rational COF synthesis and post-synthetic functionalization, as well as a glance at the exponentially growing field of COF research, summarizing their main properties and introducing the numerous technological and industrial state of the art applications, with noteworthy examples found in the literature.

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“…, dexamethasone derivatives) − and pollutants ( e.g. , toxic oxo-anions and dyes) − are highly demanded; however, such structures are rarely reported compared to the anionic and neutral frameworks.…”

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confidence: 99%

Active Anion Delivery by Self-Propelled Microswimmers

et al. 2020

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Self-propelled micro-and nanomachines are at the forefront of materials research, branching into applications in biomedical science and environmental remediation. Cationic frameworks enabling the collection and delivery of anionic species (A − ) are highly required, due to the large variety of lifethreatening pollutants, such as radioactive technetium and carcinogenic chromium, and medicines, such as dexamethasone derivatives with negative charges. However, such autonomous moving carriers for active transport of the anions have been barely discussed. A polymeric viologen (PV ++ )consisting of electroactive bicationic subunitsis utilized in a tubular autonomous microswimmer to selectively deliver A − of different sizes and charge densities. The cargo loading is based on a facile anion exchange mechanism. The packed crystal structure of PV ++ allows removal of an exceptionally high quantity of anions per one microswimmer (2.55 × 10 −13 mol anions per microswimmer), a critical factor often neglected regarding the real-world application of microswimmers. Notably, there was virtually no leakage of anions during the delivery process or upon keeping the loaded microswimmers under ambient conditions for at least 4 months. Multiple release mechanisms, compatible with different environments, including electrochemical, photochemical, and a metathesis reaction, with high efficiencies up to 98% are introduced. Such functional autonomous micromachines provide great promise for the next generation of functional materials for biomedical and environmental applications.

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Construction of a cationic organic network for highly efficient removal of anionic contaminants from water

Abstract: A new cationic organic network is constructed by a facile method from commercially available precursors, and exhibits high efficiency for removal of water contaminants.

Cited by 24 publications

References 46 publications

Two-Dimensional Cationic Networks and Their Spherical Curvature with Tunable Opening–Closing

Two-Dimensional Cationic Networks and Their Spherical Curvature with Tunable Opening–Closing

Covalent Organic Frameworks: Synthesis, Properties and Applications—An Overview

Active Anion Delivery by Self-Propelled Microswimmers

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