Porous organic materials for iodine adsorption

Journal of Hazardous Materials, Journal Year: 2023, Volume and Issue: 458, P. 131835 - 131835

Published: June 12, 2023

Language: Английский

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Ordered Macro–Microporous Single Crystals of Covalent Organic Frameworks with Efficient Sorption of Iodine

Journal of the American Chemical Society, Journal Year: 2023, Volume and Issue: 145(4), P. 2544 - 2552

Published: Jan. 20, 2023

Fashioning microporous covalent organic frameworks (COFs) into single crystals with ordered macropores allows for an effective reduction of the mass transfer resistance and maximum preservation their intrinsic properties but remains unexplored. Here, we report first synthesis three-dimensional (3D) macroporous imine-linked 3D COFs (COF-300 COF-303) via a template-assisted modulated strategy. In this strategy, crystallized within sacrificial colloidal crystal template, assembled from monodisperse polystyrene microspheres, underwent aniline-modulated amorphous-to-crystalline transformation to form large interconnected macropores. The effects introduced structure on sorption performances COF-300 were further probed by iodine. Our results indicate that iodine adsorption occurred in micropores not Accordingly, capacity COF was governed micropore accessibility. relatively long diffusion path non-macroporous resulted limited accessibility (48.4%) thus low (1.48 g·g-1). introduction can greatly shorten render all fully accessible (3.15 g·g-1) coincides well theoretical one.

Language: Английский

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Linkage conversions in single-crystalline covalent organic frameworks

Nature Chemistry, Journal Year: 2023, Volume and Issue: 16(1), P. 114 - 121

Published: Sept. 18, 2023

Language: Английский

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Nonporous amorphous superadsorbents for highly effective and selective adsorption of iodine in water

Nature Communications, Journal Year: 2023, Volume and Issue: 14(1)

Published: Sept. 4, 2023

Adsorbents widely utilized for environmental remediation, water purification, and gas storage have been usually reported to be either porous or crystalline materials. In this contribution, we report the synthesis of two covalent organic superphane cages, that are as nonporous amorphous superadsorbents aqueous iodine adsorption with record-breaking capability selectivity. static system, cages exhibit uptake capacity up 8.41 g g-1 in I2 solution 9.01 I3- (KI/I2) solution, respectively, even presence a large excess competing anions. dynamic flow-through experiment, can reach 3.59 5.79 g-1, respectively. Moreover, these able remove trace media from ppm level (5.0 ppm) down ppb concentration (as low 11 ppb). Based on binding-induced mechanism, such molecular materials prove superior all existing adsorbents. This study open new avenue development state-of-the-art practical uses conceptionally (NAS).

Language: Английский

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Construction of Crystalline Nitrone-Linked Covalent Organic Frameworks Via Kröhnke Oxidation

Journal of the American Chemical Society, Journal Year: 2023, Volume and Issue: 145(28), P. 15465 - 15472

Published: July 7, 2023

Developing diverse synthetic routes to prepare various crystalline covalent organic frameworks (COFs) and enrich the family of COFs is very important highly desirable. In this research, we demonstrate that Kröhnke oxidation (originally developed carbonyl compounds) can be employed as an efficient method construct two nitrone-linked (CityU-1 CityU-2) through ingenious design polynitroso-containing precursors well exquisite control polymerization conditions. The formation structure nitrone-based linkage units have been confirmed a mode reaction. as-obtained characterized by Fourier transform infrared X-ray photoelectron spectroscopy, powder diffraction patterns, scanning electron microscopy. Notably, CityU-1 exhibits BET specific surface area 497.9 m2g-1 with I2 capture capacity 3.0 g g-1 at 75 °C. Our research would provide more chances for applications.

Language: Английский

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Effective Iodine Adsorption by Nitrogen-Rich Nanoporous Covalent Organic Frameworks

ACS Applied Nano Materials, Journal Year: 2023, Volume and Issue: 6(2), P. 1295 - 1302

Published: Jan. 11, 2023

With the rapid development of nuclear industry, effective treatment radioactive iodine has currently become an urgent but challenging task. Herein, two covalent organic frameworks (COFs), TFBT-1 and TFBT-2, were successfully synthesized for adsorption. Structure analysis revealed that they are both nanoporous materials with one-dimensional channels derived from packing related two-dimensional frameworks. Iodine adsorption experiments demonstrated COF exhibit performance adsorption, a maximum amount upto 3.15 g g–1 2.60 TFBT-2. The results experimental analyses Fourier-transform infrared spectroscopy, X-ray photoelectron Raman spectroscopy clearly their high is attributed to strong interactions between adsorbed uniformly located abundant nitrogen sites in pores materials, which pre-introduced acylamides situ-generated Schiff base imine groups. present work by introducing nitrogen-rich into adsorbents can be achieved.

Language: Английский

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From Supramolecular Organic Cages to Porous Covalent Organic Frameworks for Enhancing Iodine Adsorption Capability by Fully Exposed Nitrogen‐Rich Sites

Small, Journal Year: 2023, Volume and Issue: 19(34)

Published: May 10, 2023

In order to overcome the limitations of supramolecular organic cages for their incomplete accessibility active sites in solid state and uneasy recyclability liquid solution, herein a nitrogen-rich cage is rationally linked into framework systems four isoreticular covalent frameworks (COFs), that is, Cage-TFB-COF, Cage-NTBA-COF, Cage-TFPB-COF, Cage-TFPT-COF, are successfully synthesized. Structure determination reveals they all high-quality crystalline materials derived from eclipsed packing related two-dimensional frameworks. Since usually have high affinity toward iodine species, adsorption investigations carried out results show them display an enhancement capacities. Especially, Cage-NTBA-COF exhibits capacity 304 wt%, 14-fold higher than sample packed itself. The strong interactions between adsorbed species revealed by spectral analyses. This work demonstrates that, utilizing reticular chemistry strategy extend close-packed porous solids, inherent properties can be greatly exploited targeted applications.

Language: Английский

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Recent progress of radionuclides separation by porous materials

Science China Chemistry, Journal Year: 2024, Volume and Issue: 67(11), P. 3515 - 3577

Published: Sept. 26, 2024

Language: Английский

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Linking Nitrogen-Rich Organic Cages into Isoreticular Covalent Organic Frameworks for Enhancing Iodine Adsorption Capability

ACS Materials Letters, Journal Year: 2023, Volume and Issue: 5(6), P. 1546 - 1555

Published: April 24, 2023

By linking a nitrogen-rich organic cage with linear connectors, three cage-based isoreticular covalent frameworks, i.e., Cage-IRCOF-1, Cage-IRCOF-2, Cage-IRCOF-3, were successfully designed and synthesized by Schiff-base polycondensation reactions. The structure determination simulations from powder X-ray diffraction measurements indicated that these COFs have high crystallinity derived the packing of covalently linked two-dimensional layer frameworks. As porous materials, iodine capture studies carried out, proving they displayed obvious enhancements in uptake as compared pristine itself. In particular, Cage-IRCOF-1 an adsorption capacity 262 wt %, which is 12 times higher than solid packed Spectral revealed there strong interactions between groups adsorbed species. This work demonstrated discrete cages into reticular crystalline effective adsorbents can be fabricated for targeted applications.

Language: Английский

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Engineering the pore environment of antiparallel stacked covalent organic frameworks for capture of iodine pollutants

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: March 26, 2024

Abstract Radioiodine capture from nuclear fuel waste and contaminated water sources is of enormous environmental importance, but remains technically challenging. Herein, we demonstrate robust covalent organic frameworks (COFs) with antiparallel stacked structures, excellent radiation resistance, high binding affinities toward I 2 , CH 3 I, − under various conditions. A neutral framework (ACOF-1) achieves a affinity through the cooperative functions pyridine-N hydrazine groups stacking layers, resulting in capacity ~2.16 g/g for ~0.74 at 25 °C dynamic adsorption Subsequently, post-synthetic methylation ACOF-1 converted sites to cationic pyridinium moieties, yielding (namely ACOF-1R) enhanced triiodide ion water. ACOF-1R can rapidly decontaminate iodine polluted groundwater drinking levels uptake ~4.46 established column breakthrough tests. The specific moieties make promising adsorbents radioiodine pollutants treatment practical

Language: Английский

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