Covalent Organic Frameworks Constructed from Flexible Building Blocks with High Adsorption Capacity for Pollutants

Abstract

Two imine-based two-dimensional covalent organic frameworks (2D COFs: TPT-Azine-COF and TPT-TAPB-COF) which exhibit large surface areas and good crystallinity were synthesized from flexible building blocks. Both of them exhibit a prominent adsorption capacity for Rhodamine B (970 mg g–1) and volatile iodine (225 wt %) with good recyclability.

Facile Room‐Temperature Synthesis of Novel Porous Three‐Component Hybrid Covalent Organic Polymers and Their Applications towards Sulfadiazine Adsorption

“…Generally, the 2D/3D covalent polymers in two categories of crystalline and amorphous, are constructed from finite mono‐ or bi‐component strategy through limited single B–O/C=N/C–C/N–N linkages, etc . Moreover, the traditional synthetic solvothermal methods for COPs required harsh conditions, for instance, high temperature and pressure, complex operation process and long reaction time . There is no doubt that the challenges proposed on synthesis have prevented COPs from developing and expanding their structural innovation and practicable applications.…”

“…Covalent organic polymers (COPs) composed of light elements (C, H, O, N, B and Si), have been exploited as strong candidates for applying in environment treatment areas, medical care industries and energy‐related domains by virtue of a combination of great chemical stability, high inherent surface area, elaborate structural controllability as well as easy accommodating functionality . Generally, the 2D/3D covalent polymers in two categories of crystalline and amorphous, are constructed from finite mono‐ or bi‐component strategy through limited single B–O/C=N/C–C/N–N linkages, etc .…”

Tailoring Covalent Organic Frameworks To Capture Water Contaminants

“…COFs are usually obtained as low-density powders featuring polydisperse particles with sizes in the micrometer range. Althoughs uch powder can be directly applied for adsorption of contaminants in water using different modalities, such as direct dispersion in sample matrices [35,37,44,47,48,50,51,53,54] or packing into columns, [39,125] using the bulk material could lead to materiall osses, high column backpressure, and difficulties in its isolation from the sample matrix. These are serious limitations, which can hinder the use of COFs in environmental applications.…”

“…The frameworks explored for this applicationh ave typicallyf eatured either tetragonal or hexagonal pores (Scheme 1). Promising results have been obtained for the captureo f, for example, organic dyes, [31][32][33][34][35] perfluoroalkyl substances, [36] aryl-organophosphorous flame retardants, [37] pesticides, [38][39][40] phenol endocrine disruptors, [41,42] lactic acid, [43] iodine, [44,45] mercury, [46][47][48][49] radionuclides, [50] lanthanides, [51] and oil spills. [52] We found COFs to efficiently adsorb biotoxins from seawater [53] andp harmaceuticalc ontaminants from water, [54] expanding their use to these classes of hazardouscompounds.…”

Inorganic and Hybrid (Organic–Inorganic) Lamellar Materials for Heavy metals and Radionuclides Capture in Energy Wastes Management—A Review

“…The technique is based on the split of an element from one system (liquid phase for example) and its concentration in another system (at the surface of a material for example). This approach, mainly used for volatile organic compounds [19], heavy metals and ammonia treatment, is easy to achieve and effective in eliminating poisonous pollutants, at low concentration [20]. The adsorbent choice is one of the most decisive steps in any adsorption mechanism.…”