A 2-Fold Interpenetrated Nitrogen-Rich Metal–Organic Framework: Dye Adsorption and CO₂ Capture and Conversion

Abstract

A bifunctional ligand strategy for modification of the functional pores is of great significance in the structural design of metal−organic frameworks (MOFs). Herein, a new 2-fold interpenetrated "pillared-layer" 3D Co-MOF, {[Co(HL)(4,4′-bipy)]• DMF•2H 2 O} n (1), was successfully synthesized by using two kinds of ligands, imidazolecarboxylic acid and pyridine. The metal− carboxylic layers are pillared by the 4,4′-bipy ligand, displaying a 3D framework with rectangular 3D channels (high BET surface of 190.9 m 2 g −1 and maximum aperture of 3.9 Å) that are decorated with abundant uncoordinated N and O atoms. 1 shows good water stability and thermal stability (320 °C). The proper pores and active sites endowed 1 with a selective adsorption of Congo red in aqueous solution. In addition, a high CO 2 adsorption capacity and an excellent CO 2 chemical conversion were observed.

Bifunctional metal–organic frameworks afforded by postsynthetic modification for efficient cycloaddition of CO2 and epoxides

“…The adsorption curves increase rapidly at lower pressure and follow a type‐I microporous adsorption isotherm at 273 and 298 K with the uptake of 37.8 and 27.4 cm 3 g −1 for 1‐Eu and 19.2 and 15.7 cm 3 g −1 for 1‐Eu ‐MeI, respectively, which is comparable with those of some reported microporous MOFs with unsaturated metal sites, such as the cage‐based MOF (20.0 cm 3 g −1 ) [ 65 ] and Co‐MOF (28.1 cm 3 g −1 ). [ 66 ]…”

Synthesis of a Magnetic Co@C Material via the Design of a MOF Precursor for Efficient and Selective Adsorption of Water Pollutants

“…MOFs are excellent adsorbents and are generally used on account of their speci c surface areas, diverse range of functional groups, and controllable channel sizes. 41,42 Herein, the adsorption properties of dyes from wastewater brought about widespread attention. 43,44 In this study, three cationic dyes [methylene blue (MB), rhodamine B (RhB) and gentian violet (GV)] and two anionic dye (MO and CR) were chosen as models to investigate the adsorption properties of Co-MOF.…”

Selective and Multicyclic CO2 Adsorption with Visible Light-Driven Photodegradation of Organic Dyes in a Robust Metal–Organic Framework Embracing Heteroatom-Affixed Pores

“…According to the Intergovernmental Panel on Climate Change (IPCC), the growing concentration of CO 2 in the atmosphere has been the root cause to global warming. , Significant efforts have been made in developing alternative strategies to stop continued combustion of fossil fuels, but the progress has been anticipated for many years to come, owing to the slow rate of transition toward renewable and clean energy sources. In this milieu, carbon capture and sequestration (CCS) emerged as a promising approach for mitigating the increasing CO 2 accumulation in the atmosphere. , However, major drawbacks of conventionally used aqueous alkanolamine solutions include their hazardous and corrosive nature, high energy requirement for adsorbent regeneration, chemical interaction between CO 2 and alkaline solutions ( Q st ∼ 50–100 kJ/mol), and leakage of the toxic amine gas to air. , In this milieu, MOFs emerged as an excellent alternative to traditional alkaline solution by means of physisorption and further address the limitations possessed by other state-of-the-art porous materials used in this avenue. − These crystalline hybrids can be rationally designed through the incorporation of built-in polar atoms, wherein employment of N-rich ligands helps modulate the pore electronic environment for a suitable interaction with incoming CO 2 gas molecules. − However, deliberate integration of task-specific polar sites inside the MOF pores is quite challenging, as they may either do not precisely line through the channels or considerably block the void space, in addition to the fact that accessible nitrogen atoms often tend to coordinate with the metal ion. − …”