In Situ Synthesis of NH₂-MIL-53-Al/PAN Nanofibers for Removal Co(II) through an Electrospinning Process

Abstract

In this study, researchers developed a novel composite material called NH 2 -MIL-53-Al/PAN, which consists of metal−organic frameworks (MOFs) grown on electrospun PAN nanofibers (NFs). The successful formation of the composite was confirmed by X-ray diffraction (XRD) and Fourier transform infrared (FTIR), and the hydrophilicity of NH 2 -MIL-53-Al/PAN was demonstrated by the water contact angle (WCA). Batch experiments were conducted to investigate the adsorption performance of Co(II) under different conditions. The maximum adsorption capacity reached 58.72 mg/g, and almost 95% of the adsorption was achieved within the first 6 h. The adsorption process was found to be spontaneous and endothermic and followed the pseudo-second-order kinetics and Langmuir models. Chemisorption and molecular layer adsorption are the main mechanisms of adsorption, and X-ray photoelectron spectroscopy (XPS) analysis further reveals that the interaction between the adsorbent and cobalt is a coordination interaction. In this study, NH 2 -MIL-53-Al was grown in situ on PAN to ensure effective loading of MOFs and prevent agglomeration during the NF mixing process. This approach successfully addressed the challenge of exposing active sites within the embedded MOF crystals. Additionally, it overcame the difficulty of recycling traditional MOF adsorbents. As a result, the exceptional performance of MOF NFs offers a promising solution for the efficient removal of cobalt-containing wastewater.

Support Platform of Functionalized Sustainable Cellulose Self-Entanglement Monolithic Adsorbents for Efficient Adsorption of Cadmium(II) Ions

“…Metal–organic frameworks (MOFs) were a new generation of functional inorganic–organic hybrid materials assembled from metal ions/clusters and organic bridging ligands via strong coordination effects. Benefiting from abundant binding sites, simple preparation process, and adjustable structure, MOFs had emerged as promising candidates in various applications such as adsorption and separation, catalysis, energy production, and more. , UiO-66 and its derivatives of UiO-66-(COOH) 2 , UiO-66-NH 2 , and UiO-66-(OH) 2 , as representative zirconium-based MOFs (Zr-MOFs), exhibited attractive chemical stability, good mechanical strength, and relatively low toxicity due to the high combination between inorganic center and organic connectors . In recent years, UiO-66-type MOFs used as adsorbents to adsorb heavy metal ions had gained increasing attention in the fields of water treatment .…”

Facile Prepared MOF-OH-PAN Nanofiber for Separation Co(II) from Waste Batteries

“…Metal-organic frameworks (MOFs) are crystalline materials, the porous structure of which is constructed by the coordination of aromatic carboxylic acids or multi-dentate organic ligands with central metal ions [13][14][15][16][17][18]. MOFs have a wide variety, abundant porosity, steerable pore size, and high surface area, making them ideal for preparing adsorbents [19][20][21][22][23]. Li et al reported on a composite fiber material prepared through the in situ growth of Ce-based MOF on electrospun NFs using a solvothermal method.…”