Facile green fabrication of MIL‐101(Cr)/PVA nanofiber composite as effective, stable, and reusable adsorbent for cationic dye removal

• Published in: Polymer engineering and science Vol. 64; no. 11; pp. 5375 - 5391
• Main Authors: Thamer, Badr M., Al‐aizari, Faiz A., Abdo, Hany S., El‐Newehy, Mohamed H.
• Format: Journal Article
• Language: English
• Published: Hoboken, USA John Wiley & Sons, Inc 01.11.2024; Society of Plastics Engineers, Inc; Blackwell Publishing Ltd
• Subjects: Adsorbents; Adsorption; Analysis; Cationic dyes; Chromium; crystal violet; Dispersants; electrospinning; Factorial design; Fibrous structure; Force and energy; Heat treatment; Metal-organic frameworks; Methylene blue; MOFs; Nanocomposites; Nanofibers; Polyvinyl alcohol; Purification; PVA NFs; reusability; Sewage; Stability; Wastewater treatment; Saudi Arabia
• ISSN: 0032-3888; 1548-2634
• DOI: 10.1002/pen.26922

In this study, chromium‐based metal–organic framework (MIL‐101(Cr)) was incorporated into polyvinyl alcohol nanofibers (PVA NFs) via green electrospinning followed by heat treatment to fabricate MIL‐101(Cr)@PVA NFs composite without the need for any organic solvent or other dispersants. The fabricated MIL‐101(Cr)@PVA NFs were comprehensively characterized using a suite of common techniques. Morphological characteristics of MIL‐101(Cr)@PVA NFs showed a fibrous structure with an average diameter of 228 ± 37 nm and decorated with MIL‐101(Cr) particles arranged in a nanoneedle‐like pattern. Subsequently, its adsorption efficiency towards the cationic crystal violet dye (CV) was evaluated through batch adsorption experiments. The influence of various experimental parameters on CV removal efficiency was systematically optimized using a factorial design approach. The Langmuir isotherm and kinetic pseudo‐second‐order (PSO) model provided an excellent fit to the adsorption equilibrium data, indicating a maximum adsorption capacity (qmax) of 344.18 mg/g for MIL‐101(Cr)@PVA NFs compared with 83.94 mg/g for pristine PVA NFs. Furthermore, the MIL‐101(Cr)@PVA NFs composite demonstrated excellent reusability and stability, maintaining a significant portion of its removal capacity even after six adsorption–desorption cycles. These findings highlight the potential of the fabricated composite as a highly efficient and reusable adsorbent for CV removal from wastewater treatment applications. Highlights The MIL‐101(Cr)@PVA NFs nanocomposite fabricated by electrospinning technique. The MIL‐101(Cr) particle arranged in a nanoneedle‐like pattern in the PVA NFs. Incorporation of MIL‐101(Cr) improved qmax of PVA by 391.5%. The MIL‐101(Cr)@PVA NFs membrane has excellent stability and reusability. Fabrication of high‐performance MIL‐101(Cr)@PVA nanofibers as effective and reusable adsorbent for cationic dye removal.