Scalable Solution Blow‐Spun, Glutaraldehyde‐Crosslinked PVA Nanofibers for Methylene Blue Adsorption

ABSTRACT In this work, a simple and scalable strategy is developed to fabricate robust poly(vinyl alcohol) (PVA) nanofiber mats via solution blow spinning (SBS), followed by chemical crosslinking using glutaraldehyde (GA). Blending high‐ and low‐molecular‐weight PVA at a mass ratio of 7:3 (total polymer concentration of 20 wt%) effectively tailors solution rheology and spinnability, enabling the formation of uniform nanofibers under high‐throughput SBS conditions. Subsequent thermal treatment promotes acetal linkage formation between PVA chains, resulting in markedly enhanced thermal and structural stability, as confirmed by Fourier‐transform infrared spectroscopy and thermogravimetric analysis. Batch adsorption experiments using methylene blue (MB) as a model dye reveal limited adsorption capacity under the investigated conditions, with the adsorption process not reaching equilibrium within the tested time window. Kinetic analysis indicates that the uptake behavior is governed primarily by surface site availability and weak physical interactions, consistent with hydrogen‐bond‐mediated binding between MB molecules and the PVA nanofiber surface. These results highlight that while GA‐crosslinked PVA nanofibers provide a structurally stable and scalable platform, further surface functionalization will be required to strengthen interfacial interactions and enhance adsorption performance in future studies.