Cellulose acetate nanofiber modified with polydopamine polymerized MOFs for efficient removal of noxious organic dyes

Abstract

Abstract As the global discharge of organic dyes into water bodies continues to surge, the imperative of efficiently removing these dyes from aquatic systems has gained paramount significance. This investigation explores the potential of a recently engineered adsorbent material, polydopamine-binary Metal-Organic Frameworks (MOFs) ZIF-8 and UiO-66, referred to as ZIF-8/UiO-66/PDA, for the elimination of methylene blue (MB) dye. These MOFs were incorporated into cellulose acetate (CA), producing ZIF-8/UiO-66/PDA@CA nanofibers under meticulously optimized conditions. The ZIF-8/UiO-66/PDA@CA nanofibers were characterized utilizing various tools including FTIR, XRD, SEM, zeta potential, BET, tensile strength testing, and XPS. Results revealed a substantial leap in tensile strength, with ZIF-8/UiO-66/PDA@CA registering an impressive 2.8 MPa, as a marked improvement over the neat CA nanofibers (1.1 MPa). ZIF-8/UiO-66/PDA@CA nanofibers exhibit an outstanding adsorption capacity of 82 mg/g, notably outperforming the 22.4 mg/g capacity of neat CA nanofibers. In binary dye systems, these nanofibers exhibit a striking maximum adsorption capacity of 108 mg/g, establishing their eminence in addressing the complexities of wastewater treatment. Adsorption data fitted to the Langmuir isotherm, and the pseudo-second-order kinetic model. The fabricated nanofiber demonstrates good reproducibility and durability, consistently upholding its performance over five cycles. This suite of remarkable attributes collectively underscores its potential as a robust, durable, and highly promising solution for the effective and efficient removal of pernicious MB dye, in the context of both water quality improvement and environmental preservation.