Tailored biopolymer films based on cellulose acetate and cobalt ferrite nanoparticles: Dye adsorption and antimicrobial activity

Abstract

In this work, easy-collect adsorbent strips were developed based on the inclusion of cellulose acetate and poly(ԑ-caprolactone) (CA/PCL) as a template for cobalt ferrite nanoparticles (CoFe₂O₄NPs) with different concentrations (1, 3, and 5 %). The formulated strips and their parent components were characterized using FTIR and XRD. In addition, topographical analysis, including TEM for CoFe₂O₄NPs and SEM and EDX, was performed for formulated strips. The kinetics and the isotherm models were applied to explain the adsorption mechanism. The antimicrobial activity of the formulated strips was studied against the popular water-contaminated microorganism strains. The antimicrobial activity of the strips was presented as a broad spectrum antibacterial activity, and antifungal activity against unicellular and filaments was increased in parallel with CoFe₂O₄NPs concentration. The kinetics and isotherm models emphasized that the cationic dye was fitted with a pseudo-first-order and that the anionic dye was fitted with a pseudo-second-order. Moreover, the Langmuir and Freundlich isotherm models were fitted to cationic and anionic dyes. CA/PCL@CoFe₂O₄NPs (5 %) stripe recorded q_m as 1567 and 908 mg g^-1 for methylene blue (MB) and methyl orange (MO), respectively. These findings recommended these stripes for multi-dye adsorption.