Optimized Methyl Orange Adsorption on Electrospun Poly(ε-caprolactone)/Polyethyleneimine Nanofibers: Kinetics, Isotherms, and Thermodynamic Insights 


Vol. 27,  No. 2, pp. 667-683, Feb.  2026
10.1007/s12221-025-01261-z


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  Abstract

This study explores the removal of methyl orange (MO) dye from aqueous solutions using electrospun poly(ε-caprolactone)/polyethyleneimine (PCL/PEI) nanofibers, highlighting their potential as a reusable and efficient adsorbent. Process optimization was performed using Box–Behnken design (BBD), chosen for its efficiency in evaluating interactions among key parameters—pH, contact time, initial dye concentration, and adsorbent dosage-with minimal experimental runs. The statistical model identified pH and adsorbent dosage as the most influential factors. At optimal conditions (pH 3.8, 230 min, 35 ppm MO, 0.58 g/L adsorbent), the nanofibers achieved 98% removal efficiency. Adsorption behavior fit the Langmuir isotherm and pseudo-second-order kinetic model, with a maximum adsorption capacity of 357.14 mg/g, surpassing many comparable adsorbents. Thermodynamic analysis confirmed the process as spontaneous and exothermic. Furthermore, the nanofibers retained over 90% efficiency after four regeneration cycles, indicating promising reusability. These findings demonstrate the practical potential of PCL/PEI nanofibers for dye-contaminated wastewater treatment and offer mechanistic insights for further material development.

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  Cite this article

[IEEE Style]

F. Amini, H. Delavari, S. Ghovvati, R. Poursalehi, "Optimized Methyl Orange Adsorption on Electrospun Poly(ε-caprolactone)/Polyethyleneimine Nanofibers: Kinetics, Isotherms, and Thermodynamic Insights," Fibers and Polymers, vol. 27, no. 2, pp. 667-683, 2026. DOI: 10.1007/s12221-025-01261-z.

[ACM Style]

Fereshteh Amini, Hamid Delavari, Shahrokh Ghovvati, and Reza Poursalehi. 2026. Optimized Methyl Orange Adsorption on Electrospun Poly(ε-caprolactone)/Polyethyleneimine Nanofibers: Kinetics, Isotherms, and Thermodynamic Insights. Fibers and Polymers, 27, 2, (2026), 667-683. DOI: 10.1007/s12221-025-01261-z.

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