Valorization of Sugarcane Bagasse into Cellulose Nanofibers for Efficient Adsorption of Chromium Hexavalent Ions

Awydat, Hanan; Abdelwahed, Fatma T.; El-Sayed, Naglaa Salem; El Defrawy, Mohamed M.; Eltabey, Rania M.

doi:10.21608/ejchem.2025.390208.11842

Valorization of Sugarcane Bagasse into Cellulose Nanofibers for Efficient Adsorption of Chromium Hexavalent Ions

Document Type : Original Article

Authors

¹ Chemistry Department, Faculty of Science, Mansoura University, Mansoura, Egypt

² Cellulose and Paper Department, National Research Centre, 33 El Bohouth St., Dokki, P.O. 12622, Giza, Egypt

10.21608/ejchem.2025.390208.11842

Abstract

A TEMPO-oxidized cellulose nanofiber (CNF) was synthesized and characterized using FTIR, XRD, and TEM to confirm its structural and functional properties. This modified CNF was then applied as an adsorbent for removing Cr(VI) from aqueous solutions. Key parameters affecting the adsorption process, including pH, sorbent dosage, initial Cr(VI) concentration, contact time, temperature, as well as desorption conditions, were systematically studied. The results revealed that the CNF exhibited an impressive adsorption capacity of 302.0 mg g⁻¹ for Cr(VI) at optimum conditions of pH 2.0, 0.03g (dose), 60 min, and 25 oC. Moreover, kinetic studies indicated that the process fitted well with pseudo-second-order kinetics, while equilibrium data were best described by the Freundlich isotherm, suggesting a heterogeneous, multi-layer adsorption mechanism. Furthermore, the obtained results revealed that 90% of adsorbed Cr(VI) could be regenerated by using 0.1 M NaOH even after three adsorption-desorption cycles.

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