ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Synergistic corrosion protection of aluminum in NaOH solution by CBP–GO composite derived from banana peel waste: experimental, adsorption, and SEM/EDX analysis

Ghalia A. Gaber, Amira M. Hyba, Aml M. Saleh, and Heba M. El Refay

Department of Chemistry, Faculty of Science (Girls), Al-Azhar University, Nasr City, Egypt

E-mail: ghaliaasaid@azhar.edu.eg

Received: 20 November 2025  Accepted: 27 February 2026

Abstract:

In this study, cellulose was efficiently extracted from banana peels and combined with graphene oxide (GO) to prepare an eco-friendly CBP–GO composite. The materials were characterized using SEM, EDX, and FTIR analyses, confirming hydrogen bonding interactions and surface integration between cellulose and GO. The corrosion inhibition performance of CBP and CBP–GO on aluminum in 0.1 N NaOH was evaluated using weight loss measurements. The inhibition efficiency increased with inhibitor concentration, reaching 88.89% for CBP and 92.59% for CBP–GO at 200 ppm. The presence of GO enhanced adsorption and barrier layer formation, resulting in improved corrosion protection. Adsorption followed the Langmuir isotherm, indicating monolayer coverage on a homogeneous surface. Kinetic and thermodynamic analyses demonstrated that the adsorption process is endothermic and spontaneous. SEM/EDX observations confirmed effective surface protection, showing reduced corrosion products and surface roughness in the presence of CBP–GO. These findings highlight the potential of CBP–GO as a sustainable and efficient green corrosion inhibitor for aluminum in alkaline environments.

Graphical abstract

Keywords: Banana peel; Graphene oxide; CBP–GO composite; Aluminum corrosion; Green inhibitor; Adsorption isotherm

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-026-04773-x

Chemical Papers 80 (6) 6401–6417 (2026)