A Novel Hazelnut Shell/Magnetite Bio-Nano adsorbents for Enhanced Oil Removal From Oil-Contaminated Waters
- Baku State University, Department Ecological Chemistry, AZ1148, Z.Khalilov 23, Baku, Azerbaijan
- Baku State University, Department Chemical Physics of Nanomaterials, AZ1148, Z. Khalilov 23, Baku, Azerbaijan
- Baku State University, Nano Research Center, AZ1148, Z. Khalilov 23, Baku, Azerbaijan
- Sapienza Universita` di Roma, Dipartimento di Ingegneria Chimica Materiali Ambiente, Via Eudossiana 18, 00184 Rome, Italy
Received: 2025-03-26
Revised: 2025-07-15
Accepted: 2025-07-18
Published in Issue 2026-01-02
Published Online: 2025-07-30
Copyright (c) -1 Ulkar Nuru Naghiyeva, Sevinc Rafik Hajiyeva, Flora Vidadi Hajiyeva, Luca di Palma, Irene Bavasso, Maria Paola Bracciale (Author)

This work is licensed under a Creative Commons Attribution 4.0 International License.
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Abstract
The primary objective of this study is to evaluate the feasibility of using hazelnut shells as a biosorbent for the cleanup of oil and petroleum product spills in water bodies. The effects bioadsorbent, nanoparticle concentrations, oil concentration, temperature (10-4000C), and pH on oil adsorption were investigated to determine the optimal conditions for maximum purification efficiency. The highest oil removal efficiency achieved with the biosorbent was 61.25% at a pH of 7.5. To enhance the sorption capacity of the biosorbents were synthesized by incorporating Fe₃O₄ superparamagnetic nanoparticles at concentrations of 1%, 3%, 5%, and 10%. Characterization of both the biosorbents was conducted using SEM, TGA, and FTIR analyses to assess the interaction between Fe₃O₄ nanoparticles and the plant-derived surface of the biosorbent. For an adsorbent such as hazelnut shell+Fe₃O₄ bio-nanoadsorbent, the pHzpc indicates the point at which the surface of the bio-nanoadsorbent changes from negatively charged to positively charged as the pH of the solution increases or decreases. The zero-charge pH point of the bio-nanoasorbent was determined to be pH=8 by Boehm titration. The optimal adsorption conditions for the bio-nanosorbent, composed of hazelnut shell and 10% Fe₃O₄ nanoparticles, were found to be 92.5% oil removal within 12 minutes at a pH of 7.5.
Keywords
- Adsorption,
- Bio-nanoadsorbent,
- Biosorbent,
- Hazelnut shell,
- Oil and oil products,
- Superparamagnetic nanoparticles
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