Photonic field enhancement and UV shifting via Allium cepa-derived quercetin coupled to Al-doped TiO2 for ultrafast photocatalytic oil degradation in contaminated
- Photonics and Solid-State Physics Unit, Department of Physics, Ignatius Ajuru University of Education, Rumuolumeni, Rivers State Nigeria
- Department of Animal and Enviromental Biology, University of Uyo, Akwa Ibom State, Nigeria
- Solid State Physics Unit, Department of Physics, Ignatius Ajuru University of Education, Rumuolumeni, Rivers State Nigeria
- Department of Physics, Federal College of Education(T), Omoku, Rivers State, Nigeria
- Department of Agronomy, William V.S Tubman University, Harper Liberia.
Received: 2025-06-05
Revised: 2025-08-09
Accepted: 2025-08-14
Published in Issue 2025-08-31
Copyright (c) 2025 Moses Udoisoh, Ubong Bernard Essien, Chukwuwendu Jeffrey Amaechi, Dibia Victor Okwudiri, Oluwatosin Mayowa Olajide (Author)

This work is licensed under a Creative Commons Attribution 4.0 International License.
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Abstract
Photocatalytic remediation of petroleum hydrocarbon-contaminated soils remains challenging due to TiO₂’s limited solar spectral response and poor light penetration in turbid media. In this study, we present a novel and rationally designed quercetin-Al-TiO₂@SiO₂ aerogel composite that overcomes these limitations through synergistic photonic, plasmonic, and scattering-mitigation strategies. Allium cepa-derived quercetin acts as a bio-photonic converter, absorbing underutilized UV-A (320-400 nm) and re-emitting UV-B (280-320 nm) via Stokes shift, precisely matching the LSPR-enhanced absorption of Al-doped TiO₂. The mesoporous SiO₂ aerogel simultaneously minimizes scattering losses (
) while enhancing photon residence time (
). Our first-principles modeling predicts a significantly improved photocatalytic efficiency, demonstrating a 24-fold enhancement in degradation kinetics (t₁/₂ ∼ 60 min) compared to conventional TiO₂, achieved through optimized ROS generation (10⁵ cm⁻³s⁻¹) and charge separation (
). The proposed system also anticipates long-term field deployment, with a photostability-informed quercetin encapsulation strategy, dopant-retention in Al–TiO₂, and aerogel durability supporting reusability. This work demonstrates a new paradigm for solar-driven environmental remediation by integrating biological spectral conversion with engineered plasmonic nanomaterials in a soil-compatible matrix, offering a sustainable solution for large-scale hydrocarbon degradation.
Keywords
- Quercetin phtotocatalysis,
- Al-doped TiO2,
- Stokes shift,
- Oil degradation in contaminated soils,
- BioPhotonics
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