Hybrid TiO₂@SiO₂ Green Hydrogel Nanocatalyst for High-efficiency Photocatalytic Oxidation of Ciprofloxacin under UV Irradiation: Experimentation and RSM Optimization

Mansour, Riad
Ferrah, Nacer
Fithriyah, Nurul Hidayati
Purnawan, Irfan
Chabane, Mustapha
Zahouane, Fadila
Melkaoui, Chikh

Bulletin of Chemical Reaction Engineering & Catalysis
2026: Just Accepted Manuscript and Article In Press 2026

A TiO₂@SiO₂ hydrogel nanocomposite was synthesized via a green sol-gel route for the photocatalytic degradation of ciprofloxacin using a UVA/H2O2 system. The catalyst was optimized via RSM (response surface methodology), identifying UVA irradiation (365 nm) and pH 5.6 as key parameters, achieving >89% degradation within 180. Characterisation confirmed homogeneous TiO₂ dispersion within a porous SiO₂ matrix. Kinetics followed a pseudo-first-order Langmuir–Hinshelwood model, and the catalyst retained high activity over five reuse cycles. This study introduces a UVA-optimized, RSM-guided photocatalytic system using a green-synthesized TiO₂@SiO₂ hydrogel –distinguished by its integrated process design, operational simplicity, and focus on solar-compatible UVA rather than conventional UVC-driven TiO2@SiO2 systems.