Intrinsic Engineered Stark and Plasmonic synergistic fields at Quercetin Alumina doped TiO2 interfaces for Ultrafast Photocatalytic Oil Degradation in Soil

Photocatalytic remediation of oil-contaminated soils using TiO₂ is fundamentally limited not by light absorption, but by inefficient charge separation. Strongly bound Frenkel excitons in bio-sensitized systems recombine rapidly under heterogeneous soil conditions, rendering them inaccessible to surface redox chemistry when static fields or plasmonic excitation act in isolation. Here, we develop a non-separable DC–AC Stark–plasmonic quantum framework that overcomes this bottleneck by demonstrating that cooperative coupling between intrinsic static interfacial fields and time-dependent plasmonic near-fields is essential for sustained photocatalytic activity in soil environments. The exciton dynamics in a Quercetin@Al:TiO₂ hybrid are modeled quantum mechanically using an asymmetric interfacial potential under periodic Stark modulation, with dissociation formulated as field-assisted tunneling into oxide continuum states within a Floquet–Sambe representation. Our analysis reveals that DC–AC coupling actively suppresses recombination, dynamically lowers exciton binding barriers, and sustains non-equilibrium populations of long-lived charge carriers precisely at oil–TiO₂ interfaces. This field-driven mechanism enhances the localized generation of reactive oxygen species and induces a decisive transition from recombination-limited to reaction-limited photocatalysis, even under the adsorption and transport constraints of soil matrices. The results culminate in a universal scaling law linking defect density and plasmonic amplitude to photocatalytic efficiency. This work provides the first theoretical framework for field-engineered exciton dissociation in a bio-hybrid photocatalyst, establishing a transformative design paradigm for high-efficiency, self-driven solar remediation technologies.