MIL-88A(Fe) Adsorption-Photocatalytic Synergistic Degradation of Phenanthrene-Pyrene Composite Pollutants in Soil

• • MIL-88A(Fe) achieved a maximum adsorption capacity of 97.25 mg/kg for PHE-PYR, with adsorption dominated by physical monolayer surface processes, enhancing local pollutant concentration and subsequent photocatalytic efficiency. • • Under optimal conditions (3% catalyst dosage, 40% soil moisture, 60 min visible light, 200 mg/kg initial pollutant, acidic soil), the synergistic adsorption-photocatalytic degradation reached 79.20%, demonstrating practical viability for soil remediation. • • The catalyst exhibited a narrow bandgap of 3.04 eV and strong visible-light response (200–600 nm), enabling effective photogenerated electron-hole separation, critical for photocatalytic activity. • • Quenching experiments confirmed superoxide radicals (·O2−) and holes (h+) as dominant reactive species; GC-MS identified PYR conversion to PHE via hydroxylation/oxidation as a key degradation pathway, leading to complete mineralization.