廃棄物糖蜜由来のホウ素・窒素共ドープバイオ炭による過硫酸塩の効率的な活性化によるオキシテトラサイクリン分解：性能研究、分解経路、およびメカニズム

A high-performance B/N codoped biochar (NB₃GC) was synthesized using byproduct molasses via a combined hydrothermal treatment and pyrolysis process. A systematic investigation was carried out on the efficiency and underlying mechanism of NB₃GC-activated peroxydisulfate (PDS) in degrading oxytetracycline hydrochloride (OTC). The results suggest that B/N codoping improved the pore structure and catalytic activity of the biochar material. The NB₃GC catalyst exhibited exceptional performance in PDS activation for OTC removal. With NB₃GC (0.4 g/L) and PDS (0.4 mM), the NB₃GC/PDS system achieved a 99.1% OTC removal efficiency within 10 min, with a total organic carbon mineralization rate of 31.5%. The system maintained robust catalytic capability over the pH range (2-10) and in common interfering ions such as Cl^- and HCO₃^-. Mechanistic studies identified O₂^•- as the primary reactive species, with ^•OH and SO₄^•- playing synergistic roles. Density functional theory calculations combined with liquid chromatography-mass spectrometry (LC-MS) analysis revealed that OTC underwent stepwise degradation via decarboxylation, ring-opening, and hydroxylation, ultimately forming low-molecular-weight products. This study offers a useable strategy for the valorization of waste molasses and an efficient nonmetal-based catalytic scheme , for environmental remediation.