Akademik Veri Yönetim Sistemi
Surfaces and Interfaces, cilt.80, 2026 (SCI-Expanded, Scopus)
Rational interface and defect engineering have emerged as powerful strategies to address the intrinsic limitations of photocatalysts in energy and environmental applications. In this study, oxygen-vacancy-rich BiOX ( X = Cl, Br) nanoflakes were synthesized and coupled with g -C3N4 through a facile ethylene glycol-assisted solvothermal method to construct a ternary BiOvCl/BiOvBr@ g -C3N4 heterojunction. Oxygen vacancies significantly modified the electronic structure, narrowed the bandgap, and extended visible-light absorption, improving charge carrier separation and utilization. A dual S-scheme charge transfer pathway was established within the ternary heterojunction, effectively preserving strong redox potentials while minimizing electron-hole recombination. The optimized BiOvCl/BiOvBr@ g -C3N4 heterojunction achieved remarkable photocatalytic degradation of carbamazepine (96.27 % removal within 90 min under simulated solar light), outperforming binary and pristine components. Density functional theory (DFT) calculations revealed that oxygen vacancies introduced mid-gap states and facilitated directional charge migration across interfaces, while liquid chromatography-mass spectrometry (LC-MS) identified reactive intermediates and clarified the degradation pathway. The synergy between vacancy-induced band modulation and dual S-scheme heterojunction engineering underscores the pivotal role of defect-interface coupling in enhancing photocatalytic efficiency. This study provides new insights into the rational design of oxygen-defective, multicomponent photocatalysts and establishes a versatile platform for developing next-generation materials for antibiotic degradation and broader solar-driven environmental remediation.