Akademik Veri Yönetim Sistemi
Journal of the Taiwan Institute of Chemical Engineers, cilt.183, 2026 (SCI-Expanded, Scopus)
Background The persistence of pharmaceutical contaminants such as cefixime (CFX) in aquatic systems poses serious environmental and health risks. Developing defect-engineered photocatalysts with efficient charge separation and enhanced visible-light activity is a critical strategy for wastewater remediation. Methods Hierarchical BiO1-xBr/BiOI1-x-CdS multicomponent heterostructure was rationally constructed via hydrothermal synthesis by integrating BiO1-xBr/BiOI1-x microflakes with CdS nanoflowers. The introduction of oxygen and iodine vacancies tailored the electronic configuration and strengthened interfacial coupling. Structural, spectroscopic, and photoelectrochemical analyses were performed to evaluate charge separation and transfer pathways. Photocatalytic activity was tested through CFX degradation under visible light. Reactive species trapping, electron spin resonance, and liquid chromatography-mass spectrometry have employed to identify active species and degradation intermediates. Findings The defect-engineered heterojunction exhibited a dual S-scheme charge transfer pathway that promoted efficient electron-hole separation and accelerated carrier migration due to the phenomenon of internal electric field and band bending, hence improving the CFX photodegradation efficiency. The BiO1-xBr/BiOI1-x-CdS photocatalytic system demonstrated a remarkable photocatalytic degradation efficiency of CFX, reaching approximately 95.8 % within 120 min under visible light at pH 6.0–6.5. In comparison to ternary, the CdS, BiO1-xBr, BiOI1-x, and BiO1-xBr/BiOI1-x reported photocatalytic reductions of only ∼46 %, ∼53 %, ∼62 %, and ∼79.4 % within same time period. Reactive species trapping and electron spin resonance analysis revealed that hydroxyl (.OH) and superoxide (-O2.) radicals were the dominant oxidative agents driving the degradation process. The catalyst maintained high structural integrity and stable photocatalytic activity over five consecutive cycles.