Efficient and stable photocatalytic degradation of triazophos pesticides by g-C3N4/WO2.72 nanocomposite with S-scheme heterojunction and oxygen vacancies

Abstract

Facing the increasingly severe issue of organophosphorus pesticide contamination globally, this study has developed a novel g-C3N4/WO2.72 nanocomposite (abbreviated as CN/WO), featuring a specially designed S-scheme heterojunction and oxygen vacancies, to optimize the photocatalytic degradation of triazophos pesticides. Experiments demonstrate that the composite containing 30 % CN (termed 30-CN/WO) can efficiently degrade most of the triazophos within 100 minutes, and it exhibits exceptional stability across four successive cycles, significantly outperforming the individual CN and WO materials. Advanced analytical techniques such as X-ray photoelectron spectroscopy (XPS), electron paramagnetic resonance (EPR), and surface work function assessments have confirmed the pivotal role of the S-scheme heterojunction and oxygen vacancies in enhancing charge separation efficiency. This work not only advances the development of high-performance photocatalytic materials but also provides new strategies and practical scientific evidence for addressing organophosphorus pesticide pollution globally, showcasing its broad application prospects and scientific significance in environmental management.