講演情報
[15p-S4_202-6]Photoreforming of Plastic Waste to Hydrogen Using Single-Atom Anchored Pt Decorated Graphitic Carbon Nitride
〇(BC)Lu PeiHsuan1, Chang JiaMao1, Chang YinHsuan1, Lin TingHan2, Wu MingChung1,2 (1.Department of Chemical and Materials Engineering, Chang Gung Univ., 2.Center for Sustainability and Energy Technologies, Chang Gung Univ.)
キーワード：
g-C3N4、photoreforming、photocatalytic hydrogen production
The global accumulation of plastic waste, particularly microplastics, poses severe environmental and health challenges, contributing to persistent contamination across the hydrological ecosystems. Advancements in catalytic technologies, photoreforming has gained attention as a sustainable approach to convert plastic waste into clean hydrogen fuel using sunlight. Graphitic carbon nitride (g-C3N4) has attracted attention due to visible-light-responsive photocatalyst, tunable electronic structure and thermal stability. When integrated with single-atom catalysts (SACs), g-C3N4 offers the potential to construct atomically dispersed active sites. However, its photocatalytic performance is constrained by the lack of well-defined coordination environments, impeding performance optimization. The inherently disordered polymeric framework of g-C3N4 complicates the precise anchoring of SACs, thus limiting interfacial charge transfer and catalyst stability. In this study, we unveiled the local coordination structure and interfacial charge transfer mechanisms of platinum single-atom catalysts (Pt-SACs) on g-C3N4. X-ray absorption spectroscopy reveals Pt-N4 coordination anchored at off-plane distorted heptazine units, where distortion-induced charge localization enhances interfacial electron transfer to Pt sites. Under light irradiation, in situ measurements confirm efficient interfacial charge transfer at the Pt-C3N4 interface. Among tested microplastics involving PE, PVC, PMMA, PP, and PS, PET exhibits the highest hydrogen evolution rate of 533.18 μmol·g-1·h-1, attributed to ester bond scission under alkaline conditions. This work provides fundamental insight into the structure–activity relationship of Pt SACs in polymeric semiconductors and establishes a rational design strategy for photoreforming of plastic-to-fuel conversion.