Pilot‐Scale Photoreforming of Hydrolyzed Polylactic Acid Waste to High‐Value Chemicals and H 2 via Atomic Ru Integration

Abstract Photoreforming of polylactic acid (PLA) waste into valuable chemicals offers a promising approach for environmental protection and waste valorization, yet faces challenges of low yields and harsh conditions. Herein, a Cd 0.5 Zn 0.5 S nanotwin catalyst decorated with Ru single atoms and clusters is reported, enabling selective photoreforming of PLA into pyruvic acid (PA) and H 2 . It is demonstrated that Ru single atoms favor PA formation via hydroxyl dissociation, while the further incorporation of Ru clusters serve as active sites for H 2 production. This synergistic effect significantly enhances photocatalytic performance, achieving 96.8% PA selectivity and efficient H 2 production with a record‐breaking apparent quantum efficiency of 83.7% at 400 nm. This approach is scalable for outdoor processes, utilizing direct 1 m 2 sunlight irradiation to deliver ≈1191 mL h −1 of H 2 and 47.27 mmol h −1 of PA from PLA waste, paving a viable pathway for large‐scale simultaneous production of high‐value chemicals and H 2 .