Cai Hairui, Yang Benjamin, Hou Jie, Wang Ziqi, Li Zhuo
MOE Key Laboratory for Non-Equilibrium Synthesis and Modulation of Condensed Matter, Key Laboratory of Shaanxi for Advanced Materials and Mesoscopic Physics, State Key Laboratory for Mechanical Behavior of Materials, School of Physics, Xi'an Jiaotong University, No. 28 West Xianning Road, Xi'an 710049, China.
Shanghai American School Pudong Campus, No. 1600 Lingbai Highway, Shanghai 201201, China.
Nanomaterials (Basel). 2025 Apr 30;15(9):683. doi: 10.3390/nano15090683.
Formaldehyde, a pervasive indoor air pollutant posing significant health risks, has driven extensive research into advanced mitigation strategies to ensure safer living environments. Herein, this study presents a synthesis method for the large-scale production of hydrogenated TiO (P25) loaded with PtAu nanoalloys (P25(H)-PtAu), using a combination of ball milling and high-temperature annealing. Hydrogenation-induced defect-rich TiO efficiently improves visible light absorption, enhancing the utilization of visible light in photocatalytic reactions. Mechanochemical ball milling was employed to prepare ultrasmall PtAu nanoalloys with a size of 3.7 ± 0.1 nm, which were uniformly dispersed on the surface of P25(H). Density functional theory (DFT) results indicate that PtAu nanoalloys synergistically enhance charge separation via Schottky junctions and surface reaction kinetics by optimizing reactant adsorption. As a result, P25(H)-PtAu achieves industrially relevant formaldehyde removal efficiency (97.8%) under ambient light conditions while maintaining scalability (10 g batches). This work provides a scalable framework for developing manufacturable photocatalysts, with immediate applications in heating, ventilation and air conditioning systems, and air purifiers.
甲醛是一种普遍存在的室内空气污染物，对健康构成重大风险，这推动了对先进缓解策略的广泛研究，以确保更安全的生活环境。在此，本研究提出了一种合成方法，通过球磨和高温退火相结合，大规模生产负载PtAu纳米合金的氢化TiO（P25）（P25(H)-PtAu）。氢化诱导的富含缺陷的TiO有效提高了可见光吸收，增强了光催化反应中可见光的利用率。采用机械化学球磨制备了尺寸为3.7±0.1nm的超小PtAu纳米合金，其均匀分散在P25(H)表面。密度泛函理论（DFT）结果表明，PtAu纳米合金通过肖特基结协同增强电荷分离，并通过优化反应物吸附提高表面反应动力学。结果，P25(H)-PtAu在环境光条件下实现了与工业相关的甲醛去除效率（97.8%），同时保持了可扩展性（10g批次）。这项工作为开发可制造的光催化剂提供了一个可扩展的框架，可立即应用于供暖、通风和空调系统以及空气净化器。
