Scalable Synthesis of PtAu Nanoalloy-Decorated Hydrogenated TiO<sub>2</sub> for High-Efficiency Indoor Formaldehyde Photodegradation

Scalable Synthesis of PtAu Nanoalloy-Decorated Hydrogenated TiO<sub>2</sub> for High-Efficiency Indoor Formaldehyde Photodegradation

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<sub>2</sub...

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Bibliographic Details
Main Authors: Hairui Cai, Benjamin Yang, Jie Hou, Ziqi Wang, Zhuo Li
Format: Article
Language:English
Published: MDPI AG 2025-04-01
Series:Nanomaterials
Subjects:
formaldehyde
hydrogenated P25
photocatalyst
PtAu nanoalloys
Online Access:https://www.mdpi.com/2079-4991/15/9/683
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Summary: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<sub>2</sub> (P25) loaded with PtAu nanoalloys (P25(H)-PtAu), using a combination of ball milling and high-temperature annealing. Hydrogenation-induced defect-rich TiO<sub>2</sub> 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.
ISSN:2079-4991

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