Cascade Reaction for Efficient <sup>1</sup> O <sub>2</sub> Generation Enabled by Spatially Coupled Vacancy Pairs
Abstract
ABSTRACT Singlet oxygen ( 1 O 2 ) is a powerful nonradical oxidant for water purification, particularly in complex matrices. However, its spin‐forbidden generation from triplet oxygen ( 3 O 2 ) imposes significant thermodynamic barriers. This study reports a pulsed‐laser synthesis strategy to create atomically adjacent vacancy pairs (V Ti–O ) on the surface of TiO 2 , which function as a cooperative bifunctional redox nanoreactor for the sustainable generation of 1 O 2 . The oxygen vacancy (V O ) serves as a reduction site for O 2 adsorption and activation, whereas the adjacent titanium vacancy (V Ti ), acting as an oxidation site, immediately converts superoxide (O 2 ·− ) into 1 O 2 . The V Ti–O pair shortens the migration path of O 2 ·− , inhibits quenching, and enhances the overall reaction kinetics. In an integrated fixed‐bed reactor operated under natural sunlight in a real water environment, this catalyst enables efficient pollutant degradation while maintaining aquatic biocompatibility, demonstrating its practical potential for low‐energy, efficient 1 O 2 generation and wastewater treatment in sustainable solar‐driven advanced oxidation processes.
Article Details
Authors (8)
Shilan Zhang
State Key Laboratory of Photocatalysis on Energy and Environment College of Chemistry Fuzhou University Fuzhou Fujian P. R. China
Ruopeng Hu
Key Laboratory of Yellow River and Huai River Water Environment and Pollution Control Key Laboratory of Green Chemical Media and Reactions College of Environment Henan Normal University Xinxiang Henan P. R. China
Wandong Xing
State Key Laboratory of Chemistry for NBC Hazards Protection, College of Chemistry
Sikang Xue
State Key Laboratory of Chemistry for NBC Hazards Protection, College of Chemistry
Jiajun Xie
Department of Oncology, Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University School of Medicine
Ruifang Yan
State Key Laboratory of Photocatalysis on Energy and Environment College of Chemistry Fuzhou University Fuzhou Fujian P. R. China
Dapeng Wu
Key Laboratory of Yellow River and Huai River Water Environment and Pollution Control Key Laboratory of Green Chemical Media and Reactions College of Environment Henan Normal University Xinxiang Henan P. R. China
Can Yang