Zero-emission NO2 capture using divalent metal cation-exchanged zeolites for air purification

Zeyu Tao, Yuanmeng Tian, Ruoxin Wang, Tianyi Zhang, Tianqi Wang, Handan Zhang, Muyao Li, Jiangxiao Qiao, Ming Kong, Shasha Feng, Zhi Ning, Huanting Wang (), Qinfen Gu () and Jin Shang ()
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Zeyu Tao: Shenzhen Hi-Tech Industrial Park
Yuanmeng Tian: Shenzhen Hi-Tech Industrial Park
Ruoxin Wang: Monash University
Tianyi Zhang: Shenzhen Hi-Tech Industrial Park
Tianqi Wang: Shenzhen Hi-Tech Industrial Park
Handan Zhang: Chongqing University
Muyao Li: Nanjing Tech University
Jiangxiao Qiao: Nanjing Tech University
Ming Kong: Chongqing University
Shasha Feng: Nanjing Tech University
Zhi Ning: The Hong Kong University of Science and Technology
Huanting Wang: Monash University
Qinfen Gu: ANSTO
Jin Shang: Shenzhen Hi-Tech Industrial Park

Nature Communications, 2025, vol. 16, issue 1, 1-13

Abstract: Abstract The global adoption of hydrogen and biofuels, though central to decarbonization, risks aggravating NO2 pollution as their combustion drives up NOx emissions through hotter flames and excess oxygen. Effective ambient NO2 removal is critical for protecting human health, yet existing adsorbents often release toxic NO, limiting practical deployment. Here, we overcome this grand challenge by developing divalent metal cation-exchanged zeolites that achieve complete NO2 capture with “zero” NO emission. Exemplified by Ca2⁺- and Mn2⁺-exchanged zeolites, these materials operate under both dry and humid (70% RH) conditions, even at NO2 concentrations up to 500 ppm. Mechanistic studies reveal that divalent cations, acting as surface active sites, can suppress NO formation via stabilizing its intermediate. We further demonstrate real-world applicability by integrating these zeolites into a wearable air-purifying respirator, enabling a “zero-NOx shield” for personal protection. This work establishes NO2 adsorption chemistry and offers a scalable pathway to clean air solutions.

Date: 2025
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DOI: 10.1038/s41467-025-65052-z

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