Metal-organic frameworks with photocatalytic bactericidal activity for integrated air cleaning

Ping Li, Jiazhen Li, Xiao Feng, Jie Li, Yuchen Hao, Jinwei Zhang, Hang Wang, Anxiang Yin, Junwen Zhou, Xiaojie Ma () and Bo Wang ()
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Ping Li: Beijing Institute of Technology
Jiazhen Li: Beijing Institute of Technology
Xiao Feng: Beijing Institute of Technology
Jie Li: Beijing Institute of Technology
Yuchen Hao: Beijing Institute of Technology
Jinwei Zhang: Beijing Institute of Technology
Hang Wang: Beijing Institute of Technology
Anxiang Yin: Beijing Institute of Technology
Junwen Zhou: Beijing Institute of Technology
Xiaojie Ma: Beijing Institute of Technology
Bo Wang: Beijing Institute of Technology

Nature Communications, 2019, vol. 10, issue 1, 1-10

Abstract: Abstract Air filtration has become an essential need for passive pollution control. However, most of the commercial air purifiers rely on dense fibrous filters, which have good particulate matter (PM) removal capability but poor biocidal effect. Here we present the photocatalytic bactericidal properties of a series of metal-organic frameworks (MOFs) and their potentials in air pollution control and personal protection. Specifically, a zinc-imidazolate MOF (ZIF-8) exhibits almost complete inactivation of Escherichia coli (E. coli) (>99.9999% inactivation efficiency) in saline within 2 h of simulated solar irradiation. Mechanistic studies indicate that photoelectrons trapped at Zn+ centers within ZIF-8 via ligand to metal charge transfer (LMCT) are responsible for oxygen-reduction related reactive oxygen species (ROS) production, which is the dominant disinfection mechanism. Air filters fabricated from ZIF-8 show remarkable performance for integrated pollution control, with >99.99% photocatalytic killing efficiency against airborne bacteria in 30 min and 97% PM removal. This work may shed light on designing new porous solids with photocatalytic antibiotic capability for public health protection.

Date: 2019
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DOI: 10.1038/s41467-019-10218-9

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