Visualization of gaseous iodine adsorption on single zeolitic imidazolate framework-90 particles

Yuting Lei, Guihua Zhang, Qinglan Zhang, Ling Yu, Hua Li, Haili Yu () and Yi He ()
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Yuting Lei: Southwest University of Science and Technology
Guihua Zhang: Southwest University of Science and Technology
Qinglan Zhang: Southwest University of Science and Technology
Ling Yu: Southwest University of Science and Technology
Hua Li: Southern University of Science and Technology
Haili Yu: Southwest University of Science and Technology
Yi He: Southwest University of Science and Technology

Nature Communications, 2021, vol. 12, issue 1, 1-8

Abstract: Abstract Zeolitic imidazolate frameworks (ZIFs) are very useful as high-capacity iodine (I2) adsorbents. The adsorption performance is usually probed by measuring a statistical average property over an entire sample consisting of a large number of ZIF particles, leaving the interparticle heterogeneity information among individuals. Here we report a dark-field microscopy (DFM) method to visualize gaseous I2 adsorption on single ZIF-90 particles in situ and in real time. The adsorption of I2 is found to alter the scattering spectrum of ZIF-90 particles, inducing a distinct color change from bluewhite to yellow. According to correlating the adsorption amount of gaseous I2 with the change of B value from DFM images, we quantitatively image the adsorption process and estimate the related kinetic parameters at the single particle level. Single particle measurements clarify the large particle-to-particle heterogeneity in adsorption reactivity and significant adsorption activity improvement of ZIF-90 after introduction of linker defects, which provides a microscopic understanding of the structure-activity relationship. We further demonstrate the capacity of this strategy for studying gaseous I2 adsorption on single ZIF-91 particle as a derivative of ZIF-90 to illustrate the generality.

Date: 2021
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DOI: 10.1038/s41467-021-24830-1

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