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Heterogeneous Conversion of SO2 on Nano α-Fe2O3: the Effect of Morphology, Light Illumination and Relative Humidity

Abstract

Hematite is one of the important components in atmospheric mineral aerosols, which always presents different morphologies due to different formation processes and various sources. However, little attention has been paid to the influences of particles’ morphologies on atmospheric heterogeneous reactions, as well as the contributions from illumination and moisture. In the present study, the impacts of these factors on the heterogeneous conversion of SO2 on nano α-Fe2O3 particles with different morphologies were investigated in detail by using in situ diffuse-reflectance infrared Fourier-transform spectroscopy (DRIFTS). Results indicated that the heterogeneous reactivities were significantly different among four α-Fe2O3 samples with various shapes. Compared to the nanocapsule-like and hollow nanoring-like α-Fe2O3, the hexagonal nanoplate-like and agglomerated nanoparticle-like α-Fe2O3 exhibited significantly greater uptake capacity of SO2, probably attributing to the abundant reactive sites, larger BET surface area and pore size. In addition, light illumination enhanced the heterogeneous conversion of SO2 on the four nano α-Fe2O3 samples, which might be due to the semiconducting property of hematite and comparatively low light intensity. Furthermore, moisture promoted the heterogeneous uptake of SO2 on hexagonal nanoplate-like α-Fe2O3 in appropriate range, while exceeded moisture was unfavorable for the sulfate formation. Possible mechanisms in the present study were also proposed. This study would be helpful in understanding the atmospheric heterogeneous processes and provide useful parameters for atmospheric modelling studies.

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Publication details

The article was received on 23 Jan 2019, accepted on 11 Apr 2019 and first published on 11 Apr 2019


Article type: Paper
DOI: 10.1039/C9EN00097F
Citation: Environ. Sci.: Nano, 2019, Accepted Manuscript

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    Heterogeneous Conversion of SO2 on Nano α-Fe2O3: the Effect of Morphology, Light Illumination and Relative Humidity

    K. Li, L. Kong, A. Zhanzakova, S. Tong, J. Shen, T. Wang, L. Chen, Q. Li, H. Fu and L. Zhang, Environ. Sci.: Nano, 2019, Accepted Manuscript , DOI: 10.1039/C9EN00097F

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