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Jin Shang Group's paper published on a top General Chemistry journal – Angewandte Chemie International Edition

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Nitrogen dioxide (NO2) pollution causes serious environmental problems and poses substantial health threats to human beings. NO2 leads to the formation of photochemical smog, acid rain, as well as some human diseases. Various NO2 emission sources, such as exhaust from vehicles and flue gas from the burning of fossil fuels, contribute to the accumulation of NO2 in the atmosphere. Although the state of the art selective catalytic reduction technology applicable to NO2 conversion at high temperatures (250-600 oC) has been widely used in industry, the control and abatement of ambient NO2 emission is still an elusive challenge. Dr. Jin Shang Group in School of Energy and Environment in collaboration with researchers from the Australian Synchrotron, Jilin University, and Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences develops an efficient technology for ambient NO2 removal based on selective adsorption on porous materials and the results were published on a top General Chemistry journal – Angewandte Chemie International Edition (https://doi.org/10.1002/anie.202007054).

 

In this study we attempt to address this challenge by developing π-backbonding adsorbents in the transition metal incorporated porphyrin metal-organic frameworks (PMOFs). The idea is originated from nature – the ferroporphyrin in a natural molecule-hemoglobin shows strong affinity toward π molecules, such as oxygen and carbon monoxide, via a unique interaction called π-backbonding. The π-backbonding can be formed and tuned between transition metals and π molecules to realize selective binding, which can be used to enable selective gas adsorption. In other words, it allows for gas purification by selectively removing a certain gas component from a mixture gases stream, such as removing NO2 from air. Since NO2 is a π molecule, we designed PMOFs featuring a large density of transition metal sites to selectively bind NO2 and thus remove it from air, achieving appreciable NO2 capacity and good regenerability. Our work affords new insights for designing next-generation adsorbents for ambient NO2 removal and presents PMOFs as a platform to tailor π-backbonding adsorbents for various gas separation applications pertaining to energy production and environmental remediation.

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