Formation mechanism and porosity development in porous boron nitride
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Porous boron nitride (BN) has proven promising as a novel class of inorganic materials in the field of separations and particularly adsorption. Owing to its high surface area and thermal stability, porous BN has been researched for CO2 capture and water cleaning, for instance. However, research remains at the laboratory scale due to a lack of understanding of the formation mechanism of porous BN, which is largely a “black box” and prevents scale up. Partial reaction pathways have been unveiled, but they omit critical steps in the formation, including the porosity development, which is key to adsorption. To unlock the potential of porous BN at a larger scale, we have investigated its formation from the perspective of both chemical formation and porosity development. We have characterized reaction intermediates obtained at different temperatures with a range of analytical and spectroscopic tools. Using these analyses, we propose a mechanism highlighting the key stages of BN formation, including intermediates and gaseous species formed in the process. We identified the crucial formation of nonporous carbon nitride to form porous BN with release of porogens, such as CO2. This work paves the way for the use of porous BN at an industrial level for gas and liquid separations.
L'Hermitte , A , Dawson , D M , Ferrer , P , Roy , K , Held , G , Tian , T , Ashbrook , S E & Petit , C 2021 , ' Formation mechanism and porosity development in porous boron nitride ' , Journal of Physical Chemistry C , vol. Articles ASAP . https://doi.org/10.1021/acs.jpcc.1c08565
Journal of Physical Chemistry C
Copyright © 2021 American Chemical Society. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the author created accepted manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1021/acs.jpcc.1c08565
DescriptionThis work was carried out with the support of Diamond Light Source, instrument B07 (proposal SI-26588). We acknowledge the funding from bp-ICAM and the funding from the Engineering and Physical Sciences Research Council (EPSRC) through the CDT in Advanced Characterisation of Materials (2018 NPIF grant EP/S515085/1).
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