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Impact of humidity on HKUST-1 performance for the removal of acetaldehyde in air: an experimental study

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Abstract

In this study, HKUST-1 metal-organic framework was used for the purification of indoor air against acetaldehyde at 460 ppmv under ambient conditions of temperature and humidity. Vapour sorption isotherms of water and acetaldehyde allowed to determine the possible mechanisms of adsorption on HKUST-1. Then, breakthrough curves of acetaldehyde demonstrated the good performance of HKUST-1 for the adsorption of acetaldehyde in dry conditions with a maximum adsorbed capacity of 5.4 mmol.g− 1. Moreover, breakthrough curves of acetaldehyde in moist air (10 and 40% of relative humidity) confirmed that the presence of water strongly impacts the acetaldehyde adsorption. The breakthrough time is reduced by a factor of 3.8 between the experiments with 0% and 40% of relative humidity. In parallel, the adsorption capacity decreases, as the moisture level increases. Thus, at low relative humidity, acetaldehyde is still retained by HKUST-1 but a reduction of the capacity (from 5.4 to 4.3 mmol.g− 1) is observed; whereas, a strong release of the pollutant (maximum output concentration doubled compared to the inlet concentration), leading to a sharp drop of the total adsorbed amount (almost a 90% decrease), appeared at 40% of relative humidity. This acetaldehyde release should be considered as it may impact human health negatively.

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Acknowledgements

The authors would like to thank M. Sébastien Fontana from the Institut Jean Lamour (Nancy) for performing XRD analyses and M. David Farrusseng from the IRCELYON (Lyon) for providing the MOF HKUST-1.

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Correspondence to Léa Sigot.

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Partial financial support was received from the French Ministry of Higher Education, Research and Innovation. The authors have no relevant financial or non-financial interests to disclose.

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François, M., Sigot, L. & Vallières, C. Impact of humidity on HKUST-1 performance for the removal of acetaldehyde in air: an experimental study. Adsorption 28, 275–291 (2022). https://doi.org/10.1007/s10450-022-00368-6

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  • DOI: https://doi.org/10.1007/s10450-022-00368-6

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