Articlegreen2015

Reduction of acidic pollutant gases inside showcases by the use of activated carbon adsorbers

Terje Grøntoft · Paul Lankester · DAVID R. THICKETT

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Conservation Techniques and Studies Adsorption, diffusion, and thermodynamic properties of materials Building materials and conservation

Abstract

Activated carbon adsorbing materials were installed in a number of showcases with heritage objects belonging to English Heritage.The reduction of acetic plus formic acid concentration in air, which could be achieved by the installation of the different adsorbing materials, was investigated.The concentrations of the gases were measured before and after installation of the adsorbers.The reduction in the acetic plus formic acid concentration depended both on the activated carbon adsorbing material which was installed, and on the ventilation rate of the showcases.The installation of carbon cloth, rather than foam, and of foam rather than granulate, and lower ventilation rates gave larger % reduction.The adsorption rate to activated carbon cloth was found to be 1.4 times higher than to activated carbon foam, and 4.4 times higher than to activated carbon granulate.Where activated carbon cloth or foam was installed in showcases with a ventilation rate of two to five air exchanges per day, the reduction in the concentration was from 78 to 96%, to give levels below the recommended target level.Where activated carbon cloth was installed in a showcase with a very high air exchange of 29 per day the reduction was 44 %.Where activated carbon granulate was installed in showcases with air exchanges from four to six per day the reduction was from three to 28%.The expected ventilation dependent concentration of the acids inside the showcases, without and with the adsorbing materials installed, was found with a mass balance box model.From a practical point of view the activated carbon cloth was better to install than the foam, which was better to install than the granulate.Charcoal is easily lost from the adsorbing materials during working and mounting, leaving black particles and dust.

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2020Crystalline Deposits in New Display Cases at the Rijksmuseum: Characterisation and Origin 2020Understanding air-tight case environments at the National Museum of the American Indian (Smithsonian Institution) by SPME-GC-MS analysis 2022Determining the level of organic acid air pollution in museum storage rooms by mass-balance modelling 2021Different low-cost materials to prevent the alteration induced by formic acid on unstable glasses 2020Off-gassing Woodblock Prints - Storage Impact Considerations and Mitigation Strategies -2025Preliminary Assessment of Air Pollution in the Archaeological Museum of Naples (Italy): Long Term Monitoring of Nitrogen Dioxide and Nitrous Acid

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