A new two-component (composite) water sorbent MgSO4 /Hydroxyapatite has been developed for sorption-based solar heat storage. The matrix of the composite is a hydroxyapatite (HAP) material with ordered structure, high surface area of 111.3 m(2)/g and mesopore dimensions centered at 45 nm. The composites, prepared by wet-impregnation of HAP with MgSO4, have lower specific surface area and similar mesopore dimensions as the matrix. The maximum water sorption capacity of HAP is 0.039 g/g, while the composite (20-MgSO4/HAP) possesses 3.7 times higher maximum water sorption capacity due to the presence of the salt in the matrix. The HAP composite containing 20% MgSO4 achieved the highest heat of hydration 464 J/g. A long-term cycling (dehydration at 150 and hydration at 30 degrees C at a relative humidity of 60%) confirms a comparatively good stability of the composite.

Toward New Low-Temperature Thermochemical Heat Storage Materials: Investigation of Hydration/Dehydration Behaviors of MgSO4/Hydroxyapatite Composite / M.H. Nguyen, M. Zbair, P. Dutournié, A. Gervasini, C. Vaulot, S. Bennici. - In: SOLAR ENERGY MATERIALS AND SOLAR CELLS. - ISSN 0927-0248. - 240:(2022 Jun 15), pp. 111696.1-111696.14. [10.1016/j.solmat.2022.111696]

Toward New Low-Temperature Thermochemical Heat Storage Materials: Investigation of Hydration/Dehydration Behaviors of MgSO4/Hydroxyapatite Composite

A. Gervasini;
2022

Abstract

A new two-component (composite) water sorbent MgSO4 /Hydroxyapatite has been developed for sorption-based solar heat storage. The matrix of the composite is a hydroxyapatite (HAP) material with ordered structure, high surface area of 111.3 m(2)/g and mesopore dimensions centered at 45 nm. The composites, prepared by wet-impregnation of HAP with MgSO4, have lower specific surface area and similar mesopore dimensions as the matrix. The maximum water sorption capacity of HAP is 0.039 g/g, while the composite (20-MgSO4/HAP) possesses 3.7 times higher maximum water sorption capacity due to the presence of the salt in the matrix. The HAP composite containing 20% MgSO4 achieved the highest heat of hydration 464 J/g. A long-term cycling (dehydration at 150 and hydration at 30 degrees C at a relative humidity of 60%) confirms a comparatively good stability of the composite.
Adsorption kinetics; Hydroxyapatite; Magnesium sulfate; Thermochemical storage of solar heat; Water sorption;
Settore CHIM/02 - Chimica Fisica
Settore CHIM/03 - Chimica Generale e Inorganica
15-giu-2022
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/1040528
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