Toward new low-temperature thermochemical heat storage materials: Investigation of hydration/dehydration behaviors of MgSO4/Hydroxyapatite composite

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 111.3 m2/g and mesopore dimensions centered at 45 nm. composites, prepared by wet-impregnation HAP MgSO4, have lower specific similar as matrix. maximum sorption capacity 0.039 g/g, while (20-MgSO4/HAP) possesses 3.7 times higher due to presence salt in containing 20% MgSO4 achieved highest hydration 464 J/g. long-term cycling (dehydration 150 30 °C relative humidity 60%) confirms comparatively good stability composite.