HANDY AND SUSTAINABLE METHOD OF NANO-Ca(OH)2 SYNTHESIS USED IN CONSERVATION AND CONSOLIDATION WORKS

The heritage conservation always remains a scientific and complex task. Either used for preservation of cellulose-based artifacts or as limestone consolidant, the nano-Ca(OH)2 is often associated with its carbonation process. The use of waste materials for nano-Ca(OH)2 synthesis transforms the entir...

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Bibliographic Details
Published in:International journal of conservation science 2020-04, Vol.11 (2), p.531-538
Main Authors: Moncea, Mihaela-Andreea, Deák, György, Panait, Ana-Maria, Baraitaru, Andreea Georgiana, Dumitru, Florina-Diana
Format: Article
Language:English
Subjects:
Calcium chloride
Calcium hydroxide
Carbonation
Cellulose
Chemical reactions
Conservation
Differential thermal analysis
Egg shells
Ethanol
Fluorescence
Limestone
Morphology
Nanoparticles
Scanning electron microscopy
Slaked lime
Sodium hydroxide
Synthesis
Waste materials
X-ray diffraction
X-ray fluorescence
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Summary:The heritage conservation always remains a scientific and complex task. Either used for preservation of cellulose-based artifacts or as limestone consolidant, the nano-Ca(OH)2 is often associated with its carbonation process. The use of waste materials for nano-Ca(OH)2 synthesis transforms the entire process into a handy and sustainable one. Within this study, the calcium hydroxide nanoparticles have been synthesized from eggshell wastes through the precipitation method. For this purpose the raw eggshells were washed for organic traces removal and disolved in concentrated HCl solution to form CaCl2. The nano-Ca(OH)2 was obtained by adding into the chemical reaction media a solution of NaOH, the white precipitate being afterwards dried at 100°C for two hours. The synthesized nanoparticles were characterized by X-Ray fluorescence (XRF), scanning electron microscope (SEM), X-Ray diffraction (XRD), thermal analyses (DTA-TG) and laser granulometry using as comparative specimen a commercial calcium hydroxide. The granulometer analyses showed that the particle size of the obtained nano-Ca(OH)2 was in the range 10 - 150nm, these results being also confirmed by SEM images.
ISSN:2067-533X
2067-8223