Utilization of waste eggshells as humidity adsorbent
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Publication Details
Author list: Pongtonglor P., Hoonnivathana E., Limsuwan P., Limsuwan S., Naemchanthara K.
Publisher: Asian Network for Scientific Information (ANSINET)
Publication year: 2011
Journal: Journal of Applied Sciences (1812-5654)
Volume number: 11
Issue number: 21
Start page: 3659
End page: 3662
Number of pages: 4
ISSN: 1812-5654
eISSN: 1812-5662
Languages: English-Great Britain (EN-GB)
Abstract
The chicken and duck eggshell powders were prepared and heated at 1300ฐC for 4 h. The samples were analyzed by X-Ray Diffraction (XRD). It was found that Calcium Carbonate (CaCO3) from chicken and duck eggshells completely transformed into Calcium Oxide (CaO). Then the samples were placed in a box installed with a hygro-thermometer for humidity adsorption test in the range of 20-75% RH at 25ฐC. Hydration rate for duck and chicken eggshells were 0.0625% RH min-1 (within 880 min) and 0.0482% RH min-1 (within 1140 min) respectively. The results show that CaO from the duck eggshells is a better adsorbent than that of chicken eggshells. Furthermore, after humidity adsorption, CaO obtained from both eggshells were partly transformed into portlandite (Ca(OH)2 was confirmed by the Rietveld refinement method and Scanning Electron Microscope (SEM). ฉ 2011 Asian Network for Scientific Information.
Keywords
Calcium carbonate, Calcium oxide, Eggshell, Humidty adsorption, Hydration rate, Podlandite
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