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Author: search.filters.author.Panpho, PhakakornSubject: search.filters.subject.Adsorbent

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    ADSORPTION OF HEAVY METALS USING BIO-CALCIUM CARBONATE DERIVED FROM A GOLDEN APPLE SNAIL (GAS) SHELL
    (2023-01-01)
    Panpho, Phakakorn
    ;
    Kaewmud, Ketkanok
    ;
    Vittayakorn, Narathip
    ;
    Sumang, Rattiphorn
    In this research studied the use of calcium carbonate (CaCO<sup>3</sup>) from golden apple snail (GAS) shells for application as an absorbent material to remove heavy metals in water sources, which replaces commercial calcium carbonate (CaCO<sup>3</sup>) to reduce production costs and increase waste value. The adsorption of heavy metal contents (such as lead; Pb and Cadmium; Cd), phase formation, and physical characterization of golden apple snail shells were investigated for use as a calcium source in the production of naturally based biomaterials. The samples were calcined between 700°C and 950°C for 5 hr. TG and DTA analysis of samples demonstrated the decomposition of CaCO<sup>3</sup> to CaO. The XRD results demonstrated that natural shell powder has a crystal phase of CaCO<sup>3</sup> with an aragonite structure. Furthermore, the CaCO<sup>3</sup> (calcite phase) was transformed into calcium oxide (CaO) as a component, which showed that the phase transformation depended on the calcination temperature. The adsorption experiments showed good performance at about 99.6%, 99.7%, and 97% removal efficiency in a shorter time for calcined GAS at 700, 800, and 900°C, respectively. This study suggests that the golden apple snail shell could be an effective biomaterial for heavy removal from contaminated water.