W. Nakbanpotea, P. Thiravetyana
This study aims to compare the gold adsorption capabilities of Chlorella vulgaris and rice husk, selected from microorganisms and agricultural waste, with that of activated carbon. Heated-immobilised C. vulgaris and heated rice husk were evaluated for their maximum gold adsorption rates, which were found to be 10.34, 28.22, and 35.88 mg Au/g adsorbent, respectively, for the three adsorbents. FTIR spectrum analysis, thermodynamic studies, and elution tests demonstrated that C. vulgaris and rice husk adsorbed gold through chemical adsorption mechanisms, specifically via co-ordinate covalent bonds. The active functional groups identified on heated-immobilised C. vulgaris included ketone, carboxylate, and ester, while heated rice husk exhibited ketone, carboxylate, and siloxane groups. In contrast, activated carbon primarily functioned through physical adsorption. The elution efficiencies of gold from heated-immobilised C. vulgaris, heated rice husk, and activated carbon were determined to be 100%, 87%, and 41%, respectively. Although heated-immobilised C. vulgaris demonstrated superior eluteability, its total gold adsorption was lower than that of heated rice husk, indicating that heated rice husk could serve as a viable alternative adsorbent for gold–thiourea pre-concentration.
@article{0eda7306-ba68-4256-88bc-bd34ba1c981f,
title={Comparison of gold adsorption by Chlorella vulgaris, rice husk and activated carbon},
author={W. Nakbanpotea and P. Thiravetyana},
year={2002},
language={en}
}TY - JOUR TI - Comparison of gold adsorption by Chlorella vulgaris, rice husk and activated carbon AU - W. Nakbanpotea AU - P. Thiravetyana PY - 2002 LA - en ER -
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