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1 2025

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Preparation of oyster shell waste impregnated with bimetal nitrate as a carbon dioxide gasadsorbent to reduce global warming

Puspita Kana, Nabila Dara, Nazar Muhammad, Syahrial, Bakar Noor Hana Hanif Abu

Ecological Engineering & Environmental Technology

2025

Vol. 26, iss. 3

34--41

The increase in greenhouse gas concentrations has intensified the impact of global warming. Oyster shell (OS) as a source of CaCO₃ has been considered as one of the methods to reduce CO₂, which is one of the primary contributors to global warming. Among various approaches, the adsorption method has proven effective in reducing CO₂ emissions. This study aims to produce an adsorbent from oyster shells impregnated with metal nitrates that is selective for CO₂ gas. The adsorbent preparation was carried out using the Successive Incipient Wetness Impregnation (SIWI) method, with the material formulation calculated based on stoichiometric ratios. The metal nitrate concentration was 2.5%wt (for both aluminum and magnesium metal oxides). The resulting adsorbent was characterized using SEM-EDS (morphology) to indicate Al and Mg have been impregnated in oyster shells with 0.5% each. CO₂ capture/adsorption was measured using TGA, and it found OS/Al exhibited the highest weight loss (5%). Therefore, aluminum nitrate impregnation (OS/Al 5’) is the most effective approach for enhancing the CO₂ adsorption capacity of oyster shells.