Calcium Carbonate (CaCO3) From Pearl Clam Shells (Pinctada maxima) Lombok as Potential Thermochemical Energy Storage (TCES) Material

Nazarudin Nazarudin (Universitas Jambi)
Frastica Deswardani (Universitas Jambi)
Nova Kafrita (Universitas Jambi)
Susilawati Susilawati (University of Mataram)
Rista Mutia Anggraini (Universitas Jambi)
Lucky Zaehir Maulana (Universitas Jambi)
Fathan Bahfie (Research Center of Mining Technology -National Research and Innovation Agency of Indonesia)
Indri Badria Adilina (Research Centre for Chemistry, National Research and Innovation Agency)
Richard Walton (Universitasof Warwick)
Volkan Degirmenci (Universitasof Warwick)

AMPLITUDO: Journal of Science & Technology Innovation
Vol. 5 No. 2 (2026): August

The study focused on preparing and characterizing Calcium Carbonate (CaCO3) derived from the shells of Lombok pearl oysters (Pinctada Maxima). The objective was to assess the potential of these shells as raw material for Thermochemical Energy Storage (TCES). The research involved calcination pearl oyster shells at different temperatures: 600°C (CKM 1), 700°C (CKM 2), and 800°C (CKM 3). XRD analysis revealed that these samples contained CaCO3 with a calcite phase and a Rhombohedral crystal system (R-3C). The crystalline sizes for CKM 1, CKM 2, and CKM 3 were 53.70 nm, 57.05 nm, and 40.07 nm, respectively. Furthermore, pearl oyster shell samples were combined with Ludox. XRD results for samples subjected to filltering treatment (CKM 4) and heating treatment with a stirrer on a hotplate (CKM 5 and CKM 6) and calcined at 600°C and 700°C also indicated the presence of CaCO3. The crystalline size for CKM 4, CKM 5, and CKM 6 was measured at 55.50 nm, 55.51 nm, and 55.51 nm, respectively. CaCO3 from Pearl oyster shells have direct band with the value between 2.1 - 2.9 eV.