Article
PENGARUH PERLAKUAN PANAS MICROWAVE TERHADAP STRUKTUR KRISTAL DAN GUGUS FUNGSIONAL CACO₃ DARI CANGKANG KERANG HIJAU: ANALISIS XRD DAN FTIR
Dinamika : Jurnal Ilmiah Teknik Mesin, Vol. 16 No. 2 (2025), hlm. 291–297
Abstrak
Calcium carbonate (CaCO₃) is an inorganic compound commonly found in biominerals, one of which is the shell of the green mussel (Perna viridis). A widely used thermal treatment method is calcination using a furnace. However, the application of microwave-based heating as an alternative calcination technique has been rarely reported. This study aims to evaluate the effect of microwave heating on the phase transformation and chemical structure of CaCO₃ extracted from green mussel shells. Characterization using X-ray Diffraction (XRD) revealed a significant phase transformation, from a mixture of aragonite, calcite, and vaterite to a dominant aragonite phase of 97.7%, with a decrease in calcite content to 2.1% and the disappearance of vaterite. Fourier Transform Infrared Spectroscopy (FTIR) analysis showed a decrease in the intensity of carbonate (CO₃²⁻) bands and the disappearance of hydroxyl (–OH) groups, indicating dehydration and the onset of thermal decomposition. The detection of a minor Ca(OH)₂ phase at 0.2% suggests a possible reaction between partially decomposed products and water vapor during heating. These findings indicate that microwave technology holds potential as an alternative method for modifying the structure and phase of calcium carbonate-based biominerals.