PENGARUH RASIO PERENDAMAN H₂O₂ TERHADAP PERUBAHAN SIFAT PSHYCICOCHEMICAL CaCO₃ YANG DIEKSTRAK DARI CANGKANG KERANG HIJAU

Abstrak

The Effect of H₂O₂ Immersion Ratio on the Physicochemical Properties of CaCO₃ Extracted from Green Mussel Shells]. Green mussel shells are one of the abundant biomineral waste materials, rich in calcium carbonate (CaCO₃) content. This compound has the potential to be converted into calcium oxide (CaO), which can further be transformed into calcium phosphate compounds with higher application value. This study aims to determine the effect of calcination-ultrasonication on the crystallinity and functional groups of calcium carbonate (CaO) derived from green mussel shells. This study aims to investigate the effect of H₂O₂ soaking ratio in the calcination-ultrasonication process on the physicochemical properties of calcium carbonate (CaO) derived from green mussel shells. The results showed that H₂O₂ treatment influenced the intensity of functional groups and crystal structure, with a detected phase transformation from aragonite to portlandite, indicating the decomposition and hydration of CaCO₃ during the process. The FTIR spectrum of the sample before calcination (SP1) showed the presence of hydroxyl groups (3448.72 cm⁻¹) and C-H, indicating the existence of water and organic compounds such as proteins and fats. After the calcination process, the spectrum of SP2 revealed the disappearance of C-H groups and the appearance of residual moisture peaks around 3737.03 and 3699.51 cm⁻¹, while carbonate groups were still detected at 1473.96 cm⁻¹. This indicates that the calcination process successfully removed organic compounds but did not fully convert CaCO₃ into CaO, suggesting that a higher temperature is required to improve decomposition efficiency. Keywords: green mussel shells, functional groups, crystallinity, calcination-ultrasonication, calcium carbonate