Vol 20, No 3 (2016) > Chemical Engineering >

Characterization and Utilization of Calcium Oxide (CaO) Thermally Decomposed from Fish Bones as a Catalyst in the Production of Biodiesel from Waste Cooking Oil

Aldes Lesbani 1 , Sabat Okta Ceria Sitompul 1 , Risfidian Mohadi 1 , Nurlisa Hidayati 1


  1. Department of Chemistry, Faculty of Mathematics andNatural Sciences, Universitas Sriwijaya, Indralaya Ogan Ilir 30662, South Sumatera, Indonesia


Abstract: Thermal decomposition of fish bones to obtain calcium oxide (CaO) was conducted at various temperatures of 400, 500, 800, 900, 1000, and 1100 °C. The calcium oxide was then characterized using X-ray diffractometer, FTIR
spectrophotometer, and SEM analysis. The calcium oxide obtained from the decomposition at 1000 °C was then used as a catalyst in the production of biodiesel from waste cooking oil. Diffraction pattern of the calcium oxide produced from decomposition at 1000 °C showed a pattern similar to that of the calcium oxide produced by the Joint Committee on Powder Diffraction Standard (JCDPS). The diffractions of 2θvalues at 1000 °C were 32.2, 37.3, 53.8, 64.1, and67.3 deg. The FTIR spectrum of calcium oxide decomposed at 1000 °C has a specific vibration at wave-length 362 cm-1, which is similar to the specific vibration of Ca-O. SEM analysis of the calcium oxide indicated that the calcium oxide’s morphology shows a smaller size and a more homogeneous structure, compared to those of fish bones. Theuse of calcium
oxide as a catalyst in the production of biodiesel from waste cooking oil resulted in iod number of 15.23 g/100 g KOH,
density of 0.88 g/cm3, viscosity of 6.00 cSt, and fatty acid value of 0.56 mg/KOH. These characteristic values meet the National Standard of Indonesia (SNI) for biodiesel.
Keywords: biodiesel, calcium oxide, fish’ bones, waste cooking oil
Published at: Vol 20, No 3 (2016) pages: 121-126

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