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All Journal Indonesian Journal of Chemical Science Chemical Engineering Journal Storage (CEJS) Jurnal Pengabdian Masyarakat dan Riset Pendidikan Serambi Engineering
Anerasari Meidinariasty
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Humanities Chemical Engineering, Chemistry & Bioengineering Chemistry Earth & Planetary Sciences Education Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Mathematics Other

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Journal : Serambi Engineering

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Pemanfaatan Cangkang Kemiri Sebagai Katalis CaO (Candlenut Shell) yang Terimpregnasi KOH dalam Produksi Biodiesel Minyak Jelantah melalui Reaksi Transesterifikasi Nur Sha’in; Anerasari Meidinariasty; Akbar Ismi Aziz Pramito
Jurnal Serambi Engineering Vol. 11 No. 1 (2026): Januari 2026
Publisher : Faculty of Engineering, Universitas Serambi Mekkah

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The growing demand for environmentally friendly and renewable alternative fuels, with biodiesel being a prominent candidate. Waste cooking oil (WCO), a widely available household waste, is a promising feedstock but requires an efficient catalyst to improve the transesterification process. The objective of this research was to investigate the effect of CaO catalyst derived from candlenut shells impregnated with KOH, and to determine the optimum methanol-to-oil molar ratio and catalyst concentration. The results showed that the optimum condition was achieved at a 1:6 molar ratio with 1.5% catalyst, producing biodiesel with a density of 0.877 g/mL, viscosity of 4.6 cSt, acid value of 0.25 mg KOH/g, cetane number of 54.7, and yield of 85%, all in accordance with the Indonesian National Standard (SNI 7182:2015). GC-MS analysis revealed a total fatty acid methyl ester (FAME) content of 99.57%, dominated by compounds such as methyl oleate, methyl stearate, and methyl linoleate, indicating near-complete conversion. These findings confirm the potential of CaO-KOH catalyst from candlenut shell waste as an effective heterogeneous catalyst for producing high-quality and sustainable biodiesel.
Ekstraksi Silika Gel dari Ampas Tebu dan Sekam Padi dengan Variasi Konsentrasi NaOH dan Rasio Bahan Baku Sania, Rasty; Anerasari Meidinariasty; Cindi Ramayanti
Jurnal Serambi Engineering Vol. 11 No. 1 (2026): Januari 2026
Publisher : Faculty of Engineering, Universitas Serambi Mekkah

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The growing demand for environmentally friendly and sustainable materials has encouraged the exploration of agricultural waste as an alternative source of silica gel. Conventional silica gel production relies on quartz sand, which is non-renewable and requires high energy consumption. In this study, sugarcane bagasse ash and rice husk ash were utilized as potential raw materials due to their high silica content. The objective was to examine the influence of different raw material ratios and NaOH concentrations on the characteristics of the synthesized silica gel. The synthesis process involved calcination at 700°C for 4 hours, alkaline extraction using NaOH solutions (1.5 M, 2 M, and 2.5 M), and precipitation with H₂SO₄ (0.5 M), followed by drying at 110°C. The obtained silica gel was characterized for moisture content, water adsorption capacity, pH, and functional groups using FTIR spectroscopy. FTIR analysis revealed the presence of siloxane (Si–O–Si) and silanol (Si–OH) groups, confirming the successful formation of silica gel. The optimal composition was achieved at a ratio of 75% rice husk to 25% sugarcane bagasse with 2.5 M NaOH, resulting in the lowest moisture content (0.07%) and the highest water adsorption capacity (41%). These findings demonstrate that the high silica content in rice husk and appropriate alkali concentration enhance gel structure formation and improve adsorption performance.
Co-Authors Akbar Ismi Aziz Pramito Anggi Dwi Chandrika Cindi Ramayanti Erika Dwi Oktavianti Marieska Lupikawaty Martha Aznury Miskiyah, Neneng Muhammad Yerizam Nur Rahma, Alycia Nur Sha’in Sania, Rasty