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All Journal Jurnal Redoks Indonesian Journal of Material Research
Komis
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Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering

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Analisis Kadar Kalsium Oksida (CaO) Pada Batu Karang Di Pulau Kelagian Kecil Lampung Komis; legasari, leni; Amiliza Miarti; Tantri Oktari; Yuni Melwani
Jurnal Redoks Vol. 9 No. 2 (2024): REDOKS JULI - DESEMBER
Publisher : Universitass PGRI Palembang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31851/redoks.v9i2.14774

Abstract

Batu karang memiliki kandungan kalsium karbonat (CaCO3) tinggi mencapai 95% yang dapat dimanfaatkan sebagai sumber kalsium oksida. Kalsium Oksida (CaO) dapat diperoleh dari CaCO3 melalui reaksi dekomposisi pada suhu tinggi. Tujuan dari penelitian ini adalah untuk menganalisis kadar CaO pada batu karang dan mengetahui karakteristik gugus fungsi CaO pada batu karang. Batu karang yang telah dihaluskan dikalsinasi pada suhu 700°C selama 2 jam, kemudian dikarakterisasi menggunakan spektrofotometer FTIR. Hasil penelitian menunjukkan kadar CaO dari ketiga sampel yaitu 11,1552%; 10,5504 % dan 8,5568 %, dan hasil analisis karakterisasi menggunakan FT-IR menunjukkan adanya gugus fungsi CaO pada ketiga sampel yang berada didekat daerah sidik jari, yaitu pada bilangan gelombang 871 cm-1; 866 cm-1 dan 871 cm-1.
Efficient Desulfurization of 4-Methyldibenzothiophene Using H5PV2Mo10O40/TiO2: A Catalytic Approach Anggraini, Ana; Jefri, Jefri; Komis; Lesbani, Aldes
Indonesian Journal of Material Research Vol. 3 No. 1 (2025): March
Publisher : Magister Program of Material Science Graduate School of Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/ijmr.20253152

Abstract

Oxidation desulfurization (ODS) is an effective method to remove sulfur compounds from fuels by converting them into more polar oxidized forms that are easier to extract. In this study, H₅PV₂Mo₁₀O₄₀/TiO₂ catalysts were synthesized and characterized using FT-IR spectroscopy. The FT-IR spectra confirmed the successful impregnation of polyoxometalate into the TiO₂ matrix, indicated by the appearance of Ti-O and O-Ti-O vibrations, while the typical H₅PV₂Mo₁₀O₄₀ peaks remained detectable. The performance of the H₅PV₂Mo₁₀O₄₀/TiO₂ catalyst in the desulfurization of 4-methyldibenzothiophene (4-MDBT) was studied based on variations in reaction time, catalyst mass, temperature, and amount of H₂O₂. The optimal conditions obtained were a reaction time of 2 hours, a catalyst mass of 0.05 g, a temperature of 60°C, and a volume of H₂O₂ of 5 mL, with a maximum sulfur conversion of 99.0%. These results indicate that H₅PV₂Mo₁₀O₄₀/TiO₂ has potential as an efficient ODS catalyst.
Co-Authors Aldes Lesbani amiliza miarti Anggraini, Ana Jefri Jefri Leni Legasari Tantri Oktari Yuni Melwani