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All Journal Jurnal Bio-Geo Material Dan Energi Makara Journal of Science
Sarip, Rozie
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Humanities Electrical & Electronics Engineering Energy

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Catalytic Cracking of Used Cooking Oil Using Cobalt-impregnated Carbon Catalysts Prabasari, Ira Galih; Sarip, Rozie; Rahmayani, Suci; Nazarudin,
Makara Journal of Science Vol. 23, No. 3
Publisher : UI Scholars Hub

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This study investigated the cracking of used cooking oil using cobalt-impregnated carbon catalysts (Co-carbon) to produce biofuel. Carbon was impregnated with cobalt at concentrations of 1%, 2%, and 3% to produce Co-carbon catalysts. X-ray diffraction and scanning electron microscopy (SEM) demonstrated the amorphous nature of the catalysts. SEM-energy-dispersive X-ray analysis confirmed the successful impregnation of cobalt into carbon at levels of 4.46%, 6.74%, and 0.86% and further revealed that the Co-carbon catalysts contained pores and that each of them was slightly unique. The cracking procedure was conducted at 450 °C, 500 °C, and 550 °C. Analysis of the catalytic cracking products revealed that the highest liquid oil fraction was obtained by catalytic cracking at 500°C using 1% Co-carbon catalyst, which also provided the lowest activation energy (Ea). Catalytic cracking using 3% Co-carbon provided the highest yield of diesel oil (C12–C18) in the product.
Catalytic Cracking of Methyl Ester from Used Cooking Oil with Ni-Ion-Exchanged ZSM-5 Catalyst Alfernando, Oki; Sarip, Rozie; Anggraini, Titin; Nazarudin, Nazarudin
Makara Journal of Science Vol. 23, No. 4
Publisher : UI Scholars Hub

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Fossil crude reserves continue to decline, eventually leading to a reduced availability of fuel oil in Indonesia. Thus, the use of alternative plant-derived renewable energy sources, such as biodiesel should be considered. However, biodiesel as a fuel alternative has many drawbacks. In this study, biodiesel was cracked using a Ni-ZSM-5 catalyst to improve its quality. This work aimed to synthesize and characterize the Ni-ZSM-5 catalyst obtained from ion-exchange and catalytically crack methyl esters from used cooking oil. Three Ni-metal concentrations (1%, 2%, and 3%) were used for the ion-exchange of ZSM-5. Ni catalysts were then utilized for catalytic cracking at three temperatures (450 ºC, 500 ºC, and 550 ºC). X-ray diffraction and scanning electron microscopy (SEM) analysis showed that the catalyst was in an aggregate form. SEM-energy-dispersive X-ray spectroscopy analysis indicated that Ni was successfully adsorbed by the catalyst. The gravimetry of the catalytically cracked product revealed that the highest oil fraction was obtained using 1% Ni catalyst at 450 ºC. The largest chain obtained with this catalyst was diesel oil (C13-C19) with total 92.96% of covered peak area in the chromatogram/component quantity from gas chromatography.
Green Synthesis of Iron Oxide Nanoparticles Using Suji Leaf (Pleomele Angustifolia) Extract based on Batanghari River Iron Sands Malemna, Ade; Maulana, Lucky Zaehir; Deswardani, Frastica; Anggraini, Rista Mutia; Pujaningsih, Febri Berthalita; Afrianto, Muhammad Ficky; Sarip, Rozie
Jurnal Bio-Geo Material Dan Energi Vol. 6 No. 1 (2026): Vol. 6 No. 1 (2026): Journal of Bio-Geo Material and Energy (BiGME), February 2
Publisher : PUI BiGME Universitas Jambi

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Fe₃O₄ nanoparticles were synthesized via a green route using Pleomele angustifolia leaf extract as a bio-reducing and capping agent. XRD analysis confirmed the structure of pure cubic spinel magnetite phase with nanoscale crystallite sizes, while slight lattice variations indicate surface interactions with phytochemicals. SEM images revealed quasi-spherical nanoparticles with average particle sizes of 53–63 nm, where increasing extract concentration reduced agglomeration and improved dispersion. FTIR spectra showed characteristic Fe–O vibrations together with hydroxyl, carbonyl, and aliphatic functional groups, confirming effective surface functionalization by plant-derived compounds. These results demonstrate that Pleomele angustifolia extract regulates nucleation, growth, and surface chemistry during Fe₃O₄ nanoparticle synthesis, highlighting its potential as a sustainable synthesis route for magnetic nanomaterials.
Co-Authors Afrianto, Muhammad Ficky Anggraini, Rista Mutia Anggraini, Titin Febri Berthalita Pujaningsih Frastica Deswardani Lucky Zaehir Maulana Malemna, Ade Munadi Munadi Oki Alfernando Prabasari, Ira Galih Rahmayani, Suci