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All Journal Reaktor Indonesian Journal of Mathematics and Natural Sciences Sinergi Seminar Nasional Teknik Kimia Kejuangan Prosiding Semnastek Journal of Materials Exploration and Findings Makara Journal of Technology
Yuliusman Yuliusman
Departemen Teknik Kimia, Fakultas Teknik Universitas Indonesia Kampus UI Depok
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Mechanical Engineering

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Single-step Synthesis of Activated Carbon from Arabica Spent Coffee Ground using K2CO3 as Activator Agent Mieldan, Ghina Ivana; Yuliusman, Yuliusman
Journal of Materials Exploration and Findings Vol. 3, No. 3
Publisher : UI Scholars Hub

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Abstract

Activated carbon is a nanomaterial that is often used as an effective adsorbent. Activated carbon raw materials can use biomass, such as coffee grounds, which can be found along with the growth of public interest in coffee drinks. Chemical activators are used for activation to increase biomass carbon's adsorption capacity. Using K2CO3 activator to increase the specific surface area of activated carbon is more harmless than KOH. The use of spent coffee grounds as carbon source and food additive K2CO3 as an activator can make food-grade activated carbon that can be used for food. This study aimed to synthesize activated carbon in one-step synthesis by utilizing coffee grounds biomass waste by varying the mass ratio between biomass waste and K2CO3. The activated carbon was characterized using SEM- EDX and iodine numbers. Activated carbon was prepared with spent coffee ground and K2CO3 with the mass ratio of 1:1 gained the largest surface area of 1052 m2.g-1 despite having the lowest yield of 18%.
Fire and Explosion Hazard Risk Analysis of Fuel Transfer Activities at Fuel Terminal “X” Utilizing the Quantitative Risk Analysis (QRA) Method Sulistyawan, Angga Wahyu; Yuliusman, Yuliusman
Journal of Materials Exploration and Findings Vol. 4, No. 2
Publisher : UI Scholars Hub

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Abstract

Fuel transfer operations at Fuel Terminal ‘X’ constitute a critical stage in the energy supply chain, where complex interactions among human, technical, and environmental factors generate inherent risks of fire and explosion. The flammable nature of fuel oil, coupled with the possibility of vapor or liquid releases outcoming by tool failures, connection leaks, or control system malfunctions, underscores the need for robust and proactive risk management strategies. This study aims to evaluate and mitigate these risks by applying Quantitative Risk Assessment (QRA). The assessment utilized the Parts Count method to foercast generic component failure rates and Fault Tree Analysis (FTA) to classify potential failure pathways that could head to hazardous fuel release scenarios. Consequences were modeled with SAFETI software, enabling a detailed examination of thermal radiation spread by fires, overpressures by blasts, and the determination of risk exposure zones for human populations in the vicinity. Further application of control systems like gas leak detectors, flame detectors, and the automatic/manual shutdown and isolation systems reduced the IRPA to an acceptable risk level. These findings emphasize the importance of combining quantitative risk modelling and systematic safety barriers to improve the operational safety. It is anticipated that these results will support the preparation of risk assessment protocols and safety policy guidelines for fuel handling facilities in the oil and gas sector.
Use of activated carbon from NiO modified Polyethylene Terephthalate plastic bottle waste to optimize natural gas storage in Adsorbed Natural Gas (ANG) technology Yuliusman, Yuliusman; Kamilia, Athaya Khanza; Utomo, Anggi Nugroho; Nasruddin, Nasruddin
SINERGI Vol 30, No 1 (2026)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/sinergi.2026.1.022

Abstract

Storage and transportation of natural gas are major challenges in optimizing energy use. To overcome the challenges, Adsorbed Natural Gas (ANG) technology offers a promising alternative for increasing storage capacity at lower pressures. Therefore, this study aims to explore the efficiency of waste polyethylene terephthalate (PET) bottles converted into activated carbon through pre-treatment, carbonization, chemical activation with 4 M KOH, and physical activation using N₂ flow. Modification of activated carbon was carried out using NiO metal impregnation at concentrations of 0.5%, 1%, and 2% to enhance adsorption performance. The results of characterization using iodine number, scanning electron microscopy (SEM), and energy dispersive X-ray spectroscopy (EDS) showed that the 2% NiO-impregnated sample had the highest surface area of 997.65 m²/g. Natural gas adsorption and desorption testing showed that this material achieved the maximum storage capacity of 138.9 g/kg at 28°C and 9 bar, with superior performance compared to non-impregnated samples and several previously reported ANG adsorbents. These results showed that combining NiO modification with KOH-activated PET waste improved methane uptake beyond commercial activated carbons and provided an environmentally sustainable solution for plastic waste valorization. 
Co-Authors Alfi Maghfirwan Ramadhan, Alfi Ananda Putra Sangaji, Ananda Anggara Anggara Anggara Anggara, Anggara Anondho Wijanarko Azwar Manaf Dianursanti Eko Prasetio, Eko Heri Hermansyah Kamilia, Athaya Khanza Kezia Elkardiana, Kezia Kitakawa, Naomi Shibasaki M. Iwan Fermi Mieldan, Ghina Ivana Misri Gozan Momoji Kubo, Momoji Naomi Shibasaki-Kitakawa, Naomi Nasruddin Nasruddin Nata, Pan Ade Nelson Saksono Oktariani, Edma Nadhif Pan Nata, Pan Praswasti P. D.K Wulan, Praswasti P. D.K Rita Arbianti Roekmijati Soemantojo, Roekmijati Roekmijati W. Soemantojo, Roekmijati W. Setijo Bismo Subihi Subihi Subihi Subihi, Subihi Sulistyawan, Angga Wahyu Sutrasno Kartohardjono Tania Surya Utami Toshiy Yonemoto, Toshiy Utomo, Anggi Nugroho Widodo Wahyu Purwanto Widodo Wahyu Purwanto Wijanarko, A. Yulianto Sulistyo Nugroho