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All Journal JURNAL KIMIA SAINS DAN APLIKASI ALCHEMY Jurnal Penelitian Kimia Sangia : Jurnal Penelitian Arkeologi (Journal of Archaeology Research) Jurnal Penelitian Pendidikan Fisika Advance Sustainable Science, Engineering and Technology (ASSET) Prosiding Seminar Nasional Pengabdian kepada Masyarakat (SINAPMAS) Advance Sustainable Science, Engineering and Technology (ASSET) International Journal of Acta Material
La Ode Ahmad
Department Of Chemistry, Universitas Halu Oleo, Kampus Hijau Bumi Tridharma, Anduonohu , Kendari 93232, Indonesia.
Arts Humanities Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Physics Social Sciences

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Optimisation of Asphalt Extraction from Asbuton Using Microwave-Assisted Extraction (MAE) Method Hikmayani; I W. Sutapa; Sahidin; L. O. Ahmad
International Journal of Acta Material Vol. 2 No. 1 (2025): August 2025
Publisher : Faculty Mathematics and Natural Sciences, Halu Oleo University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62749/ijactmat.v2i1.19

Abstract

Buton natural asphalt (Asbuton) is a strategic non petroleum bitumen resource with promising potential in road construction. However, conventional extraction methods such as Soxhlet and reflux suffer from long processing times, high energy demand, and excessive solvent use. This review evaluates Microwave-Assisted Extraction (MAE) as a green and efficient alternative for extracting bitumen from Asbuton. MAE employs rapid dielectric heating, enabling selective bitumen release while minimizing solvent consumption. Key process variables, including solvent polarity, solid-to-solvent ratio, temperature, extraction time, microwave power, and system pressure are critically reviewed. Comparative data show that MAE significantly improves extraction yield and operational efficiency. In addition, Response Surface Methodology (RSM) is discussed as a modeling tool to optimize variable interactions and identify ideal extraction conditions. Visual aids such as flow diagrams and comparative tables are used to clarify performance metrics and technical constraints. The review also outlines major challenges in MAE implementation, including microwave penetration in low-dielectric matrices and the need for scalable reactor designs. Overall, this paper provides a comprehensive perspective on MAE-based extraction for Asbuton, offering insight into its advantages, limitations, and directions for future research and industrial application.
Green Bioconversion of Asbuton Bitumen into Hydrocarbon-Rich Oil by Trichoderma sp. Based on GC–MS Characterization A. Johan; I. Sulistiyani; A. L. Giri Toba; A. H. Watoni; L. O. A. Nur Ramadhan; C. Baskar; L. O. Ahmad
International Journal of Acta Material Vol. 2 No. 2 (2026): February 2026
Publisher : Faculty Mathematics and Natural Sciences, Halu Oleo University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62749/ijactmat.v2i2.27

Abstract

This study presents a green bioconversion process for upgrading Buton natural bitumen (Asbuton) into hydrocarbon-rich bio-oil using Trichoderma sp. as a biological catalyst under mild conditions. The effects of composition ratio and incubation time on oil yield and physicochemical properties were investigated. The optimum condition was achieved at a 2:5 bitumen-to-fungus ratio after 25 days of incubation, producing a 4.74% yield with a density of 0.949 g cm⁻³, a viscosity of 3.83 Pa·s, a flash point of 69.6 °C, and a calorific value of 5412 Cal.g⁻¹. GC–MS analysis revealed forty peaks dominated by C16–C18 fatty acids, confirming the partial oxidative–hydrolytic depolymerization of asphaltic hydrocarbons into oxygenated aliphatic molecules. The decrease in viscosity and the appearance of long-chain fatty acids indicated efficient enzymatic degradation of heavy asphaltenes. These findings demonstrate that Trichoderma sp. effectively converts solid Buton bitumen into bio-oil under ambient conditions, highlighting its potential as a green, low-energy alternative for sustainable biofuel production.
Study of Equilibrium and Kinetics of Ag(I) Metal Ions Adsorption on Carbon Nanofibers and Its Potential Test as X-Ray Anti-Radiation Material L. O. Ahmad; W. O. A. Sulastri; Alimin; L. O. A. N. Ramadhan; H. Ritonga; Alwahab Alwahab; S. J. Sentosa; A. A. Umar
International Journal of Acta Material Vol. 2 No. 2 (2026): February 2026
Publisher : Faculty Mathematics and Natural Sciences, Halu Oleo University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62749/ijactmat.v2i2.33

Abstract

X-ray radiation is an electromagnetic wave with short waves and has been widely used in the medical world, if excessive use can cause harm to the body.  The purpose of this research are to know adsorption capacity and kinetics of CNFs adsorption to Ag (I) metal ion and its potential test as X-ray anti-radiation material. This research uses liquid phase adsorption method with the help of ultrasonic wave in the process of attaching metal ion Ag (I) with CNFs as adsorbent. The result,  showed the optimum adsorption process at 60 minutes, pH 8 and concentration of 20 mg/L. Ag(I) metal ions on CNFs maximum adsorption capacity was 398.4064  mg/g, with the adsorption process followed pseudo second order adsorption kinetics model. XRD test results in decreasing intensity after attachment of Ag (I) ions on CNFs and the potentially serve as X-ray anti radiation material.
Dual-Chamber Microbial Fuel Cell for Bioelectricity Generation Using Coastal Sediments: A Case from Kendari Bay La Ode Ahmad; Muhammad Iqbal Sya'bani Istianandar; Wa Ode Novi Haryanti; Ahmad Zaeni; Alwahab; La Ode Ichlas Syahrullah Yunus; Yusuf Ahmad Husaeni; Robby Sudarman
Advance Sustainable Science Engineering and Technology Vol. 7 No. 4 (2025): August-October
Publisher : Science and Technology Research Centre Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/asset.v7i4.2086

Abstract

This study evaluates the potential of Kendari Bay sediment as an alternative source of electrical energy through the dual-chamber Sediment Microbial Fuel Cell (SMFC) technology. The research focused on sediment characterization, performance analysis using an aerator and KMnO₄, post-operation substrate changes, and the identification of electrogenic bacteria. The results showed that the sediment contained 43.24% moisture, 4.23% organic carbon, 1.08% total nitrogen, a C/N ratio of 3.92, pH 7.38, and conductivity of 11.56 mS. The SMFC generated a voltage of 0.404 V (aerator) and 1.628 V (KMnO₄), along with a current of 5.0 µA. After SMFC operation, organic content decreased, with 42.65% moisture, 4.06% organic carbon, 0.97% total nitrogen, a C/N ratio of 4.19, pH 7.86, and conductivity of 15.78 mS. Identified bacteria were Gram-positive Bacillus spp. These findings demonstrate that aerator and KMnO₄ application in dual-chamber SMFC significantly enhance energy conversion efficiency using marine sediment.
Co-Authors A. A. Umar A. H. Watoni A. Johan A. L. Giri Toba A. Zaeni Ahmad Zaeni Ahmad Zaeni, Ahmad Alimin Alimin Alimin Alimin, Alimin Alwahab Alwahab Alwahab C. Baskar Darwin Ismail F. Muhamad Fahmiati Fahmiati Fajrin E. Rosa H. Hidayat H. Ritonga Hikmayani I W. Sutapa I. Sulistiyani Indriana Kartini Intan Intan Isra Isra Keke Awaliyah L. O. A. N. Ramadhan L. O. A. N. Ramadhan L. O. A. Nur Ramadhan La Agusu La Ode Abdul Kadir La Ode Ahmad Nur Ramadhan La Ode Ichlas Syahrullah Yunus La Ode Kadidae Laode Abdul Kadir Laode Abdul Kadir Maharani, Pratitis Tri Muhammad Iqbal Sya'bani Istianandar Mukhlis, Rasniaty Muzakkar, Muhammad Zakir Nasriadi Dali Nur K., Wa Ode Miranda PRIMA ENDANG SUSILOWATI R. Suhardiman Robby Sudarman S. J. Sentosa Sahidin Sahidin Sri Juari Santosa THAMRIN AZIS W. O. A. Sulastri W. O. Haerunnisah W. O. N. Haryanti Wa Ode Novi Haryanti Wahyu Yusuf Ahmad Husaeni