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All Journal Engineering and Technology International Journal (EATIJ) Majalah Teknik Industri Science Get Journal
Herlina Rahim
Program Studi Teknik Kimia Mineral, Politeknik ATI Makassar, Jl Sunu No. 220, Kota Makassar, 90211, Indonesia
Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Mathematics Mechanical Engineering Physics

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Utilization of Waste Crab and Wood Skin As Biodegradable Sariwahyuni Sariwahyuni; Herlina Rahim; Misbahuddin
Engineering and Technology International Journal Vol 4 No 02 (2022): Engineering and Technology International Journal (EATIJ)
Publisher : YCMM

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (535.27 KB) | DOI: 10.55642/eatij.v4i02.216

Abstract

Biodegradable plastics are an important thing to consider in order to meet environmentally friendly plastics. This study aims to determine the potential of crab waste and cassava peel waste as raw material for biodegradable plastics. This research was conducted in the Laboratory of Microbiology Industry at the Technical Industry Academy of Makassar in Januari-April 2022. The research method used was an experimental method with simple statistical analysis techniques. This research uses three parameters : the power of elasticity, resistance to temperature and the ability to decompose. The result that chitosan concentration of 1 gram, 5 grams of starch and cassava peel, 15 ml glycerol gave the best results compared to the two other treatments at 4,623% elongation values​​, degraded faster and has a resistance to temperatures up to 100 ℃ for 2 hours
Peningkatan Kualitas Batubara dengan Menggunakan Pelumas Bekas di PT. Indonesia Power PLTU Barru OMU Muliyana; Herlina Rahim
Majalah Teknik Industri Vol 29 No 2 (2021): Majalah Teknik Industri Desember 2021
Publisher : Unit Penelitian dan Pengabdian Masyarakat (UPPM) Politeknik ATI Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Indonesia Power PLTU Barru OMU menggunakan batubara jenis lignit sebagai bahan bakar pada boiler. Pelumas bekas di PT. Indonesia Power PLTU Barru OMU merupakan salah satu limbah yang belum diolah lebih lanjut yang masih mengandung energi. Untuk meningkatkan kualitas batubara dengan menggunakan pelumas bekas memerlukan suatu metode yang disebut upgrading brown coal. Penelitian ini bertujuan untuk menganalisis kualitas batubara dengan menggunakan pelumas bekas dengan mengukur parameter nilai kalori, nilai total sulfur, kadar moisture, kadar volatile matter, kadar ash content dan kadar fixed carbon pada sampel sebelum dan setelah dilakukan upgrading brown coal. Penelitian ini bersifat eksperimental, yaitu dengan melakukan pengujian kualitas batubara dengan menggunakan pelumas bekas. Berdasarkan penelitian yang telah dilakukan dapat disimpulkan bahwa penggunaan pelumas bekas dapat meningkatkan kualitas batubara melalui proses upgrading brown coal. Hasil pengujian parameter kualitas menunjukkan bahwa sampel kode D memiliki kualitas baik dengan nilai kalori 7252,86 kal/g, nilai total sulfur 0,129%, kadar moisture 3,055%, kadar volatile matter 69,875%, kadar ash content 5,06% dan kadar fixed carbon 22,51%. Namun, sampel kode D tidak mampu menurunkan kadar volatile matter dan menaikkan fixed carbon.
Study on Material Innovation and Electrochemical Performance in Solid-State Battery Technology for Sustainable Energy Applications Herlina Rahim; Rozlinda Dewi; Venny Yusiana; Rismen Sinambela
Science Journal Get Press Vol 3 No 1 (2026): January, 2026
Publisher : CV. Get Press Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.69855/science.v3i1.373

Abstract

Solid-state batteries (SSBs) have gained strong attention for their higher safety, greater energy density, and improved electrochemical stability compared to liquid-electrolyte lithium-ion batteries, although challenges remain in optimizing ionic conductivity, interfacial resistance, and cycling stability. This study investigates the synthesis, structural characteristics, and electrochemical performance of the argyrodite solid electrolyte Li₆PS₅Cl (LPSC), produced via high-energy mechanical milling and integrated into a prototype SSB using a Li-metal anode and NMC811 cathode. XRD analysis confirmed the formation of the cubic argyrodite phase, while SEM revealed a homogeneous particle morphology conducive to efficient ion transport. Electrochemical impedance spectroscopy (EIS) showed an ionic conductivity of 1.87 × 10⁻³ S/cm at 25°C, which increased to 3.41 × 10⁻³ S/cm after annealing at 550°C. Galvanostatic cycling at 0.1C demonstrated stable capacity retention of 92.5% after 50 cycles, indicating strong interfacial contact between the LPSC electrolyte and NMC811 cathode. Comparative evaluation with recent SSB literature shows that the optimized LPSC electrolyte achieves performance levels comparable to state-of-the-art sulfide-based electrolytes due to improved crystallinity and reduced grain-boundary resistance. These results highlight the potential of mechanically milled LPSC as a promising solid electrolyte for next-generation SSB applications.
Fabrication of Hydrophobic Graphene-Cellulose Composite Paper Using Rice Husk Ash Silica Sariwahyuni; Herlina Rahim; Hanim Istatik Badi'ah; Andi Haslinah; Mega Fia Lestari
Science Journal Get Press Vol 2 No 4 (2025): October, 2025
Publisher : CV. Get Press Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.69855/science.v2i4.233

Abstract

This study presents the fabrication and characterization of a sustainable graphene–cellulose composite paper reinforced with rice husk ash (RHA)–derived amorphous silica. Silica was extracted via alkaline leaching–acid precipitation, yielding a porous, high-purity amorphous phase well-suited for reinforcement. Composite papers were prepared by incorporating varying loadings of graphene nanoplatelets (0.5–2 wt%) and silica (5–15 wt%) into cellulose pulp, followed by ultrasonication, vacuum filtration, and hot pressing. Structural and morphological analyses (FTIR, XRD, SEM) confirmed effective dispersion and strong filler–matrix interactions. The incorporation of graphene and silica significantly enhanced surface hydrophobicity, raising the water contact angle from 62.5° for neat cellulose to 152.7°—indicative of a near-superhydrophobic state. Mechanical testing revealed an optimal formulation (1 wt% graphene + 10 wt% silica) that improved tensile strength by 42% and Young’s modulus by 36% compared to neat cellulose. Higher filler concentrations slightly reduced tensile strength due to filler agglomeration. This work demonstrates a valorization pathway for low-cost agricultural residues to produce eco-friendly composite materials with superior mechanical and surface properties, suitable for applications in packaging, filtration, or protective coatings.
Co-Authors Andi Haslinah Hanim Istatik Badi'ah Mega Fia Lestari Misbahuddin Muliyana Rismen Sinambela Rozlinda Dewi Sariwahyuni Venny Yusiana