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Jurnal Teknologi
Published by Politeknik Negeri Lhokseumawe
ISSN : 14121476     EISSN : 25500961     DOI : http://doi.org/10.30811/teknologi
Core Subject : Science, Engineering,
Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Electrical & Electronics Engineering Mechanical Engineering
Jurnal Teknologi is a peer-reviewed journal that aims at the publication and dissemination of original research articles on the latest developments in all fields of technology and engineering sciences. The journal publishes original papers in Indonesian and English, which contribute to the understanding of engineering science and the improvement of engineering technology. Papers may be theoretical, experimental, or both, and applied engineering science and technology. The articles submitted to Jurnal Teknologi should be unpublished before and not under consideration for publication elsewhere. The scope of Jurnal Teknologi includes a wide spectrum of technology and engineering science subjects including: Civil engineering; Mechanical engineering; Chemical engineering Electrical engineering; Information and technology; Computer science and engineering; Materials science and engineering; Renewable energy engineering;
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 136 Documents
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Pembuatan Kulit Biosintetis dari Nata De Banana menggunakan Polyurethane dan Anti Bakterial Chitosan Nurmila, Nurmila; Rahmahwati, Cut Aja; Elwina, Elwina
Jurnal Teknologi Vol 25, No 1 (2025): April 2025
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/teknologi.v25i1.6373

Abstract

Organic synthetic leather is engineered leather created with raw materials that can be found around the human environment in the form of fruits or fruit peels which have high fiber so that they can deal with organic waste, with organic synthetic leather the population of animals killed for their skins reduced so as to maintain the survival of animals. This study aims to determine the effect of the addition of polyurethane (PU) and chitosan on the characteristics of the resulting leather. With variation (Polyurethane A) 2 : 1 (Polyurethane B), namely 15 mL, 30 mL, 45 mL, 60 mL, 75 mL and chitosan 2 g, 4 g, 6 g, 8 g, 10 g. The addition of PU affects the elasticity and hardness of the final leather product and chitosan has the effect of inhibiting bacterial growth and fungus on synthetic leather. The organoleptic test for all synthetic leather does not meet SNI standards. Based on the results of anti-bacterial testing (colony counter) there were the highest bacteria in the lowest chitosan variation, namely 2 grams and the lowest bacteria in the highest chitosan variation, namely 10 grams. The result of the tensile strength test is that the highest tensile strength value is produced by PU (2:1) at 50:25 ml polyurethane volume of 3.432 MPa with 21.36% elongation and the lowest tensile strength value is produced by PU (2:1) at 15 volume : 8 mL of 16.181 MPa elongation 21.42%.
Removal of Artificial Rhodamine B Synthetic Dye Waste Using Magnetic Nanoparticle Adsorbents Irwan, Irwan; Mardani, Mardani; Sari, Husna; Safitri, Aida; Zaini, Halim
Jurnal Teknologi Vol 25, No 2 (2025): Agustus 2025
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/teknologi.v25i2.7397

Abstract

The use of synthetic dyes as dyes is increasing so that the waste is polluting the environment. One of the dangerous wastes that damages the environment and causes health problems is rhodamine B dye. The removal of rhodamine B dye is carried out by adsorption using an adsorbent that has been modified to provide magnetic properties. The aim of the research is to synthesize magnetic adsorbent nanoparticles using the co-precipitation method and use them to reduce the concentration of rhodamine B dye in artificial wastewater at various time variations. The study shows that magnetic nanoparticle adsorbents were successfully synthesized using the precipitation method. The adsorbent particles provide a magnetic effect on external magnetic forces, which shows that the adsorbent nanoparticles are magnetic. The application of magnetic adsorbent nanoparticles showed that the longer the adsorption time, the percentage of rhodamine B dye removal increased. The highest removal was obtained at 86% at an adsorption time of 90 minutes and an adsorbent mass of 4 g.
Purifikasi Biodiesel Berbasis Minyak Jelantah Secara Fisika dengan Metoda Pencucian Kering Maghfirah, Rahmah; Zulkifli, Zulkifli; Ridwan, Ridwan
Jurnal Teknologi Vol 25, No 2 (2025): Agustus 2025
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/teknologi.v25i2.7534

Abstract

This study aims to purify waste cooking oil-based biodiesel using a dry washing method via centrifugation as a more environmentally friendly alternative to conventional water washing. The process was conducted by varying the centrifuge rotational speeds at 1,050 rpm, 1,150 rpm, 1,250 rpm, and 1,350 rpm, as well as centrifugation durations of 12, 14, 16, 18, and 20 minutes. The effects of these parameters were evaluated based on biodiesel yield, density, kinematic viscosity, and flash point. The results indicated that increasing both the rotational speed and centrifugation time had a significant impact on biodiesel quality. The optimum condition was achieved at 1,150 rpm for 16 minutes, yielding 72% biodiesel with a density of 0.87 g/mL, a kinematic viscosity of 4.7 mm²/s, and a flash point of 102 °C. All parameters met the applicable biodiesel quality standards. These findings demonstrate that the dry washing method using centrifugation is effective in removing contaminants and improving the physical properties of the fuel, making it a practical solution for processing biodiesel from waste-based feedstocks. Moreover, this method has the potential to reduce water usage and minimize wastewater generation, making it a more environmentally sustainable option
Tannin Test on Celery Leaves (Apium graveolens L.) Using UV-Vis Spectrophotometry Method as an Active Ingredient in Hand Sanitizer Adelina, Dina; Adlin, Irman Ansari; S, Agustina Dyah; Junita, Rusnia
Jurnal Teknologi Vol 25, No 2 (2025): Agustus 2025
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/teknologi.v25i2.6845

Abstract

This study looks into whether celery leaves (Apium graveolens L.) could be used as a source of tannins for making hand sanitizer. This study attempts to find a natural antibacterial agent that can be used instead of hand sanitizers, which are in high demand during the COVID-19 pandemic. The goal was to measure the amount of tannins in celery leaves and see how well they work in hand sanitizers. We used the UV-Vis spectrophotometry approach to find out how much tannin there was, using quercetin as a benchmark. We used maceration with 96% ethanol to get the tannins out, and then we distilled them. The results showed that there was a strong linear association between absorbance and tannin concentration. The average tannin content was 0.1397 mg/g. Then, the celery leaf extract was added to hand sanitizer gels. Successful organoleptic testing showed that the composition was physically stable and had antibacterial properties. This study shows how to use local plant materials, such celery leaves, to make hand sanitizers that are good for the environment and work well. This is a better option than chemical-based solutions. The results show that this method could work on other plants with similar traits.
Potensi Ekstrak Kunyit sebagai Inhibitor Korosi Ramah Lingkungan untuk Baja Karbon Rendah Sajida, Gita Nur; Krista, Gustin Mustika; Sari, Hermin Kartika; Taufiqurohim, Teguh; Ferawati, Yohana Fransiska; Sihombing, Rony Pasonang
Jurnal Teknologi Vol 25, No 2 (2025): Agustus 2025
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/teknologi.v25i2.7483

Abstract

Corrosion is a significant metal degradation problem causing substantial economic losses, particularly in the oil and gas industry. Traditional chromate-based inhibitors are toxic, spurring the search for eco-friendly alternatives. This article explores the potential of Curcuma longa (turmeric) extract as a natural corrosion inhibitor for low-carbon steel plates in acidic and basic media. This study tests turmeric extract on low-carbon steel plates in HCl and NaOH media using immersion test (weight loss). The active compound curcumin in turmeric extract effectively inhibits corrosion. Its effectiveness is highly dependent on the solvent type and concentration; 0.25% NaOH yields up to ~87% effectiveness at 1000 ppm turmeric concentration, with a corrosion rate of 0.697 mdd, significantly outperforming 0.25% HCl which only reaches ~22% at similar concentrations with a corrosion rate of 133.99 mdd. Increasing NaOH concentration to 0.50% drastically enhances initial effectiveness, reaching ~63% at 100 ppm, and 90% at 400 ppm, with the corrosion rate dropping to 0.668 mdd. 
Pemanfaatan Fly Ash sebagai Filler Campuran Reclaimed Asphalt Pavement (RAP) pada Pembuatan Daur Ulang Asphalt Concrete – Wearing Course (AC-WC) Sulaiman, Sulaiman; Kurniati, Kurniati; Zhuha, Farah
Jurnal Teknologi Vol 25, No 2 (2025): Agustus 2025
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/teknologi.v25i2.6713

Abstract

Reclaimed Asphalt Pavement is a waste from dredging pavement that has been damaged due to the expiration of its planned life or excessive traffic loads. The demolition material comes from Medan - Banda Aceh road, Besitang, North Sumatra, demolished using Cold Milling Machine. Research was conducted to handle Reclaimed Asphalt Pavement using the recycling method. The research used Reclaimed Asphalt Pavement by adding fly ash as filler to determine the mixture characteristics and Marshall parameter values as recycled Asphalt Concrete - Wearing Course mixture. The research method follows the general standard specifications applicable to Asphalt Concrete - Wearing Course. The extraction results obtained the asphalt content in Reclaimed Asphalt Pavement of 4.75% with aggregate gradation according to specifications. The Optimum Asphalt Content used was 5.9. The total weight of filler is 7.87%, fly ash as a substitute material for filler with a percentage of fly ash addition of 0%, 4%, 6%, 7% and 8% of the total weight of filler. In the 0%, 4%, 6%, 7% and 8% fly ash mixture, the values of stability, flow, Marshall Quotient, Void In Mineral Aggregate, and Void Filled with Bitumen meet the required specifications. While the Void In Mix value is greater than required.
Pengaruh Kombinasi Agregat Halus dan Volume Foam terhadap Sifat Mekanik Beton Busa Naifah, Naifah; Sabila, Ghaitsa Zahira; Bahri, Syamsul; Miswar, Khairul
Jurnal Teknologi Vol 25, No 2 (2025): Agustus 2025
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/teknologi.v25i2.7551

Abstract

Lightweight concrete is defined as concrete utilizing lightweight aggregates or a combination of fine aggregates and natural sand, with a maximum density not exceeding 1850 kg/m³. Recent advancements in foam concrete—a cement-based material with a density range of 400–1850 kg/m³—have expanded its applications in structural and non-structural components. This study investigates the effect of fine aggregate particle size and foam volume on the compressive strength of lightweight foam concrete. Fine aggregates with particle sizes of 4.75 mm, 2.36 mm, and 1.18 mm were used, corresponding to target densities of 800 kg/m³, 1000 kg/m³, and 1200 kg/m³. The mix design was based on the Absolute Volume Method, following ASTM C29 and SNI standards. Experimental results indicate that the use of 4.75 mm aggregate resulted in the highest percentage increase in compressive strength across all dencity levels, namely 1.50% at 800 kg/m³, 2.08% at 1000 kg/m³, and 1.34% at 1200 kg/m³. At the highest density (1200 kg/m³), where foam content was minimized, the increase in compressive strength was more stable, recorded at 1.06% for 1.18 mm sand, 1.28% for 2.36 mm sand, and 1.34% for 4.75 mm sand. The findings highlight that both aggregate gradation and foam volume significantly affect the mechanical performance of foam concrete, with coarser aggregates offering better strength performance, particularly at higher densities.
Pengaruh Penggunaan Limbah Plastik HDPE dalam Campuran Aspal AC-BC sebagai Bahan Daur Ulang ST., MT, Syaifuddin Din; Kurniati, Kurniati; Dahri, Wulan
Jurnal Teknologi Vol 25, No 2 (2025): Agustus 2025
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/teknologi.v25i2.7040

Abstract

The use of plastic waste as an additive in asphalt mixtures presents a promising solution to reduce environmental pollution while enhancing the performance of asphalt mixtures. This study aims to investigate the effect of adding High-Density Polyethylene (HDPE) plastic waste on the Marshall characteristics of Asphalt Concrete – Binder Course (AC-BC) mixtures. Post consumer recycled plastics are being considered for construction to address the threat of plastic waste materials and to improve sustainability. Asphalt pavement construction is highly considered for plastic waste materials recycling due to its large daily production [1]. The HDPE plastic waste used was sourced from household bottle and plastic bag waste, which was shredded and added to the asphalt mixture at variations of 0%, 2%, 4%, 6%, and 8% by asphalt weight. The Marshall method was employed to evaluate stability, flow, Marshall Quotient, Voids in the Mixture (VIM), Voids Filled with Bitument (VFB), and Voids in Mineral Aggregate (VMA). The results indicate that the addition of 6% HDPE yields the most optimal Marshall characteristics, with a stability value of 1367.36 kg, a flow of 3.28 mm, and a Marshall Quotient of 417.09 kg/mm. All parameters at this level met the Bina Marga 2018 specifications. Therefore, the appropriate addition of HDPE waste can significantly improve asphalt mixture quality while contributing to environmental sustainability.
Penentuan Kurva Pertumbuhan Lactococcus lactis dan Evaluasi Potensi Supernatan Bebas Sel sebagai Agen Antibakteri terhadap Escherichia coli Krista, Gustin Mustika; Rinaldi, Kardian; Rahma, Andien Tiara; Maswanti, Azzahra Junisa
Jurnal Teknologi Vol 25, No 2 (2025): Agustus 2025
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/teknologi.v25i2.7504

Abstract

The increasing resistance of pathogenic bacteria to synthetic antibiotics has driven the search for safer and more sustainable natural antimicrobial agents. Lactic acid bacteria, particularly Lactococcus lactis, are known to produce bioactive compounds such as bacteriocins that can inhibit the growth of pathogenic microorganisms. This study aimed to evaluate the growth profile of L. lactis, its antibacterial activity against Escherichia coli, and to identify functional groups of active compounds using Fourier Transform Infrared (FTIR) spectroscopy. Antibacterial activity was assessed using the disk diffusion method on MHA plates inoculated with standardized E. coli suspensions. The growth curve analysis showed that L. lactis entered the lag phase between 0–9 hours, the logarithmic phase from 10–17 hours, and the stationary phase from 18–40 hours. The highest antibacterial activity was observed at 23 hours of incubation, with an inhibition zone diameter of 20 mm against E. coli. FTIR analysis of the cell-free supernatant revealed the presence of O–H, C–H, amide I, COO⁻, and C–O functional groups, suggesting the presence of bioactive compounds such as bacteriocins (e.g., nisin), lactic acid, and carbohydrate residues from the fermentation medium. These findings highlight the potential of L. lactis as a natural antimicrobial agent and support its further application in functional food development and biopharmaceutical formulations.
The Catalytic Performance of Vanadium–Nickel Supported on Zeolite for the Conversion of Crude Palm Oil into Short-Chain Hydrocarbons Rahmahwati, Cut Aja; Salmyah, Salmyah; Sami, Muhammad; Sariadi, Sariadi
Jurnal Teknologi Vol 25, No 2 (2025): Agustus 2025
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/teknologi.v25i2.7030

Abstract

The increasing global demand for fossil fuels, alongside declining domestic oil production, has intensified interest in renewable energy sources. Among Indonesia's abundant biomass options, crude palm oil (CPO) is a promising candidate for biofuel production due to its high triglyceride content and chemical similarity to petroleum. This study explores the catalytic cracking of CPO using a vanadium–nickel catalyst supported on natural zeolite, aiming to evaluate its physicochemical properties and catalytic performance in converting CPO into short-chain hydrocarbons for potential use as biogasoline. The catalyst was synthesized via wet impregnation of natural zeolite with ammonium metavanadate and nickel nitrate hexahydrate, followed by calcination. Characterization using Thermogravimetric Analysis (TGA), X-Ray Diffraction (XRD), and Scanning Electron Microscopy (SEM) confirmed good thermal stability, crystallinity, and surface morphology. Catalytic cracking was performed at elevated temperatures under atmospheric pressure. The liquid products were analyzed using Gas Chromatography-Mass Spectrometry (GC-MS). The results showed that the catalyst successfully facilitated the breakdown of triglycerides, producing mainly medium-chain fatty acids. Pentadecanoic acid (C₁₅H₃₀O₂) was identified as the dominant compound, indicating partial cracking of CPO. However, the product composition still contained oxygenated species, suggesting incomplete deoxygenation. Consequently, the resulting mixture does not yet meet biogasoline specifications. These findings highlight the potential of vanadium–nickel/zeolite catalysts in biofuel conversion processes, while also emphasizing the need for further catalyst optimization or additional processing stages to achieve complete transformation into fuel-grade hydrocarbons.

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