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Asriyani, Nur
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Control & Systems Engineering Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Physics

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Identification of Functional Groups of Rapitest Luster Leaf Products for Soil Phosphorus Testing Based on Color Changes using Fourier Transform Infrared Spectroscopy (FTIR) Asriyani, Nur; Rahmawati, Hilda
Journal of Energy, Material, and Instrumentation Technology Vol 5 No 3 (2024): Journal of Energy, Material, and Instrumentation Technology
Publisher : Departement of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jemit.v5i3.277

Abstract

Phosphorus is an important nutrient for plants and is useful as the main driver of primary productivity in plants. Periodic soil phosphorus testing is essential to monitor the availability of phosphorus in the soil so that it is not excessive or reduced to achieve maximum productivity. Testing using laboratory methods takes a long time and is expensive. Rapitest Luster Leaf is a soil testing product based on color changes using a colorimetric method of mixing reagents and color indicators that is practical, easy, portable, and can be used directly on agricultural land. Identification of Rapitest functional groups using FTIR is carried out to predict compound content as a renewable material for soil testing. The analysis showed that the functional groups formed include SO42, which occurs at 987, 631, and 602 cm-1 vibration waves. It indicates that the vibration is shifting to the right. At vibrations of 677-573 cm-1, the absorption of the Na2SO4 compound occurs. Sodium sulfate is predicted to be a reagent compound contained in Rapitest. At 811-901 cm-1 and 3524-3209 cm-1 vibration waves, functional group bonds of Mo-O and N-H are formed, respectively. The molecular bonds formed predict that ammonium molybdate is the color indicator compound used.
Synthesis and Characterization of Activated Carbon from Pattikala Fruit Waste (Etlingera elatior) Rahmawati, Hilda; Ismail, Nurmalasari; Asriyani, Nur; Jufri, Risma
Journal of Energy, Material, and Instrumentation Technology Vol 5 No 4 (2024): Journal of Energy, Material, and Instrumentation Technology
Publisher : Departement of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jemit.v5i4.280

Abstract

Activated carbon (AC) is an amorphous material with a suitable size pores distribution, high specific surface area, and high surface reactivity. Activated carbon can be produced from biomaterials and can be used as a water filter material, an absorbent for hazardous substances, and as electrodes in supercapacitors. Etlingera elatior or Pattikala fruit waste has lignocellulose content that can potentially be activated carbon material. This study aimed to synthesize Etlingera elatior or Pattikala fruit waste by chemical activation method into activated carbon. Based on the study's results, activated carbon from Pattikala fruit waste has a high purity level of 87.80%, and SEM results show that pores have begun to form in the activated carbon samples produced. This study demonstrates that activated carbon can be produced from Etlingera elatior fruit waste.
Analysis of Aluminium Alloy 6061 Material Coating with the Addition of Malonic Acid Additive in the Plasma Electrolytic Oxidation Method to Improve Corrosion Resistance Properties Lubis, Muhammad Ihsan; Mutmainnah; Kamil, Muhammad Prisla; Suwondo, Kusuma Putri; Asriyani, Nur; Lantang, Jessica Valenthine
Journal of Energy, Material, and Instrumentation Technology Vol 6 No 3 (2025): Journal of Energy, Material, and Instrumentation Technology
Publisher : Departement of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jemit.335

Abstract

Aluminum alloy 6061 is extensively used in structural and engineering applications due to its favorable strength-to-weight ratio, good mechanical properties, and inherent corrosion resistance. However, it remains vulnerable to localized corrosion, especially in chloride-rich environments. This study investigates the effect of malonic acid (MA) as an organic additive in the Plasma Electrolytic Oxidation (PEO) process to enhance the corrosion resistance of aluminum alloy 6061. The experimental results indicate that the presence of MA reduces plasma initiation time, stabilizes discharge behavior, and facilitates the formation of a denser and more uniform oxide layer. Surface morphology analysis reveals that PEO coatings with MA exhibit finer porosity and a thicker structure, contributing to improved barrier properties. XRD characterization confirms the presence of stable crystalline phases such as mullite and andalusite in the MA-enhanced coatings. Electrochemical testing via Tafel polarization shows a significant reduction in corrosion current density (3.899 x 10-7 A/cm2) and corrosion rate (0.642 mm/year), alongside a more positive corrosion potential (-2.616 V) in the MA-treated samples. When compared to traditional corrosion inhibitors, both organic (for example, imidazole-based compounds) and inorganic (for example, CaCO3 and SiO2), the PEO plus MA method demonstrates superior long-term corrosion resistance and structural stability. These findings highlight the potential of malonic acid as an effective additive for optimizing the PEO process in demanding environmental conditions.
Co-Authors Hilda Rahmawati Ismail, Nurmalasari Jufri, Risma Kamil, Muhammad Prisla Lantang, Jessica Valenthine Lubis, Muhammad Ihsan Mutmainnah Suwondo, Kusuma Putri