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All Journal IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) JURNAL PHOTON Acta Chimica Asiana Jurnal Pengabdian kepada Masyarakat Nusantara
Ramadhanti, Aulia Rizki
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemistry Computer Science & IT Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Environmental Science Nursing Physics Social Sciences

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The Fatal error: [File:D:/build/++Portal/Sync/Engine/Source/Runtime/Core/Private/Internationalization/ICUInternationalization.cpp] [Line: 153] ICU data directory was not discovered: ../../../Engine/Programs/CrashReportClient/Content/Internationalization ../. Siregar, Sri Hilma; Syahbella, Olif; Ramadhanti, Aulia Rizki
Acta Chimica Asiana Vol. 7 No. 1 (2024)
Publisher : The Indonesian Chemical Society, Chapter Nusa Tenggara and The University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/aca.v7i1.176

Abstract

This research aims to determine the quality of bricks mixed with different variations of sawdust and three types of testing and two characterizations have been carried out. The process of making bricks with the addition of wood dust is carried out by mixing montmorillonite and wood powder until homogeneous, with a mixture percentage of wood powder and bentonite of 0% (as a control), 10%, 20%, 30% and 50%, then dried and burned. Then the bricks are tested for three parameters, namely compressive strength test, acoustic test and water absorption test. Based on the test results, each test parameter obtained was a minimum compressive strength value of 43.75 kg/cm2 and a maximum of 82.57 kg/cm2, where variations 1 and 2 met the quality requirements (according to class III category according to SNI 15-2094- 2000). The acoustic test results obtained the best results in all variations in the second and third tests at Ls (night level) and the water absorption value was obtained at a minimum of 11.16% and a maximum of 60.98%, where variation 1 meets the quality requirements (according to SNI 15 standards –2094–2000).
Bentonite-chitosan bionanocomposite for adsorption of used lubricant oil: Bentonit-kitosan Siregar, Sri Hilma; Nurhaliza, Dwi; Ramadhanti, Aulia Rizki
Acta Chimica Asiana Vol. 8 No. 1 (2025)
Publisher : The Indonesian Chemical Society, Chapter Nusa Tenggara and The University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/aca.v8i1.220

Abstract

The growth of the transportation industry has led to the expansion of the automotive sector. Automotive business activities have the potential to cause several environmental problems, one of which is environmental pollution caused by used lubricating oil waste. One alternative effort to process lubricating oil waste is the adsorption method. This research aims to determine the ability or effectiveness of bentonite-chitosan composites in adsorbing waste lubricating oil. This research began by synthesizing Bentonite-Chitosan composites. The successfully synthesized material was then characterized using X-ray diffraction (XRD) and Fourier Transform Infra Red (FTIR) instruments. After that, it will be applied to used lubricating oil waste with variations in time and mass variations. The ability of the Bentonite-Chitosan composite to adsorb waste lubricating oil will be seen through the viscosity test results. The viscosity test results show a significant influence on the viscosity of the used lubricating oil. Meanwhile, the results of viscosity testing for mass variations show that the more bentonite-chitosan composite used, the greater the viscosity increase value. The highest viscosity value was obtained in the bentonite-chitosan composite of 15 g with a time of 5 hours at 7,75 cSt.
Pembuatan Nugget Dari Biji Nangka Upaya Mengoptimalkan Sumber Daya Masyarakat Desa Kualu Nenas Nasution, Hasmalina; Putri, Rahmayani Indah; Hidayati, Retno; Prasetya, Prasetya; Perdana, Fitra; Syafri, Rahmadini; Syahri, Jufrizal; Hilma, Rahmiwati; Siregar, srihilma; Ramadhanti, Aulia Rizki
Jurnal Pengabdian kepada Masyarakat Nusantara Vol. 4 No. 4 (2023): Jurnal Pengabdian kepada Masyarakat Nusantara (JPkMN)
Publisher : Lembaga Dongan Dosen

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

Abstract

Kualu Nenas Village is a village that produces quite a lot of jackfruit flesh in the form of chips for sale. UMKM that process jackfruit as the main ingredient will have an impact on the amount of easily damaged organic solid waste from the jackfruit itself, such as jackfruit seeds. However, in processing jackfruit seeds are more often just boiled or fried as a snack. One way to process jackfruit seed waste is to make nuggets. Socialization and nugget making training activities were carried out in Kualu Nenas Village with the PPK Ormawa HIMAKI team. The aim of this activity is to increase knowledge and skills for the people of Kualu Nenas Village in processing waste, optimizing natural resources, and improving the community's economy by selling jackfruit seed nuggets. The activity began with a presentation through socialization of material about waste jackfruit seeds and nuggets in general, then continued with practical training in making nuggets from waste jackfruit seeds. The results obtained from this community service activity are that the community can understand the techniques for processing jackfruit seed waste into nuggets well as shown by the achievement percentage ≤ 74%.
Synthesis of Manganese Oxide – Magnetite (Fe3O4) for The Degradation of Methylene Blue Ramadhanti, Aulia Rizki; Awaluddin, Amir; Nurhayati, Nurhayati; Siregar, Sri Hilma
Photon: Jurnal Sain dan Kesehatan Vol. 15 No. 2 (2025): Journal Photon
Publisher : LPPM Universitas Muhammadiyah Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37859/jp.v15i2.9019

Abstract

Methylene blue is a dye that is challenging to break down in aquatic environments. A promising approach to degrade methylene blue involves using metal oxide-based materials. Magnetite (Fe₃O₄) is beneficial for easy separation after catalytic reactions, while manganese oxide is effective in oxidation processes. Combining manganese oxide and magnetite can create materials with synergistic properties that improve the degradation of methylene blue through photocatalytic mechanisms or modified Fenton reactions. The development of manganese-magnetite oxide (Fe₃O₄) composites offers a potential solution for efficient, eco-friendly, and reusable catalysts. This study aims to investigate the synthesis of manganese-magnetite oxide and its performance in methylene blue degradation as an innovative solution to water pollution. The MnOx-Fe₃O₄ composite was successfully synthesized using the hydrothermal method at 110°C for 6 hours. XRD results show that increasing Fe₃O₄ concentration enhances the Fe₃O₄ peak, while the Hausmanite peak disappears, overlapping with the Fe₃O₄ peak, as supported by SEM results. The MnOx-Fe₃O₄ composite (1:10 ratio) was most effective in degrading methylene blue, achieving 92% degradation of 100 mL of 20 ppm methylene blue with a catalyst concentration of 0.1 g and 5 mL of H₂O₂ using the Fenton method.
Synthesis of Bentonite-TiO2 Bionanocomposite for Photodegradation of Used Lubricating Oil Siregar, Sri Hilma; Nasution, Hasmalina; Fitri, Rennadya Sekar; Ramadhanti, Aulia Rizki
IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Vol 10, No 2 (2025): June 2025
Publisher : IJFAC (Indonesian Journal of Fundamental and Applied Chemistry)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24845/ijfac.v10.i2.86

Abstract

Used lubricating oil waste contains heavy metal components which, if they enter the water, will block light. Used lubricants include toxic and hazardous waste (B3) so they need further processing before being reused or thrown away, because they are dangerous for human health and the environment. This research aims to determine the ability or effectiveness of the Bentonite-TiO2 composite in degrading used lubricating oil. The research began by synthesizing Bentonite-TiO2 where the composite results obtained were characterized. Based on the results of the FTIR spectrum analysis of Bentonite-TiO2, Ti was successfully modified in bentonite because the wave number 1419.84 cm-1 shows the presence of Al-O groups and the wave number 1423.92 cm-1 shows the presence of Ti-O-Ti vibrations. The results of XRD characterization show that TiO2 has formed in the bentonite-TiO2 composite, this makes the bentonite-TiO2 more stable and can be used as photocatalysis in the processing of used lubricating oil. The results of SEM-EDX analysis of Bentonite-TiO2 show the chemical composition of C, O, Al, Si, Ca, and Ti. In photodegradation, the mass variation viscosity value with an optimum time of 5 hours is the highest viscosity value, namely with a viscosity value of 5.11 cSt.
Co-Authors Amir Awaluddin Fitra Perdana Fitri, Rennadya Sekar Hasmalina Nasution Jasril Jasril Jufrizal Syahri Nurhaliza, Dwi Nurhayati Nurhayati Prasetya, Prasetya Putri, Rahmayani Indah Rahmadini Syafri Retno Hidayati Siregar, Sri Hilma Siregar, srihilma Syahbella, Olif