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All Journal Abdimas Talenta : Jurnal Pengabdian Kepada Masyarakat Indonesian Physical Review JOURNAL OF CHEMICAL NATURAL RESOURCES (JCNaR) Jurnal Rekayasa Proses
Daulay, Amru
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Physics Social Sciences

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Dual-synergistic effects of citric acid on atmospheric leaching of manganese ores Widi Astuti; Rofiek Mufakhir, Fika; Iman Supriyatna, Yayat; Daulay, Amru; Setyadji, Moch.; Sofiana Dewi, Jilda
Jurnal Rekayasa Proses Vol 19 No 2 (2025): Volume 19, Number 2, 2025
Publisher : Jurnal Rekayasa Proses

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jrekpros.17590

Abstract

In the current study, a leaching of manganese from Indonesian manganese ores using citric acid as leaching reagent without the addition of reducing agent was investigated. Citric acid was being used as a leaching reagent and reducing agent at same time due to its reducing power. Several leaching parameters were investigated to obtain the optimum condition of citric acid leaching of manganese from those manganese ores. Low grade manganese ores from two mining areas in Indonesia contained 36.77% Mn (WK ore) and 12.5% (TG ore) with different mineral types can be leached using citric acid as leaching reagent without addition of reducing agent. The optimum manganese recovery was obtained at around 76% and 69% respectively for WK ore and TG ore with citric acid of 1M, 5% of pulp density, 150 rpm of shaker speed, 30oC of leaching temperature, 1 hour of leaching period, and <75 µm of ore particle size. This condition was also selective for iron recovery leaching. This experiment proves that citric acid has a dual-synergistic effect as an effective leaching reagent and reducing agent at the same time for manganese leaching from manganese ores.
ECO FRIENDLY CITRIC ACID-ASSISTED SOL-GEL SYNTHESIS OF HIGH-PURITY NANO SILICA FROM DIENG GEOTHERMAL SLAG: CHARACTERIZATION AND OPTIMIZATION METHOD Birawidha, David C; Manaf, Azwar; Astuti, Widi; Daulay, Amru; Haryono, Tri; Sari, Yuliana; Suprihatin, Suprihatin
Indonesian Physical Review Vol. 8 No. 2 (2025)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v8i2.486

Abstract

Geothermal slag is a by-product of the geothermal power generation process, but its added value is minimal. With a silica content of up to 70%, geothermal slag has potential as a secondary silicon source for battery silicon anode precursors. Usually, the synthesis of nano-silica was carried out through the sol-gel method, in which HCl is usually used as a modifier to regulate the physical and chemical properties of the material. But in this study chose citric acid for modifier agent because it is more environmentally friendly. The challenge of using citric acid is the formation of carbon-based salts that can cause silica blackening if not washed well. Therefore, optimization was done by adjusting the pH to produce high-purity nano-silica. The sol-gel process was carried out by adding 10% NaOH and 5N Citric Acid, with varying pH base conditions from 8 to 11. XRF analysis results showed the highest purity at pH 8. Impurities were still visible based on XRD data, and the formation of nanoparticles was confirmed through morphological analysis using FESEM and TEM where the average particle size formed is between 55 nm.
Training in the Manufacture of Softener Fragrance Aroma Therapy in Tembung Village, District Percut Sei Tuan Marpongahtun; Andriayani; Pratama, Agung; br Sembiring, Helmina; Prayugo, Aniza Salviana; Daulay, Amru
ABDIMAS TALENTA: Jurnal Pengabdian Kepada Masyarakat Vol. 8 No. 1 (2023): ABDIMAS TALENTA: Jurnal Pengabdian Kepada Masyarakat
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/abdimastalenta.v8i1.10326

Abstract

Tembung Village, Percut Sei Tuan District, Deli Serdang Regency, North Sumatra Province, is a densely populated area. There are more than 200 laundry businesses. The potential for laundry business actors to produce softener and aromatherapy fabric softener has been hit very hard. However, the villagers, especially laundry business actors, do not know how to make these products. Making aromatherapy softeners independent will provide added value to the laundry business actors and villagers regarding economic costs and the transfer of knowledge of technology (science and technology commercialization). Therefore, the University of North Sumatra community service team wants to commercialize science and technology in making aroma softening therapy. The method used in this activity is the selection of partner locations, training, monitoring, and evaluation. The results of the questionnaire gave a value of 95% Participants were interested in training to produce aromatherapy softeners independently and took the initiative to make the results of this training a new opportunity.
Synthesis and Characterization of Amorphous Silica Nanoparticles Production from Indonesia Coal Fly Ash Chambioso, Yugo; Juwono, Ariadne Lakshmidevi; Daulay, Amru
Journal of Chemical Natural Resources Vol. 7 No. 2 (2025): Journal of Chemical Natural Resources (JCNaR)
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jcnar.v7i2.23383

Abstract

Coal fly ash an inexpensive waste material rich in silica, is reused as a renewable source and has attracted widespread attention. The sol-gel process was used to synthesize silica nanoparticles based on coal fly ash. Extraction of silica in the form of alkaline sodium silicate using alkali, followed by the formation of silica gel from the neutralization of alkaline sodium silicate with acid. The treated samples were calcined at 450 °C, 650 °C, and 850 °C. The chemical composition, morphology, phase, and silica functional groups of the as-synthesized silica nanoparticle powder were investigated using X-ray fluorescence (XRF), field emission scanning electron microscopy and Electron diffraction spectroscopy (FESEM-EDS), Fourier transform infrared spectroscopy (FTIR), and X-ray diffraction (XRD). Infrared (IR) spectral analysis showed that silica had hydrogen-bonded silanol and siloxane groups. The silica nanoparticles' purity was found to be as high as 97% in their amorphous state, with XRD analysis indicating this due to the broad peak observed in the 20-23° two-theta region, characterised by a spherical shape and a tendency to aggregate into clusters.
Co-Authors Agung Pratama Andriayani Azwar Manaf Birawidha, David C Chambioso, Yugo Iman Supriyatna, Yayat Juwono, Ariadne Lakshmidevi Marpongahtun Moch. Setyadji Prayugo, Aniza Salviana Rofiek Mufakhir, Fika Sembiring, Helmina Br. Sofiana Dewi, Jilda Suprihatin Suprihatin Tri Haryono Widi Astuti Yuliana Sari