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All Journal Fullerene Journal of Chemistry Jurnal Abdimas Madani dan Lestari (JAMALI) Makara Journal of Science
Arfan, Aulia Rhamdani
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Agriculture, Biological Sciences & Forestry Humanities Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Other

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Synthesis, Molecular Characteristics, and Antibacterial Assessment of Marine Hydroid Aqueous Extract-Based Silver Bio-nanoparticles Mandey, Fredryk; Arfan, Aulia Rhamdani; Arfah, Rugaiyah Andi
Makara Journal of Science Vol. 28, No. 1
Publisher : UI Scholars Hub

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Abstract

This investigation aims to synthesize, analyze the molecularity, and test the ability of bacterial inhibition capability of silver nanoparticles that have been synthesized by simply mixing silver nitrate and aqueous extracts of marine natural products with and without the addition of amylum as a stabilizing agent. This research, with and without the addition of amylum as a stabilizing agent, obtained 39.0 and 55.2 mg of solids of round-shaped morphology silver nanoparticles with diameters of 87.9 and 103.0 nm., respectively. In addition, the antibacterial testing assay against Staphylococcus aureus and Escherichia coli showed some considerably good results. S. aureus with the addition of amylum had inhibition zone diameters of 8.55 and 7.45 mm, whereas without the addition of amylum had inhibition zone diameters of 7.82 and 7.22 mm. E. coli with the addition of amylum had inhibition zone diameters of 7.0 and 7.65 mm, whereas E. coli without the addition of amylum had inhibition zone diameters of 7.82 and 7.22 mm.
Potential of Moringa oleifera Seeds as a Natural Coagulant for Turbidity and LAS Removal from Detergent Wastewater Arfan, Aulia Rhamdani; Irawati, Utami; Indah, Rahma; Hikmah, Nawwal
Jurnal Kimia Fullerene Vol 10 No 2 (2025): Fullerene Journal Of Chemistry
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37033/fjc.v10i2.748

Abstract

Detergent wastewater contains high levels of surfactants, particularly Linear Alkylbenzene Sulfonate (LAS), which are persistent and harmful to aquatic ecosystems. This study evaluated the potential of Moringa oleifera seed extract (MOS) as a natural coagulant for detergent wastewater, compared with alum as a synthetic coagulant. The coagulation process was carried out using the jar test method at varying dosages (100–1500 mg/L) and pH levels (4–9). Turbidity was measured following SNI 06-6989.25-2005, while LAS concentration was analysed using the Methylene Blue Active Substances (MBAS) method. Results showed that MOS achieved optimum performance at 1500 mg/L and pH 4, with a turbidity removal efficiency of 94.96% (final turbidity 4.76 NTU) and LAS removal efficiency of 88.94% (final concentration 0.58 mg/L). In comparison, alum reached its optimum at 200 mg/L and pH 6, with lower LAS removal efficiency. Validation with wastewater samples stored for 1–3 nights indicated that MOS maintained consistent performance, while alum showed fluctuating results. An in-silico docking study further confirmed the molecular interaction between LAS and MOS proteins, with a binding energy of –4.8 kcal/mol, supporting the observed experimental results. These findings demonstrate that MOS is a promising, low-cost, and environmentally friendly alternative to alum for detergent wastewater treatment.
Mnemonic and Visual Approaches to Improve Students’ Understanding of the Periodic System of Elements at SMAN 2 Banjarbaru : Indonesia Arfan, Aulia Rhamdani; Wardani, Dyah Ayu Pramoda; Irawati, Utami; Santoso, Uripto Trisno; Sunardi; Rohman, Taufiqur
Jurnal Abdimas Madani dan Lestari (JAMALI) Volume 08, Issue 2, September 2026
Publisher : UII

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/jamali.vol8.iss2.art17

Abstract

Chemistry is often considered difficult by high school students because many of its concepts are abstract, technical, and require the retention of factual information. One fundamental topic that students need to master is the periodic table, as it supports their understanding of element symbols, element groups, periodic trends, and other chemistry concepts. This community service activity aimed to improve students’ understanding of the periodic table through mnemonic and visualization approaches. The activity was conducted at SMAN 2 Banjarbaru and involved 36 students from class X-6. The program consisted of interactive training on the Periodic System of Elements, a Chemical Elements BINGO game, and a short socialization session about the Chemistry Department. Students’ learning outcomes were evaluated using pre- and post-tests, while their responses to the activity were collected through a questionnaire. The average percentage of correct answers increased from 82.22% in the pre-test to 93.33% in the post-test, with an overall normalized gain (g) of 0.625, which falls within the medium category. A paired-samples t-test showed that the increase was statistically significant, t(35) = 2.76, p = 0.009, with a moderate effect size (Cohen’s dz = 0.46). Students also reported positive responses to the mnemonic method, visual learning media, and interactive learning process. These findings indicate that mnemonic and visualization approaches have the potential to support more engaging and interactive learning of the periodic table.
Co-Authors Arfah, Rugaiyah Andi Fredryk Welliam Mandey Hikmah, Nawwal Indah, Rahma Sunardi Taufiqur Rohman Uripto Trisno Santoso Utami Irawati Wardani, Dyah Ayu Pramoda