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Mulmeyda, Rinda
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Biochemistry, Genetics & Molecular Biology Chemistry Materials Science & Nanotechnology

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Utilization of Used Cooking Oil in Making Liquid Soap with the Addition of Water Hyacinth (Eichhornia crassipes) Leaf Extract as an Antibacterial Nababan, Bella Pricilya; Mulmeyda, Rinda; Insyani, Navisya Putri
Chemistry and Materials Vol. 3 No. 2 (2024)
Publisher : Pusat Inovasi Sains

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56425/cma.v3i2.76

Abstract

The frequent disposal of used cooking oil into waterways, along with the proliferation of water hyacinth plants that become invasive in water bodies, contributes to environmental pollution and compromises ecosystem health. One of the effective solutions against various diseases is thorough handwashing with antibacterial soap to eliminate germs and dirt. Therefore, this study aims to investigate the impact of water hyacinth leaf extract addition on the antibacterial activity of cooking oil-based liquid soap. The research employs an experimental approach. Results from pH testing indicate that all liquid soap formulations produced meet the criteria for high-quality liquid soap. Among the variations tested, the formula containing 5% water hyacinth extract exhibited the best foam stability. Regarding antibacterial efficiency, the results suggest that all three samples exhibited weak inhibition of bacterial growth. However, the formula with 10% water hyacinth concentration showed the highest average inhibition zone of 3.46 mm.
Utilization of Plantain Peel (Musa sapientum) and Sweet Potato Starch (Ipomea batatas) Waste in Combination with Glycerol Addition to Produce Biodegradable Plastic Shafa Maura, Chika; Athariq, Muhamad; Mulmeyda, Rinda
Chemistry and Materials Vol. 3 No. 2 (2024)
Publisher : Pusat Inovasi Sains

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56425/cma.v3i2.77

Abstract

Starch is a natural polymer derived from plants, known for its biodegradability, environmental friendliness, wide availability, and affordability. Glycerol, with its low molecular weight, serves as an effective plasticizer. Its addition enhances the physical and mechanical properties of plastics and provides protection against microbial degradation. This study aims to investigate the impact of glycerol addition on the mechanical properties of biodegradable plastics made from sweet potato starch and plantain peel waste. The research is an experimental to achieve this goal. The results indicated that all samples achieved 100% degradation, with elongation percentages ranging from 93.59% to 137.56%. The sample containing 10 grams of sweet potato starch and 5 grams of banana peel starch exhibited the lowest water absorption percentage at 73.43%. Additionally, the bioplastic sample consisting of 5 grams each of sweet potato starch and banana peel starch showed the highest thickness at 0.36 mm, meeting the established SNI standards. In conclusion, the mechanical properties, biodegradability, and transparency of bioplastics are influenced by variations in sweet potato starch and plantain peel starch composition, as well as by the addition of glycerol.
The Effect of Saccharin on SnNi Alloy: the Electrodeposition and its Electrocatalytic Activity in Ethanol Oxidation Reaction Mulmeyda, Rinda; Abdul Ghofur Sidik; Chika Shafa Maura; Abdul Asywalul Fazri
Chemistry and Materials Vol. 3 No. 3 (2024)
Publisher : Pusat Inovasi Sains

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56425/cma.v3i3.85

Abstract

The development of Direct Ethanol Fuel Cell (DEFC) has attracted much attention, as alternative energy sources due to its various advantages. However, among its various advantages, DEFC has several problems, such as the kinetics of the ethanol oxidation reaction. Transition metal-based catalysts such as nickel and tin are considered as potential catalysts for DEFC due to their oxophilic properties that can improve catalytic activity. In this study, the effect of saccharin on SnNi bimetallic alloy catalyst synthesized by electrodeposition method on copper wire substrate was investigated. SnNi samples were characterized by several techniques, including X-ray diffraction, Scanning electron microscopy, and energi dispersive X-ray spectrocopy. Saccharin addition had a significant effect on the morphology, crystallite size, and composition of the catalyst. The presence of saccharin causes the formation of more uniform particles and has a smaller size. The sample with the addition of saccharin had a smaller charge transfer resistance value 4.82 Ω, lower tafel slope by 115 mV/dec, and show higher jf/jb ratio by 0.55.  Furthermore, as the current density decreases, the SnNi catalyst with saccharin has a slow decrease rate and higher stability than the SnNi catalyst without saccharin.
Synthesis of α-Fe2O3 and α-Fe2O3/SiO2 Composite from Geothermal Waste by Sol-Gel Method and Their Characterization Mulmeyda, Rinda; Reinardo Ramawijaya Widakusuma; Sabrina Putri Chaerani; Agus Purwanto; Rifqi Almusawi Rafsanjani; Habib Muhammad Zapar; Bagaskoro Pranata Ardhi
Chemistry and Materials Vol. 4 No. 1 (2025)
Publisher : Pusat Inovasi Sains

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56425/cma.v4i1.91

Abstract

Iron oxide materials, especially hematite (α-Fe2O3), have many important applications. Improving the characteristics and physical properties of hematite has been widely developed, one of which is to combine it as a composite structure with porous materials such as silica (SiO2) as α-Fe2O3/SiO2 composite. This research aims to synthesize α-Fe2O3 particles and α-Fe2O3/SiO2 composites. The α-Fe2O3/SiO2 composite was successfully synthesized by using geothermal waste as an alternative source of silica prepared by the sol-gel method. Both synthesized samples were characterized by X-ray diffraction, scanning electron microscopy equipped with energy dispersive spectroscopy, and X-ray fluorescence techniques. The results showed that silica composites on hematite structure slightly affect the morphology, color, or particle size compared to α-Fe2O3.
Co-Authors Abdul Asywalul Fazri Abdul Ghofur Sidik Agus Purwanto Athariq, Muhamad Bagaskoro Pranata Ardhi Chika Shafa Maura Habib Muhammad Zapar Insyani, Navisya Putri Nababan, Bella Pricilya Reinardo Ramawijaya Widakusuma Rifqi Almusawi Rafsanjani Sabrina Putri Chaerani Shafa Maura, Chika