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All Journal Indonesian Journal of Chemistry Makara Journal of Science
Arfah, Rugaiyah Andi
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Chemical Engineering, Chemistry & Bioengineering Chemistry

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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.
The Utilization of Gracilaria sp. as Raw Material for Cellulose in Cellulose Acetate-Nickel Oxide (CA-NiO) as Electrode for Energy Storage Technology Karim, Abdul; Ahmad, Ahyar; Arfah, Rugaiyah Andi; Ermawar, Riksfardini Annisa; Karim, Harningsih; Putra, Andi Erwin Eka; Putri, Suriati Eka; Negara, Satria Putra Jaya; Larekeng, Siti Halimah
Indonesian Journal of Chemistry Vol 25, No 1 (2025)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.96533

Abstract

In the modern era, electrical energy has become a significant need that drives the large consumption of fossil fuels and their environmental impacts. Supercapacitors can reduce this large consumption of natural polymers such as cellulose acetate (CA), which can be synthesized from Gracilaria sp. Composites with CA can be an environmentally friendly alternative electrode with low toxicity. The results show that the cellulose has been successfully synthesized from the algae Gracilaria sp., which was proven by FTIR spectra analysis. The results also show that supercapacitor electrodes have been successfully made where the manufactured electrodes form a composite between CA and nickel oxide (NiO), with the highest specific capacitance and specific energy values of 15.5 × 102 F/g and 13.3 × 102 Wh/kg, respectively, on the CA-NiO2 electrode, but when the NiO concentration is higher than the CA concentration the specific capacitance and specific energy decrease as shown on the CA-NiO electrode with NiO mass of 0.6 g. Thus, the materials results of this study can be applied to electric vehicles and technology that requires electricity storage in the future.
Co-Authors Abdul Karim Ahyar Ahmad Andi Erwin Eka Putra Arfan, Aulia Rhamdani Fredryk Welliam Mandey Harningsih Karim Negara, Satria Putra Jaya Riksfardini Annisa ERMAWAR SITI HALIMAH LAREKENG, SITI HALIMAH Suriati Eka Putri