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All Journal International Journal of Acta Material
S. Kasim
Department of Chemistry, Faculty of Mathematics and Natural Sciences, Hasanuddin University, Jalan. Perintis Kemerdekaan No.KM.10, Makassar,South Sulawesi, 90245, Indonesia
Chemistry Materials Science & Nanotechnology Physics

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Extraction of Tannin Compounds from Samanea saman (Jacq.) Merr Leaves and Their Application as Corrosion Inhibitor in ST 37 Steel S. Kasim; S. Fauziah; R. Ananda; I. W. Sutapa; A. Kamari
International Journal of Acta Material Vol. 1 No. 1 (2024): August 2024
Publisher : Faculty Mathematics and Natural Sciences, Halu Oleo University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62749/ijactmat.v1i1.3

Abstract

Research has been conducted on extracting tannin compounds from Samanea saman (Jacq) Merr leaves and their potential application as corrosion inhibitors for ST 37 steel. The purpose of this study was to evaluate the impact of adding Samanea saman (Jacq) Merr leaf extract on the corrosion rate and inhibition efficiency of ST 37 steel when exposed to 25% acetic acid. The immersion process was carried out with different concentrations: 0%, 5%, 10%, 20%, and 30%, and with immersion time intervals of 2, 4, 6, and 8 days. The concentration and optimum immersion time results were then further tested at temperatures of 20ºC, 30ºC, and 40ºC. The test results indicate that corrosion occurs uniformly on the surface of the steel. The corrosion rate was determined using the weight loss method, and it was observed that the weight reduction of the steel without inhibitor was higher compared to that of the steel treated with Samanea saman (Jacq) Merr leaf extract inhibitor. Based on the study findings, the highest inhibition efficiency was achieved with a concentration of 20% and an immersion time of 6 days, resulting in an efficiency of 87.3464% and a corrosion rate of 1.9143 mpy. Regarding temperature variations, the highest inhibition efficiency was observed at 20ºC, with an efficiency of 66.6908% and a corrosion rate of 2.8435 mpy.
Analysis of Water Quality in Sea Waters After The Sea Snot Occurrence in Bima Bay West Nusa Tenggara S. Kasim; N. A. Pratiwi; H. Natsir; S. Liong; I W. Sutapa
International Journal of Acta Material Vol. 1 No. 2 (2025): February 2025
Publisher : Faculty Mathematics and Natural Sciences, Halu Oleo University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62749/ijactmat.v1i2.12

Abstract

The incident that occurred in April 2022 in Bima Bay was a phenomenon that shocked the residents of Bima City and outside the Bima area. Based on previous laboratory tests, the cause is Sea Snot which is accompanied by an explosion in the number and metabolism of algae. The entry of organic and inorganic pollutants into water bodies can cause water quality to experience degradation in biological function. This research aims to analyze water quality in marine waters with the parameters BOD, COD, DO, determine the Nitrate and Phosphate content and characterize total coliform and E. coli bacteria in marine waters. This research uses electrometric, photometric and membrane filtrate methods. pH ranged from 7.85 - 8.22; DO levels 5.97 - 6.15 mg / L, BOD 1.3, and 5 ranged from 5.52 - 9.06 mg / L. COD levels 15.62 - 21.44 mg / L. Nitrate ranges from 0.124 - 0.204 mg/L. Phosphate ranges from 0.27 - 0.41. Total coliform bacteria ranges from 706 - 1,266 colonies/100 mL and E. coli 0.75 - 1.75 colonies/100 mL. The water quality in the sea waters of Bima Bay has mostly met the sea water quality standards for the parameters BOD, DO, total coliform, E. coli , while the COD parameter is not included in the mandatory parameters which are one of the indicators of sea water pollution. The content of Nitrate and Phosphate in the waters of Bima Bay shows that its value has exceeded the sea water quality standards.
The Latest Green Synthesis of Silver Nanoparticles Using Cocoa Fruit Peel Extract (Theobroma cacao L.) as a Bioreductant S. Kasim; W. Riskiyani; A.N. Zahra; I W. Sutapa; A. Kamari; C. Baskar
International Journal of Acta Material Vol. 2 No. 1 (2025): August 2025
Publisher : Faculty Mathematics and Natural Sciences, Halu Oleo University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62749/ijactmat.v2i1.17

Abstract

Cocoa fruit peel contains a variety of phytochemicals, including tannins, flavonoids, alkaloids, terpenoids, and saponins, which are anticipated to act as reducing agents. The green synthesis method employs methanol as a solvent to extract organic compounds from cocoa fruit peel, which serve as bio-reductants. This study aims to synthesize silver nanoparticles utilizing cocoa fruit peel extract as a bio-reductant. It involved the preparation of silver nitrate (AgNO₃) solutions at varying concentrations of 0.5 mM, 1 mM, and 1.5 mM. Characterization of the nanoparticles was conducted using a UV-Vis spectrophotometer and a Particle Size Analyzer (PSA). The study observed the formation of silver nanoparticle colloids after 30 minutes of stirring, as evidenced by a color change in the colloid to brown. UV-Vis spectrophotometer analysis revealed a maximum wavelength of 461 nm with an absorbance value of 2.032. Notably, as the concentration of silver nitrate (AgNO₃) increased, the absorbance value correspondingly increased. The PSA results indicated that the silver nanoparticles had an average size of 96.08 nm.
Potential of Water Hyacinth (Eichornia crassipes) Activated Carbon as Adsorbent for Heavy Metal Pb in Wastewater of Hapsah Hospital Bone Regency S. Kasim; I. Zahrawani
International Journal of Acta Material Vol. 2 No. 2 (2026): February 2026
Publisher : Faculty Mathematics and Natural Sciences, Halu Oleo University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62749/ijactmat.v2i2.32

Abstract

The water hyacinth plant is one of the plants that has potential as a bio-adsorbent. Water hyacinth has the ability to absorb heavy metals such as Pb because it has a high cellulose content of 60%, hemicellulose 8%, and lignin 17%, and has been proven effective in dealing with environmental pollution. This study aims to analyze the potential of water hyacinth as an adsorbent of lead metal ions (Pb), determine the initial and final concentration of wastewater that has been adsorbed using water hyacinth adsorbent of lead metal ions (Pb) in the wastewater of Rumah Sakit Hapsah Bone Regency, and characterize water hyacinth activated carbon before and after adsorption. The process of making water hyacinth activated carbon, characterization of water hyacinth activated carbon, analysis of lead metal (Pb) levels in wastewater using SSA, and application of water hyacinth activated carbon to wastewater. The results showed that the initial level of lead metal ions (Pb) in the wastewater of Hapsah Hospital, Bone Regency was 0.68 mg/L, and water hyacinth activated carbon showed optimal adsorption ability at a contact time of 20 minutes and mass of 2 grams. Based on the results of the research that has been done, it can be concluded that the activated carbon produced from water hyacinth has the best quality.
Co-Authors A. Kamari A.N. Zahra C. Baskar H. Natsir I W. Sutapa I W. Sutapa I. W. Sutapa I. Zahrawani N. A. Pratiwi R. Ananda S. Fauziah S. Liong W. Riskiyani