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Daud K. Walanda
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Jurnal Akademika Kimia
Published by Universitas Tadulako
ISSN : 24775185     EISSN : 23026030     DOI : -
Core Subject : Science, Education,
Chemistry Education
Jurnal Akademika Kimia is an electronic open-access journal that aims to publish the latest research results in the area of chemistry education and pure chemistry from academicians, professionals, and other practitioners at all levels of chemistry education. The journal coverage includes the following: current trends of professional chemistry education, educational technology, teacher education, educational science, learning assessment, learning models and development of learning materials, as well as pure chemistry including organic chemistry, inorganic chemistry, analytical chemistry, physical chemistry, biochemistry and other chemistry fields such as environmental chemistry, that emphasis on a broad description of the general methods and processes for the synthesis, modification, and characterization of chemical materials.
Arjuna Subject : Kimia(semua kategori) - Kimia (Lain-Lain)
Articles 3 Documents
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Search results for , issue "Vol. 15 No. 1 (2026)" : 3 Documents clear
Utilisation of Biochar from Kapok Randu (Ceiba pentandra) Branches for Decolourisation of Remazol Red in Water Dasi, Alfina D. A.; Napitupulu, Mery; Walanda, Daud K.; Rahmawati, Sitti
Jurnal Akademika Kimia Vol. 15 No. 1 (2026)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2026.v15.i1.pp1-8

Abstract

Synthetic dyes such as remazol red are commonly used in the batik process, but their residual waste is a major contributor to water pollution. These effluents can degrade water quality, damage aquatic ecosystems, and pose health risks to humans. This research aims to reduce these problems by using an adsorption method that utilises kapok randu branch as an adsorbent for remazol red dye. Kapok randu branches were pyrolysed at temperatures of 400 °C, 450 °C, and 500 °C. This study aims to measure the ability of biochar from kapok randu branches to adsorb remazol red dye under varying weight, time, and pH conditions. The results showed the characteristics of kapok randu branches biochar include moisture content of 400 °C, 450 °C and 500 °C biochar of kapok randu branches of 5.56 %, 5.01 % and 4.80 %, respectively. The ash content of the 400 °C, 450 °C, and 500 °C kapok randu branch biochar was 5.68 %, 6.66 %, and 7.24 %, respectively. The maximum weight of kapok randu branch biochar in adsorbing remazol red dye is 25 mg with an adsorption capacity of 0.312 mg/g. The maximum contact time required was 60 minutes with an adsorption capacity of 1.004 mg/g. The maximum pH for the remazol red dye during the adsorption process was at pH 4, with an adsorption capacity of 5.816 mg/g.
Analysis of Primary Metabolites Content in Ketapang Seed Tempe (Terminalia Catappa) Wulandari, Siska D.; Nuryanti, Siti; Tahril, Tahril; Aminah, Sitti
Jurnal Akademika Kimia Vol. 15 No. 1 (2026)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2026.v15.i1.pp9-16

Abstract

Ketapang seed tempeh (Terminalia catappa) is made from ketapang seed waste through a fermentation process using Rhizopus sp., as with soybean tempeh. This study used a quantitative descriptive method to determine the content of primary metabolites, including fat, protein, and carbohydrates. Laboratory analysis was conducted at the Chemistry Education Laboratory, Tadulako University, using the Soxhlet method for fat, the Kjeldahl method for protein, and the phenol-sulfur method for carbohydrates, as well as organoleptic tests by 15 panellists. The results showed that ketapang seed tempeh had very low fat content (0.1714%), low protein (0.0189 g per 100 g sample), and moderate carbohydrate (10.06%). Fried ketapang tempeh was preferred by the panellists, although its acceptance level was still lower than that of soybean tempeh. The novelty of this study lies in the quantitative evaluation of primary metabolites in tempeh made entirely from ketapang seeds, which has not been previously reported. These findings indicate that ketapang seeds have the potential to serve as an alternative ingredient in the production of low-fat tempeh.
Impact of Ferric Chloride–Induced Oxidation on the Physicochemical Characteristics of Chicken Fat and Its Biodiesel Maanari, Chaleb P.; Gugule, Sanusi; Fatimah, Feti; Rumengan, Stefan M.; Utami, Aisyiah R. P.; Mustapa, Mustapa; Sidabukke, Indah U. Br.
Jurnal Akademika Kimia Vol. 15 No. 1 (2026)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2026.v15.i1.pp17-24

Abstract

Background/problems: Biodiesel from animal fats is vulnerable to metal-catalyzed oxidation that degrades fuel quality because of the unsaturated fatty acid content. This study investigates the oxidative stability and physicochemical changes of chicken fat and its biodiesel upon FeCl₃-catalyzed oxidation. Methods: Chicken fat was transesterified to produce biodiesel; chicken fat (CF) and chicken-fat biodiesel (CF-BD) were then subjected to an FeCl₃ oxidative condition. Acid value (AV), iodine value (IV), peroxide value (PV), kinematic viscosity at 40 °C, and density were determined using standard titrimetric and physical methods; FTIR assessed spectral changes. ANOVA compared group means. Findings: Oxidation significantly increased AV and PV for both matrices, with a marked PV rise in CF-BD (6.17 ± 0.29 to 88.17 ± 5.35 meq/kg), and decreased IV (CF-BD 84.3 ± 4.51 to 48.7 ± 4.32 g I₂/100 g). Viscosity and density increased modestly. Visually, CF-BD shifted from clear yellow-green to brown and turbid with sediment, consistent with polymer formation and methyl-ester degradation. FTIR showed attenuation/shift of ester carbonyl and aliphatic bands. Conclusion: FeCl₃-induced oxidation measurably deteriorates CF-BD quality, breaching key limits in ASTM/SNI for acid value and viscosity. Impact: Results underscore the need to control trace metals and apply antioxidant/metal-deactivator strategies in storage and distribution, and validate the FeCl₃ assay as a practical accelerated-degradation model for stability and additive screening.

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