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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 237 Documents
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Influence Problem-Based Learning Model (PBL) on Student Learning Outcomes on Colloidal Systems Material Nurjanna Nurjanna; Sri M. Sabang; Ijirana Ijirana; Ratman Ratman
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.pp46-54

Abstract

Students' chemistry learning outcomes remain relatively low, especially in the colloidal system material, which is considered difficult to understand due to a lack of active student involvement in the learning process. The Problem-Based Learning (PBL) model is an innovative approach that can improve student learning outcomes by presenting real problems that encourage students to think critically, analytically, and actively in finding solutions. This study aims to examine the effect of the PBL model on student learning outcomes in the colloidal system material for class XI at SMA Negeri 1 Palu. The type of research used is a quasi-experiment with a Nonequivalent Control Group Design. The research sample consisted of two classes: class XI-3, the control class, and XI-4, the experimental class, each with 36 students. The research instrument was a multiple-choice learning-outcome test consisting of 15 questions, validated by an expert and found to have 82% validity. Pretest and posttest data were analyzed using the SPSS program version 26.0. The t-test results showed a p-value of 0.043 < 0.05, so H0 was rejected, and H1 was accepted. Thus, it can be concluded that the application of the Problem-Based Learning (PBL) model significantly improves student learning outcomes in colloidal systems. This study provides empirical evidence that the application of PBL can increase active involvement and student learning outcomes, and can serve as a reference for teachers in developing more contextual and student-centered chemistry learning strategies.
Development of a Virtual Laboratory with a Project for Teaching Complexometric Titration to Improve Learning Outcomes Khoirul Bariah; Manihar Situmorang
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.pp39-45

Abstract

The teaching of complexometric titration has not yet utilized learning media that can foster student activity, so that, in terms of cognition, students' abilities remain low. Another problem was that experiments in complexometric titration were not conducted due to limited practical work time following the implementation of block learning. The purpose of this study is to develop a virtual laboratory project to teach complexometric titration and improve student learning outcomes. This research is a Research and Development study using the ADDIE model (Analysis, Design, Development, Implementation, and Evaluation). This study involved 72 students from two classes of the Chemistry Education study program in the 2023-2024 academic year. The research instruments used were a virtual laboratory feasibility questionnaire, a test, and a response questionnaire. The results showed that the virtual laboratory media had a feasibility of 87.22%, indicating it is highly feasible for use. Student learning outcomes from objective tests showed that the N-Gain in the class was 0.68, a significant increase compared to the control class's 0.55. The student response to the development of the virtual laboratory project is 87.65%, which falls in the very good category. Therefore, it can be concluded that developing a virtual laboratory with projects is highly feasible for use in complexometric titration instruction to improve student learning outcomes.
Utilizing Organic Waste to Create Charcoal Briquettes as a Substitute Fuel Aldi F. Uke; Sitti Rahmawati; Magfirah Magfirah; Afadil Afadil; Dewi Salmita; Vivi D. A. Sangkota
Jurnal Akademika Kimia Vol. 15 No. 2 (2026)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2026.v15.i2.pp97-103

Abstract

The generation of organic waste at SMA Negeri 1 Palu is substantial, and it is predominantly disposed of in landfills, leading to environmental concerns and the underutilization of potential resources. This study proposes converting organic waste into charcoal briquettes as a sustainable alternative for waste management and energy production. The objective of this research is to evaluate the composition and physicochemical properties of charcoal briquettes produced from organic waste generated at SMA Negeri 1 Palu. The briquettes were prepared from collected organic waste and characterized using standard fuel-quality parameters. The results showed that the produced briquettes exhibited a calorific value of 4385 cal.g-1, density ranging from 0.75 to 0.86 g.cm-3, and a combustion rate of 0.25 g.s-1. In addition, the moisture content, ash content, volatile matter, and fixed carbon were 7.5091%, 5.5894%, 16.1316%, and 78.279%, respectively. These findings indicate that organic waste-derived briquettes possess acceptable fuel characteristics and demonstrate potential as an alternative renewable energy source. This study highlights a practical approach to reducing organic waste while simultaneously generating value-added energy products, particularly in educational institutions.
Development of a Chromatography Textbook Based on Project-Based Learning Using an Ethnoscience Approach with Augmented Reality Hanisah Hasibuan; Sri A. Sari; Marudut Sinaga
Jurnal Akademika Kimia Vol. 15 No. 2 (2026)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2026.v15.i2.pp86-96

Abstract

Advances in chemistry during the Fourth Industrial Revolution demand learning that integrates concept mastery with 21st-century skills, yet current materials rarely combine local wisdom and digital technology. This study aimed to develop a chromatography textbook based on Project-Based Learning (PjBL), using an ethnoscience approach and Augmented Reality (AR), suitable for learning. The Research and Development (R&D) method, using the 4D model (Define, Design, Develop, Disseminate), was employed. The pilot study involved 20 Chemistry Education students, with expert validation sheets and student response questionnaires as instruments. The results of the expert validation indicated that this textbook is highly suitable, with an average content suitability percentage of 93.75%, graphic suitability of 93.75%, presentation suitability of 94.84%, and linguistic suitability of 100%. A pilot test conducted on a small group revealed highly positive student responses, with an average score of 3.88 (97.02%). These findings imply that integrating PjBL, ethnoscience, and AR can effectively support contextual, student-centered, and technology-enhanced chemistry learning. In practice, this approach can serve as a model for developing innovative instructional materials for other chemistry topics and for supporting curriculum transformation toward 21st-century skills.
Analysis of Activated Carbon Bone of Yellowfin Tuna Fish H3PO4 as Fe Metal Adsorbent in Solution Mutmainah I. Supu; Nurhayati Bialangi; Hendri Iyabu; La Alio; Vivi D. A. Sangkota
Jurnal Akademika Kimia Vol. 15 No. 2 (2026)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2026.v15.i2.pp104-110

Abstract

Iron (Fe) pollution in Indonesian waters frequently exceeds health thresholds, necessitating the development of efficient biomass-based adsorbents, such as tuna bone. This study aims to analyze the characteristics of yellowfin tuna bone (Thunnus albacares) activated carbon activated with phosphoric acid (H3PO4) and its effectiveness as an iron (Fe) adsorbent. The research methods included preparation, carbonization at 300°C, and chemical activation using various H3PO4 concentrations (3M, 5M, and 7M) for 24 hours. Activated carbon characterization was conducted through moisture content, ash content, iodine absorption tests, and SEM-EDS analysis. Fe adsorption tests were performed at concentrations of 5, 10, and 20 ppm using Atomic Absorption Spectrophotometry (AAS). The results indicated that increasing H3PO4 concentration decreased ash content and enhanced iodine absorption. Activation with 7M H3PO4 yielded the best characteristics, featuring an ash content of 0.53%, an iodine absorption of 716.99 mg/g, and a porous surface morphology. In adsorption testing, the 7M activated carbon was most effective at a high Fe concentration (20 ppm) with an efficiency of 61.52% and an adsorption capacity of 2.46 mg/g. Further research may focus on optimizing adsorption parameters such as pH, contact time, temperature, and adsorbent mass, as well as using FTIR analysis to identify the functional groups present in the adsorbent.
Development of Problem-Based Learning E-Worksheet Oriented ESD on Macromolecules in Bioadsorbent Context to Foster Scientific Literacy Denaya A. Fadiah; Hernani Hernani; Asep Supriatna
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.pp61-69

Abstract

The Industrial Revolution 4.0 demands 21st-century competencies, particularly scientific literacy, which remains low in Indonesia as evidenced by the 2022 PISA score of 383, well below the OECD average of 485. One approach is to develop interactive learning materials that integrate Problem-Based Learning (PBL) and Education for Sustainable Development (ESD). This study aims to examine teachers’ perspectives on the need for a PBL-based e-worksheet oriented toward ESD in the bioadsorbent context, determine its design and validation results, and evaluate students’ scientific literacy profile on a limited trial. This study employed a Design and Development Research (DDR) approach with three stages: planning, production, and evaluation. The planning stage involved a needs-analysis questionnaire administered to chemistry teachers at several public high schools in Bandung, followed by an analysis of Merdeka Curriculum learning outcomes, ESD dimensions, and the PISA 2025 scientific literacy framework. The production stage involved designing the e-worksheet in Canva, converting it via Liveworksheets, and validating it with four chemistry validators. The evaluation stage was conducted through a limited trial involving 16 12th-grade high school students at SMA Negeri 1 Margahayu. Results showed that all teachers considered the use of banana peels as a heavy-metal bioadsorbent highly relevant for Macromolecule learning in Phase F and in need of further development. Validation results for content, instruction, language, and appearance ranged from 97% to 100%, placing them in the very good category. The limited trial revealed students’ scientific literacy profiles across all PBL stages in the good-to-very-good category, encompassing content, procedural, and epistemic knowledge, as well as competencies in explaining phenomena scientifically, designing investigations, and using scientific information for decision-making. These findings confirm that the developed e-worksheet is a promising pedagogical tool for enhancing scientific literacy through real-world sustainability issues in chemistry learning.
Analysis of Calcium Content in Tuna Bones Using an Enzymatic Method I M.W. Wijaya; Erni Mohammad; Najmah Najmah; Netty I. Ischak; Arviani Arviani
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.pp70-76

Abstract

Bone waste of mackerel tuna (Euthynnus affinis) has great potential as a natural source of calcium. The enzymatic approach using papain offers a safe, environmentally friendly method for green extraction. This study aims to evaluate the effects of variations in papain concentration on the yield and calcium content of cod fish bone hydrolysis. The method used was a one-factor Complete Random Design with four levels of papain concentration (6, 8, 10, and 12 %) and three replicates. Hydrolysis is carried out at 60 °C and pH 6.5 for 4 hours. Calcium levels were analyzed using an Atomic Absorption Spectrophotometer (SSA) at a wavelength of 422 nm. ANOVA showed that papain concentration had a significant effect on yield (p < 0.05) but not on calcium content (p > 0.05). The highest yield, 105.66%, was obtained at a 6% concentration and was influenced by post-hydrolysis water retention and residual salt retention from the buffer solution. Meanwhile, the highest calcium release was achieved at a 10% concentration of 165.63 mg/g. Hydrolysis with papain has been shown to effectively degrade the collagen matrix, releasing minerals without damaging the bone's hydroxyapatite structure. Implicitly, this study offers an efficient method for the fishery waste treatment industry to produce alternative calcium supplements, while guiding the optimization of enzyme dosage based on production-target priorities.

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