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Hydrogen: Jurnal Kependidikan Kimia
Published by Universitas Pendidikan Mandalika
ISSN : 23386487     EISSN : 26563061     DOI : Prefix 10.33394
Core Subject : Science, Education,
Chemistry Education
Hydrogen: The Chemistry Education Journal published by the Chemistry Education Study Program which contains articles raised from the results of conceptual research and studies in chemistry and chemistry education including education and learning, device development, media and learning models.
Arjuna Subject : Kimia(semua kategori) - Kimia (Lain-Lain)
Articles 721 Documents
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Quality Analysis of Virgin Coconut Oil Resulting From a Combination of Fermentation and Controlled Heating Using Silica by Rice Husk Ash Fahdila Rahmadani; La Harimu; Rahmanpiu
Hydrogen: Jurnal Kependidikan Kimia Vol. 14 No. 2 (2026): April 2026
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v14i2.20244

Abstract

Virgin Coconut Oil (VCO) has unique characteristics such as a very clear color resembling mineral water, low water and free fatty acid content, and high lauric acid content. The purpose of this study was to compare the quality of physical, chemical, and organoleptic parameters of VCO before and after adsorption with rice husk ash silica. The method used was adsorption. The adsorbent is arranged to a height of 4 cm with a flow rate of 14 drops per minutes. The results showed that the clarity test before and after adsorption was 85.8% and 97.9%. The water content before and after adsorption was 0.29% and 0.07%; free fatty acids were 0.49% and 0.17%; peroxide value was 1.98 mg eq/kg and 1.48 mg eq/kg; and saponification value was 189.34 mg KOH/g and 229.24 mg KOH/g. The average organoleptic color test before and after adsorption was 3.07 and 4; ordor was 3.33 and 3.2; and tastes 2.8 and 2.4, meet SNI 7381:2008 and SNI 2015. Thus, it can be concluded that rice husk ash silica can improve the quality of VCO.
In Vitro Evaluation of the Anti-Diabetic Potential of Oxovanadium(IV) Complex with Terpyridine Ligand Fakhrotun Nisa; Djulia Onggo
Hydrogen: Jurnal Kependidikan Kimia Vol. 14 No. 2 (2026): April 2026
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v14i2.20322

Abstract

An oxovanadium(IV) complex with 2,2′:6′,2″-terpyridine ligand, [VO(terpy)]SO₄, was synthesized and characterized to evaluate its anti-diabetic potential. The complex was synthesized via a direct reaction between VOSO₄ as the metal source and terpyridine ligand in solution and confirmed through conductometric and mass spectrometric analyses. Conductivity measurements indicated that the complex behaves as a 2:2 electrolyte in aqueous solution, dissociating into [VO(terpy)]²⁺ and SO₄²⁻ ions. Mass spectrometry revealed a peak at m/z 150.0098 corresponding to the cationic species. The anti-diabetic activity was evaluated through in vivo studies using alloxan-induced diabetic rats, demonstrating a significant reduction in fasting blood glucose levels. These findings suggest that the oxovanadium(IV)–terpyridine complex is a candidate for further development as an anti-diabetic agent.
Antibacterial Activity Test of Staphylococcus aureus from Henna Leaf Extract (Lawsonia inermis Linn) Laily Nurliana; Halimatussaddiyah Ritonga; Fatmawati; Rustam Musta
Hydrogen: Jurnal Kependidikan Kimia Vol. 14 No. 2 (2026): April 2026
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v14i2.20341

Abstract

An antibacterial activity test against Staphylococcus aureus using henna leaf extract (Lawsonia inermis Linn.) has been conducted. This study aimed to determine the secondary metabolite components and the major compounds present in the henna leaf extract, as well as its inhibitory activity against Staphylococcus aureus. The secondary metabolite components were identified through phytochemical screening, while the major compounds were determined using GC-MS. The antibacterial activity was tested at concentration variations of 75%, 50%, 25%, and 12.5%. The resulting inhibition zones were then categorized according to standard criteria. The significance of the effect of concentration on the inhibition zones was analyzed using a one-way ANOVA test, followed by LSD test at α = 0.05. The results showed that the henna leaf extract tested positive for flavonoids, alkaloids, tannins, and quinones and GC-MS analysis shows compounds included 1,5-heptadiene-3,4-diol, 2-methyl-; 2-undecene, 2-methyl-; cyclotrisiloxane, hexamethyl-; 2,6-dihydroxyacetophenone; and 2,3-dihydroxybenzoic acid. The antibacterial activity test results showed that different concentrations (12.5%, 25%, 50%, and 75%) produced different inhibition zones; however, all were still classified within the same category, namely moderate. Statistical analysis indicates a significant effect of concentration on the inhibitory activity against the test bacteria, where F test = 4.771 > F crit = 4.066 at α = 0.05. Further analysis using the LSD test revealed two groups with significantly different inhibitory effects: the 75% and 50% concentration groups showed significantly higher inhibitory activity compared to the 25% and 12.5% groups.
Determination of Thorium Distribution Coefficient in Clay Soil From Bangka Belitung for Radioactive Waste Management Arya Diva Yana; Alizar Ulianas; Dadong Iskandar; Hary Sanjaya; Jon Efendi
Hydrogen: Jurnal Kependidikan Kimia Vol. 14 No. 2 (2026): April 2026
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v14i2.20366

Abstract

Radioactive waste is material contaminated by radioactive substances from nuclear activities that pose a danger to the environment and health, so controlled management is required. The purpose of this study was to test the distribution coefficient value of Bangka Belitung clay as an adsorbent to absorb thorium ions. Clay is used because of its large surface area, which helps the adsorption process of metal ions. The results of the study showed that the optimum adsorption conditions were achieved within 10 minutes with an optimum concentration of 100 ppm. Meanwhile, the results of the Langmuir isotherm analysis had a larger R2 value, namely 0.94923. This indicates that the adsorption process is more suitable for the formation of a monolayer. Based on these results, clay can be used in landfill systems to reduce the risk of groundwater pollution.
Voltammetric Detection of Zn2+ Ions Using a Glassy Carbon Electrode Modified with Napa-Soil-Derived NiAl₂O₄ Dhea Septiani; Mawardi Mawardi; Indang Dewata; Umar Kalmar Nizar; Okta Suryani
Hydrogen: Jurnal Kependidikan Kimia Vol. 14 No. 2 (2026): April 2026
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v14i2.20367

Abstract

This study reports the development of a glassy carbon electrode (GCE) modified with NiAl2O4 derived from napa soil for the voltammetric detection of Zn2+ ions. The modified electrode was prepared using a drop-casting method and characterized in 4.0 mM K3[Fe(CN)6] with 0.1 M KCl as the supporting electrolyte. The results showed an increase in oxidation peak current from 19.93 µA (bare GCE) to 26.80 µA and reduction peak current from −19.03 µA to −24.29 µA after modification, indicating enhanced electron transfer. Zn2+ detection was carried out in the concentration range of 1–3 mM, where the reduction peak current increased from −85.49 µA to −170.83 µA with increasing concentration. A linear relationship between concentration and current response was obtained with a regression equation of y = -42.67x – 40.42 and a correlation coefficient (R2 = 0.9907), indicating good linearity of the sensor. The limit of detection (LOD) was calculated to be 0.21 mM. Among the tested supporting electrolytes, 0.1 M KCl provided the highest and most stable current response. Although the modified electrode shows improved performance, the detection range is still limited to the millimolar level, and further studies are required to evaluate selectivity, reproducibility, and applicability in real samples. These findings demonstrate the potential of napa-soil-derived NiAl2O4 as a sustainable and cost-effective material for electrochemical sensing applications.
Development Local Culture-Based Science E-Supplements with “Gerakan Kebiasaan Anak Indonesia Hebat” on Additives Substance Dinno Afriza; Hairida; Eni Mayasari
Hydrogen: Jurnal Kependidikan Kimia Vol. 14 No. 2 (2026): April 2026
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v14i2.20327

Abstract

Science learning on additive materials in schools has not yet utilized local culture as a learning context, resulting in a gap between students’ real-life experiences and the scientific concepts studied in the classroom. “Gerakan 7 Kebiasaan Anak Indonesia Hebat” carried out by the Ministry of Primary and Secondary Education which is designed as a strategy in building positive habits in learning, especially the habits of liking to teach, eating healthy and nutritious, and socializing. This study aims to develop a science e-supplement based on the local culture of Kapuas Hulu Regency and to examine its feasibility and user responses. The development model used is ADDIE, limited to the Development stage. The research procedures include needs analysis through teacher interviews, design and development of the e-supplement, and validation by material, media, and language experts. Teacher and student responses were collected using questionnaires. The validation results indicate that the e-supplement is categorized as highly feasible, with scores of 95.50% (material), 95.21% (media), and 95.83% (language). Teacher response results reached 91.66%, while student responses in small-scale and large-scale trials reached 97.34% and 98.62%, respectively. These findings show that the local culture-based science e-supplement is easy to use, engaging, and helps improve conceptual understanding. Therefore, the e-supplement is suitable to be used as supplementary teaching material in science learning.
Effect of Operating Temperature on Marine Fuel Oil (MFO) Quality Parameters Nissa Atviona; Alizar Ulianas; Ihut Parulian
Hydrogen: Jurnal Kependidikan Kimia Vol. 14 No. 2 (2026): April 2026
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v14i2.20451

Abstract

Marine Fuel Oil (MFO) is a residual fuel widely used in heavy industries, whose quality is influenced by refining operating conditions. This study aims to evaluate variations in key quality parameters of MFO, namely flash point, density, and viscosity, using samples obtained from a petroleum refinery in Riau, Indonesia. Data were collected through direct observation and laboratory testing during a 10-day industrial internship period using standardized ASTM methods. The results indicated that the flash point ranged from 61.83 to 73.50 °C, density ranged from 922.7 to 928.8 kg/m³, and viscosity ranged from 132.7 to 185.0 cSt. Variations in these parameters were observed during the monitoring period. However, further statistical analysis is required to confirm the strength and significance of the relationship between operating temperature and product quality. These findings highlight the importance of consistent monitoring and control of operating conditions to maintain product quality within industrial specifications.
The Impact of the Discovery Learning Model on Learning Outcomes in Basic Chemistry at SMAN 1 Sungayang Widia Rahmanda; Elvy Rahmi Mawarnis; Dwivelia Aftika Sari
Hydrogen: Jurnal Kependidikan Kimia Vol. 14 No. 2 (2026): April 2026
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v14i2.20584

Abstract

This study explores the effect of the Discovery Learning model on student learning outcomes in basic chemistry at SMAN 1 Sungayang. This is a quantitative study with a quasi-experimental design in the form of a nonequivalent control group. The study population consisted of all 10th-grade students, with a sample of two classes selected through purposive sampling. The experimental group used the Discovery Learning model, while the control group received conventional instruction. Data analysis included tests of normality and homogeneity, followed by hypothesis testing. The results indicate that the Discovery Learning model significantly improves student learning outcomes, demonstrating its effectiveness in promoting active engagement and a deeper understanding of chemical concepts. Thus, this model can be used as an alternative in chemistry instruction to improve the quality of student learning outcomes.
Development, Validation, and Practicality of a Wordwall-Based Educational Game for Senior High School Acid-Base Learning Bunga Artika Sari; Elvy Rahmi Mawarnis; Dwivelia Aftika Sari
Hydrogen: Jurnal Kependidikan Kimia Vol. 14 No. 2 (2026): April 2026
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v14i2.20620

Abstract

This study aimed to develop and evaluate the validity and practicality of a Wordwall-based educational game for senior high school acid-base learning. The study employed a Research and Development (R&D) design using the ADDIE model, consisting of analysis, design, development, implementation, and evaluation stages. The developed media integrated game-based quizzes, instant feedback, visual elements, and concept-based challenges to support joyful learning and deepen students’ conceptual understanding of acid-base material. Data were collected through expert validation sheets, student response questionnaires, and a teacher interview. The product was validated by three expert validators and evaluated by one chemistry teacher. The implementation stage involved 29 students from class XI.F.1 and 31 students from class XI.F.2 at SMAN 10 Sijunjung. The validation results showed that the material aspect obtained a validity score of 80%, the language aspect obtained 75%, and the media design aspect obtained 95%, categorized as valid to highly valid. Student responses indicated that the media was very practical, with practicality scores of 86,75% in class XI.F.1 and 88,00% in class XI.F.2 in terms of ease of use, attractiveness, usefulness, and time efficiency. Teacher feedback also indicated that the media helped present acid-base concepts in a more interactive and engaging way. The findings indicate that the Wordwall-based educational game is feasible and practical for use as an alternative digital learning medium in acid-base instruction. Further research is recommended to examine its effectiveness on students’ conceptual understanding, learning motivation, and learning outcomes.
Synthesis of Natural Deep Eutectic Solvent from EFB Waste and Used Cooking Oil for Cathode Recovery Hadrian Hafiz; Khansa Khairunisa Karyani; Muhammad Fiqri Aulia Rahman; Sawbil Sabri; Windri Putri Lestari; Ferdinand Hidayat
Hydrogen: Jurnal Kependidikan Kimia Vol. 14 No. 3 (2026): June 2026
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v14i3.18997

Abstract

This study develops a biomass-derived natural deep eutectic solvent (NADES) by combining potassium carbonate-rich oil palm empty fruit bunch (EFB/TKKS) ash as the hydrogen bond acceptor, and polyol-rich used cooking oil as the hydrogen bond donor for cobalt recovery from spent lithium-ion battery cathodes. The novelty of this work lies in converting two abundant local waste streams into a reusable green leaching medium for battery recycling. The HBA and HBD precursors were prepared through ash extraction, used-oil purification, and hydroxylation, followed by thermal mixing at molar ratios of 1:1, 1:2, and 2:1. The products were evaluated using density, viscosity, water-solubility, FTIR, GC-MS, AAS, UV-Vis, and qualitative cobalt confirmation tests. The 1:2 ratio produced the most stable homogeneous NADES, with a density of 0.8895 g/mL and viscosity of 55.57 mPa·s. FTIR and GC-MS analyses confirmed hydroxyl-bearing components and hydrogen-bond interactions that support eutectic solvent formation. During cobalt recovery, the first three regeneration cycles produced apparent cobalt-containing solid recovery values of 53.41%, 51.11%, and 49.30%, with solid recovery yields of 99.82%, 95.52%, and 92.15%, respectively. These findings indicate that EFB- and used-cooking-oil-derived NADES is a promising waste-based solvent platform for more sustainable lithium-ion battery cathode recycling, although further optimization is required to improve cobalt recovery efficiency and long-term solvent stability.

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