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JKPK (Jurnal Kimia dan Pendidikan Kimia)
Published by Universitas Sebelas Maret
ISSN : 25034146     EISSN : 25034154     DOI : -
Core Subject : Science, Engineering,
Chemical Engineering, Chemistry & Bioengineering Chemistry
The JKPK (Jurnal Kimia dan Pendidikan Kimia) is a national journal, published three times a year in April, August, and December, containing research articles on Chemistry and Chemistry education.
Arjuna Subject : -
Articles 114 Documents
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Synthesis and Characterization of Sucrose-Modified CaO Catalyst Derived from Dolomite for Transesterification of Reutealis trisperma Oil Widiarti, Nuni; Julianti, Belia Anggi Sri; Alauhdin, Mohammad; Rosanti, Yuan Maylia
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 10, No 3 (2025): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/jkpk.v10i3.103570

Abstract

This study presents a novel method for synthesizing solid base catalysts by modifying calcium oxide (CaO) from dolomite via a sucrose-mediated hydrothermal process. In this approach, sucrose acts as a complexing agent to remove magnesium ions (Mg²⁺), a structure-directing agent, and a carbon-based template. After Mg²⁺ removal, calcium species were recovered through coprecipitation using sodium carbonate. The synthesized catalysts were characterized to evaluate their structure using X-ray diffraction (XRD), identify functional groups via Fourier-transform infrared spectroscopy (FTIR), observe morphology and elemental composition through scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDX), measure particle size distribution by particle size analysis (PSA), and determine surface area through Brunauer-Emmett-Teller (BET) analysis. The catalysts exhibited a surface area of 27.411 m²/g and reduced crystallite size, both contributing to enhanced catalytic activity. In the transesterification of Reutealis trisperma oil under optimal conditions (65 °C, 3 hours, methanol-to-oil ratio 9:1), the catalyst achieved 99.40% oil conversion and 88.82% biodiesel yield. A catalyst dosage of 7.5 wt% was optimal, while higher amounts caused emulsion and soap formation due to viscosity-related mass transfer limitations. This environmentally friendly synthesis route offers a reusable catalyst system for sustainable biodiesel production from non-edible feedstocks.
The conversion of bioethanol from pineapple waste to biobutanol derivatives over NiMoO4/rGo catalyst Allwar, Allwar; Ningrum, R. B. S.; Imanya, Alya; Rahma, Adinda Zulfaati
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 9, No 3 (2024): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/jkpk.v9i3.95283

Abstract

Increasing demand for sustainable energy solutions has spurred the development of catalytic materials to convert renewable resources into value-added hydrocarbons. In this work, we investigate the feasibility of NiMoO4/rGo as an effective catalyst for converting bioethanol into renewable hydrocarbons. The surface and microstructural characteristics of rGo showed major findings like BET surface area of 26.9 m2/g with mesoporous, sufficient surface functional groups, crystalline size of 49.12 nm, and a progressive metal oxide uniform distribution on the rGo surface. The crystal morphology showed an irregular texture, suggesting strong catalytic activity. The optimal conversion was thus observed at 80°C, 90°C, and 100°C. Superior catalytic activity at 80°C afforded the resultant three major hydrocarbon-based products: 2-butanol (1.32%), isobutyl alcohol (0.89%), and 3-methyl-1-butanol (0.89%). Such products have important potential as renewable substitutes in diverse industries. Our study highlights the potential of using NiMoO4/rGo as an effective catalyst for bioethanol conversion due to its mesoporous structure, oxygen groups, and high dispersion of active metal oxide. Overall, this study renders NiMoO4/rGo a viable catalyst candidate in sustainable chemical processes and thus accelerates the application of bioethanol to manufacture precious hydrocarbon derivatives. These findings underscore the key to optimizing temperature conditions to maximize product yield and enhance the economic viability of renewable energy resources.
The Utilization of Zn-C Battery Waste and Duck Eggshells in the Synthesis of ZnO/HAp Composite as a Photocatalyst for Methylene Blue Waste Treatment Irwansyah, Ferli Septi; Staustan, Nafisah; Hadisantoso, Eko Prabowo; Eddy, Diana Rakhmawati; Noviyanti, Atiek Rostika
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 10, No 2 (2025): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/jkpk.v10i2.106962

Abstract

Synthetic dyes such as methylene blue pose a significant pollution threat due to their chemical stability, resistance to biodegradation, and adverse ecological impacts. Photocatalytic treatment with ZnO is promising; however, particle agglomeration commonly diminishes efficiency. To mitigate this limitation, a ZnO/hydroxyapatite (ZnO/HAp) composite was synthesized from Zn–C battery waste and duck eggshells via a solid-state dispersion method using ZnO: HAp molar ratios of 1:1, 1:3, and 3:1. The materials were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Photocatalytic activity was assessed by degrading 10 mL of 10 ppm methylene blue with 90 mg of photocatalyst under visible-light irradiation for 180 min. XRD confirmed the successful formation of ZnO, HAp, and ZnO/HAp composites with single-phase zincite and hydroxyapatite structures, crystallite sizes of 14.66–25.09 nm, and crystallinity values of 62.66–86.60%. SEM revealed irregular particle morphologies. All composites were photocatalytically active, achieving methylene-blue decolorization of 96.63%, 91.45%, and 81.07%, with the 1:1 composite exhibiting the highest performance. These results indicate that waste-derived ZnO/HAp composites are promising, low-cost photocatalysts for treating organic dye pollutants.
Microplastics in River Water: Raising Science Competencies and Enviromental Awarness in Secondary Education Mayasri, Adean; Reza, Muhammad; Aula, Hayatul
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 10, No 3 (2025): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/jkpk.v10i3.110706

Abstract

Guided by the PISA 2025 science framework, this study aimed to develop and validate microplastics-based chemistry teaching materials using the Four Steps Teaching Material Development (4S-TMD) model and to evaluate their impact on students’ science competencies and environmental profiles. The research employed a research-and-development (R&D) design based on the 4S-TMD stages of selection, structuring, characterization, and didactic reduction. The participants were 30 upper-secondary students (15 Grade 10 and 15 Grade 11) from Teuku Nyak Arif Fatih Bilingual School. Additional data were obtained from expert validators who reviewed the teaching materials and assessment instruments, and from microplastics identified in water samples from the Krueng Daroy River as the empirical context. The instruments comprised microplastics-based teaching materials and evaluation sheets measuring students’ science competencies and environmental profiles. Expert validation showed that the content validity ratio of the teaching materials and assessment sheets increased to acceptable values (CVR up to 1.00), indicating that all items were essential and aligned with the PISA 2025 framework. Independent-samples t-tests indicated significantly higher science competency and environmental profile scores for Grade 11 than for Grade 10 students (p < 0.05). Overall, the microplastics teaching materials developed using the 4S-TMD model were valid and showed potential effectiveness in supporting students’ ecological awareness and science competencies in line with the PISA 2025 framework.
Molecular Docking and ADMET Profiling of Cocoa Pod Husk Methanol-Extract Metabolites as Candidate PBP2a Inhibitors of MRSA Yanti, Eka Fitri; Usman, Mohammad Rofik; Furwanti, Cece
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 11, No 1 (2026): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/jkpk.v11i1.116429

Abstract

The incidence of Methicillin-Resistant Staphylococcus aureus (MRSA) resistant to β-lactam antibiotics continues to increase. MRSA resistance is primarily attributed to the presence of penicillin-binding protein 2a (PBP2a), encoded by the mecA gene. PBP2a is a unique membrane-associated enzyme in S. aureus that catalyzes the transpeptidation step in peptidoglycan biosynthesis, thereby conferring resistance to β-lactam antibiotics. Consequently, the development of novel therapeutic strategies is urgently required to combat resistant infections. An insilico approach utilizing cocoa pod husk (CPH) extract (Theobroma cacao L.) represents a promising alternative for the identification of bioactive compounds with potential anti-MRSA activity. CPH is known to contain a wide range of secondary metabolites with diverse biological properties. This study aimed to predict the PBP2a Inhibitors of compounds present in the methanolic extract of CPH using molecular docking and ADMET analysis. Molecular docking simulations were performed using AutoDock Tools, with PBP2a (PDB ID: 4CJN), retrieved from the RCSB Protein Data Bank, as the target receptor. Prior to docking, physicochemical properties of the ligands were evaluated based on Lipinski’s Rule of Five (RO5) to assess drug-likeness. ADMET profiles were subsequently predicted using the pkCSM web server. The docking results demonstrated that all candidate ligands exhibited negative binding energies (< 0 kcal/mol), indicating favorable binding affinity toward PBP2a and suggesting their potential as antibacterial candidates against MRSA. ADMET prediction results revealed that the majority of metabolites in the methanolic extract of CPH possess favorable pharmacokinetic profiles.
The Effect of Paras Stone Green Coagulant Preparation and Test Solution Concentration on Azo Dye Removal Hulwati, siti; Fardiyah, Qonitah -; Rumhayati, Barlah -
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 10, No 2 (2025): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/jkpk.v10i2.100487

Abstract

Paras Stone, a volcanic clay rich in silica (SiO₂) and widely used in Lombok, West Nusa Tenggara (NTB), for sculptures, tombstones, and decorative ornaments, produces significant residual waste during carving. This waste can be repurposed as a natural coagulant for wastewater treatment, though research on its local application remains limited. Azo dyes, particularly prevalent in the textile industry, are produced at an estimated 700,000 tons annually, with 10–15% discharged into wastewater streams, posing serious environmental risks due to their toxic and non-biodegradable nature. This study investigates the removal efficiency of Remazol Red azo dye using Paras Stone under three conditions: non-activated, physically activated, and chemically activated with HCl or H₂SO₄. Chemical activation involved immersing Paras Stone in 3 M HCl or 0.1 M H₂SO₄ solutions with stirring for 2 hours, then rinsing to neutral pH and drying. Coagulation–flocculation experiments were conducted in batch mode, consisting of a 4-minute and 20-minute coagulation phase. The results demonstrated that non-activated Paras Stone achieved the highest dye removal efficiency (95.50%), surpassing samples activated with HCl (91.57%) and H₂SO₄ (92.53%). ANOVA analysis confirmed these differences as statistically significant at the 95% confidence level. The optimum conditions were obtained with a coagulant dose of 2.75 g of Paras Stone and 2.00 g of Opuntia ficus-indica gel, applied at a Remazol Red solution concentration of 30 mg/L. The O. ficus-indica gel, prepared by extracting parenchyma tissue, grinding, centrifuging, and collecting the gel-like supernatant, was a natural flocculant that facilitated the formation of larger flocs and accelerated sedimentation. These findings indicate that non-activated Paras Stone offers an effective, low-cost, and environmentally sustainable alternative for removing azo dyes in textile wastewater treatment.
Adsorption of Free Fatty Acids in Crude Palm Oil (CPO) Using Chicken Egg Shells Marsela, Marsela; Adhitiyawarman, Adhitiyawarman; Aritonang, Anthoni Batahan
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 10, No 3 (2025): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/jkpk.v10i3.109240

Abstract

Chicken eggshell waste represents an abundant biomineral resource that can be converted into calcium oxide (CaO) to provide a low cost and environmentally friendly adsorbent for crude palm oil (CPO) refining. This study examined the effects of calcination temperature (800 and 850 °C), sodium bicarbonate (NaHCO3) activator concentration (3, 4, and 5%), and adsorbent mass (0.1, 0.5, and 0.9 g) on the adsorption of free fatty acids (FFA) from CPO. Eggshell derived CaO was produced by calcination and chemical activation, and phase formation was verified using X ray diffraction (XRD). Adsorbent quality was screened using iodine adsorption capacity, which peaked at 509.83 mg/g for CaO activated with 4% NaHCO3. XRD patterns showed that calcination at 850 °C yielded more crystalline CaO than calcination at 800 °C, supporting selection of 850 °C for subsequent activation and adsorption tests. Batch adsorption demonstrated that higher adsorbent dosage increased FFA removal, with 0.9 g providing the best performance. Under the optimum condition, FFA decreased from 12.16% to 3.08%, corresponding to 74.70% adsorption efficiency and meeting the Indonesian standard SNI 2901 2021 (maximum FFA 5%). These findings highlight chicken eggshell derived CaO as a promising, waste based substitute for commercial adsorbents in sustainable CPO purification.  
Development of a Spreadsheet-Based Virtual Laboratory to Improve Students' Science Process Skills Fitri, Cut Utari Lydia; Khaldun, Ibnu; Gani, Abdul; Zulfadli, Zulfadli; Mujakir, Mujakir
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 9, No 3 (2024): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/jkpk.v9i3.89825

Abstract

The media virtual lab was developed with a spreadsheet that displayed 168 electrolysis reactions and performed reaction calculations. The implementation is done to improve the Science Process Skills (SPS) using the power of media. The design is an application of the model Analysis, Design, Development, Implementation, and Evaluation (ADDIE) of Research and Development (R&D). The VL was validated and revised by three media experts, who gave 88 on a score scale and were categorized as the highly qualified assessment of media, material, and visual communication. VL is used more in experimental classes than in control classes and SPS. Both of these classes include descriptions of tests, while SPS description tests generated normal but distributed data with a value of 0,502>0,05. The Levene test with a value of 0.849>0.05 indicates that the data is homogenous. The VL is there is a significant difference because the result of t test value obtained are 0,000<0x7E>0.05. The percentage score of each indicator from the experimental class is compared with the control class, which has a high percentage of each indicator. The farthest difference is the domain for movement manipulation and procedure implementation skills. This lends evidence to the hypothesis test that using VL can augment SPS.
The HOTS-Characteristic Diagnostic Tests Using the System Thinking Approach to Detect Acid-base Misconceptions in High School Chemistry Fadhilah, Septy Nur; Wisudawati, Asih Widi
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 11, No 1 (2026): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/jkpk.v11i1.111442

Abstract

Systems thinking is an approach to understanding the complex relationships between components in a system by combining analytical and systematic thinking. Misconceptions in the thinking process can hinder understanding of chemical concepts, so a diagnostic instrument that can comprehensively identify errors in thinking is needed. Many diagnostic instruments have been developed, but none have used a systems thinking approach. This study aims to develop a diagnostic test instrument based on the systems thinking approach with Higher Order Thinking Skill (HOTS) characteristics. The development follows Wilson's four-block model with a sequential exploratory mixed method, covering qualitative and quantitative stages. The instrument consists of 20 graded items covering four aspects of systems thinking: particle identification, component interaction, cause-and-effect relationships through calculation, and particle interaction inference. Validation shows a high Aiken V index from experts (0.91) and teachers (0.95), indicating content, construct, and language suitability. Student responses yielded an average NRS score of 75.8% (good category), with a note of time constraints. Rasch analysis showed good reliability (0.83) and lower person reliability (0.57) due to homogeneous responses on several basic items. Theoretically, this study confirms the importance of integrating HOTS and system thinking in the development of chemistry diagnostic instruments. The resulting instrument can be used by teachers as a formative assessment to detect students' misconceptions in depth and design more targeted learning interventions.
In Silico Pharmacokinetic and Microbiota-Integrated Profiling of Resveratrol Analogs Wibowo, Dimas Aryo; Ramadhani, Dimas Gilang; Kasmui, Kasmui
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 10, No 1 (2025): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/jkpk.v10i1.100848

Abstract

Resveratrol, a polyphenolic compound, possesses extensive biological activities; however, its use in clinical applications is restricted due to its poor bioavailability and rapid metabolism. In the present work, resveratrol and 14 of its structural analogs were screened by a combined in silico methodology. The methodology integrated density functional theory (DFT) calculations, quantitative structure–activity relationship (QSAR) modeling, physiologically based pharmacokinetic (PBPK) simulations, and microbiota-associated interaction considerations. Molecular descriptors were generated from optimized geometries at the DFT level of theory to predict permeability and metabolic characteristics. PBPK modelling was used to simulate the distribution of compounds in different physiological states. In contrast, bioinformatics analysis was used to support the gene expression modulation and the response of the microbial community to the analog structure. Several analogs predicted permeability and metabolic stability significantly better than native resveratrol. Furthermore, some compounds exhibited good associations with gut microbiota and metabolic pathways that may have regulatory functions. The results indicate that certain resveratrol analogs are potential drug candidates for further in vitro and in vivo studies. Furthermore, we report a full computational framework to aid the discovery of rational bioavailable polyphenol-related drugs.

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