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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 122 Documents
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Online Eye-Tracking: Observing the Attention of Pre-service Chemistry Teacher from Non-Science Backgrounds in Solving Chemistry Problems Khairiatul Muna; Helda Rahmawati; Muhammad Bahit; Saipul Rasid; Lutfiana Marisa; Rosana Rosana; Nurul Istiqamah
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.v10i2.96748

Abstract

Recent advances in online eye-tracking allow researchers to capture eye movements as visible markers of attentional processes. This study adopts a mixed-methods design using webcam-based eye tracking via the RealEye platform to profile the attentional patterns of pre-service chemistry teachers who completed non-science tracks in high school. Two participants from the Chemistry Education program at UIN Antasari Banjarmasin undertook a problem-solving task in chemistry; their eye movements were recorded and analyzed descriptively. In framing attention, we distinguish between overt orientation—shifts in gaze toward a target—and covert orientation—mental shifts of focus without corresponding eye movements. Findings indicate that both participants required a comparatively longer time to observe, read, and solve the given problems. These attentional profiles align with their problem-solving outcomes, which fell into the medium and low performance categories. The results suggest that a non-science secondary background may be associated with less efficient visual strategies when tackling chemistry tasks. Targeted instructional support—such as scaffolded practice with chemical representations and stepwise problem decomposition—may therefore be warranted in teacher-education curricula.
Chitosan-Silica (CS/Sc) Composites as Promising Adsorbents for Fe(III) Removal in Water Purification Yulida Amri; Fakhira Khairana; Ida Ratna Nila; Rahmatul Fajri
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.v10i3.107769

Abstract

Fe(III) contaminated water has become a serious environmental concern, creating a need for effective and affordable adsorbents. This study evaluates the performance of chitosan silica (CS/Sc) composites for Fe(III) removal. CS/Sc composites were synthesized via a sol-gel route by varying the volume ratio of 1% chitosan to 5% silica. The ratio significantly influenced surface morphology. The 4:3 composition showed silica dominance with an inhomogeneous surface, while the 4:4 composition exhibited a more porous and homogeneous structure. The 4:5 composition yielded the most homogeneous and porous surface, exhibiting increased Si and N signals, which indicate a stronger interaction between chitosan and silica. Fe(III) adsorption tests were conducted at pH 2. Both adsorption capacity (q) and adsorption efficiency (η) increased with increasing silica proportion. The CS/Sc 4:3 composite showed an adsorption capacity q of 0.391 mg g⁻¹ and an adsorption efficiency η of 5.211%. The 4:4 composite reached q of 2.701 mg g⁻¹ and η of 36.012%. The highest performance was obtained with the 4:5 composite, yielding a q of 3.266 mg g⁻¹ and an η of 43.542%. These results demonstrate that the CS/Sc composite with a 4:5 ratio is the most promising formulation for Fe(III) removal and water purification applications. The novelty of this work lies in the targeted application of CS/Sc composites for Fe(III) adsorption, which has been rarely reported, and in providing insight into how compositional variation affects structure and adsorption performance
The Project-Based Learning’s Key Characteristic: How STEAM Sparks Creativity and Curiosity in Cultivating Daphnia sp. Acid-Based Chemistry Inas Sausan; Faizal Adi Akhmad Masbukhin
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.v9i3.93190

Abstract

This study explores the integration of STEAM (Science, Technology, Engineering, Arts, Mathematics) with Project-Based Learning (PBL) to enhance creativity and curiosity in high school students within the context of chemistry education. The research involved 11th-grade students designing a Daphnia sp. cultivation pond, a project aimed at applying interdisciplinary knowledge and fostering essential 21st-century skills. Using a qualitative case study approach, data were collected through questionnaires, interviews, and student worksheets. The study focuses on an in-depth analysis of six key characteristics of STEM-PBL including driving questions, learning goals, scientific practice, collaboration, using a technological tool, and creating an artifact—creativity and curiosity as key outcomes. The results indicate a significant positive correlation between creativity and students' cognitive performance, highlighting the effectiveness of the STEAM-PBL approach in promoting innovative thinking and problem-solving skills. However, the study found no significant relationship between curiosity and cognitive scores, suggesting that curiosity may develop independently of direct academic outcomes within this framework. Despite these positive findings, the study also identified challenges such as limited resources, insufficient teacher training, and resistance to traditional educational methods. The study recommends further exploration into the long-term impacts of STEAM-PBL and its applicability across different educational contexts.
Determination of Total Flavonoid Content and antibacterial activity of Nanogel combination of Red Betel Leaf and Tapak Liman Hanun Aishy Marwa; Nadine Ayu Syaima Gustaf Prins; Alliva Ro'ain Abbiyu Imanita; Fania Putri Wiba Maharani; Rahmawati Salsa Dinurrosifa
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.v11i1.109637

Abstract

Flavonoids are secondary metabolites with antioxidant, antibacterial, and anti-inflammatory properties. This study aimed to determine the total flavonoid content of red betel (Piper crocatum) and tapak liman (Elephantopus scaber L.) extracts and to formulate them into nanogel preparations. Extraction was carried out by maceration using 70% ethanol, and total flavonoid content was measured by UV-Vis spectrophotometry with quercetin as the standard. The results showed that red betel extract contained the highest flavonoid level (75.15 ± 0.55 mg QE/g), while tapak liman extract had 22.10 ± 0.25 mg QE/g. The combined nanogel formulations contained 39.66–40.30 mg QE/g of flavonoids and met topical preparation standards, with Formula 2 showing the most optimal characteristics (particle size ±255 nm, physiological pH, good homogeneity). Antibacterial testing confirmed that all formulas inhibited Staphylococcus aureus, with Formula 3 exhibiting the strongest activity. These findings indicate that red betel and tapak liman extracts can be successfully developed into nanogel formulations as promising modern herbal preparations. 
The Effect of Additional Pineapple (Ananas comosus L. Merr.) Peel Pectin on the Characteristics of Coal Fly Ash Geopolymer Nuni Widiarti; Nandia Salsa Restu Mulyani; Ella Kusumastuti; Ridho Prasetyo
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.v10i1.97803

Abstract

Fly ash-based geopolymer concrete is a candidate for a more sustainable material than concrete, with lower embodied energy and high early-age compressive strength properties. This work has focused on studying the use of pineapple peel pectin as an additive to enhance the compressive and split tensile strength achievable in a geopolymerization process. The compressive strength and split tensile strength were tested by physical testing, and the mineral phases, functional groups, and microstructure were analyzed by chemical analysis (XRD, FTIR, and SEM-EDX). Geopolymers containing 0%, 1%, and 2.5% pectin were fabricated. The surprising optimum was the 1% variation, which reached compressive strength of 22.13 MPa and split tensile strength of 3.18 MPa when making medium-quality concrete. XRD results of the best performing 1% sample exhibited mainly an amorphous phase, where amorphization is evident at 20–40°2θ due to broad signal peaks, a sign of successful geolypolimerization. Geopolymerization was also confirmed by FTIR analysis through the presence of Si–O–Si and Si–O–Al asymmetric stretching vibration peaks at 1018.41 cm−1, illustrating the inclusion of pectin observed by the C–H stretches in the range 2900–2300 cm−1 and the carboxyl group stretch at 1635.64 cm−1. The microstructure of the quality concrete 1% formulation was characterized by a tight, perfect structure as seen through SEM images, while the 0% and 2.5% mixes had more porous and cracked structures. These results suggest that 1% pectin incorporation improves geopolymer mechanical performance without adversely affecting structure, merits for further mechanical properties, and long-term stability.
Characterization of Chicken Eggshell-Derived Hydroxyapatite/Zeolite Composite as a Methylene Blue Absorbent Nur Safitriani; Kurnia Ramadani; Sitti Chadijah; Syarifah Rabiatul Adawiah; Titik Andriani; Firnanelty Firnanelty
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.v10i1.99042

Abstract

Purebred chicken eggshell is a promising natural source because it contains high calcium carbonate (CaCO3), which is used as a hydroxyapatite (HAp) precursor, with natural abundance and biodegradability, making it an eco-friendly alternative to synthetic materials. HAp is relevant for dye removal because of its high adsorption capacity, chemical stability, and ability to interact with dye molecules through ion exchange and surface interactions with the material. The composite adsorbent of Hap-zeolite is effective for wastewater treatment based on the result of HAp-zeolite composite's adsorption capacity against methylene blue. Methylene blue is one of the dyeing wastes originating from the textile industry. The method of synthesis of Hap used precipitation. The FTIR characterization results showed OH groups at wavenumber 3434 cm-1, CO32- group with wavenumber 1421 cm-1, PO43- bending group with wavenumber 565 cm-1, and PO43- stretching at wavenumber 1035 cm-1. The highest peak XRD yield at an angle of 2θ=34.04º corresponds to a hexagonal crystal formed. The adsorption process is carried out with a HAp-zeolite mass ratio of 4:2 (w/w), with contact times for 180 minutes, resulting in the best adsorption efficiency around 99.99% measured via UV-Vis spectrophotometry. The results indicate that HAp-zeolite composites are highly effective for methylene blue removal and have potential application in wastewater treatment.
Molecular Dynamics Simulation Study: Mechanism Of Cationic And Anionic Dyes Adsorption On Montmorillonite Febriati Dian Mubarokah; Mia Ledyastuti; Muhammad Ali Zulfikar
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.v10i3.100095

Abstract

Discharging dye-containing wastewater can severely degrade water quality. Adsorption is widely studied because it is selective, effective, and relatively low cost. This work examines adsorption of a cationic dye, crystal violet (CV), and an anionic dye, congo red (CR), on montmorillonite clay (MMT) using molecular dynamics simulations in GROMACS. Molecular topologies were built with a combined ClayFF and CHARMM36 force field. Simulations used a 6 nm × 6 nm × 6 nm box filled with SPC/E water (spce.gro). After minimization and NVT and NPT equilibration, production runs were carried out for 50 ns (25,000,000 steps) with a 2 fs time step at 300 K and 1 bar. Single-dye and mixed-dye systems were compared to clarify adsorption mechanisms. In the single CV system, the best performance occurred at 20 CV molecules, giving 40% adsorption. Radial distribution analysis indicates that adsorption is dominated by van der Waals interactions between the negatively charged MMT surface and the CV quaternary ammonium site (-N+). In contrast, CR was not adsorbed in the single CR system because electrostatic repulsion prevents approach to the negatively charged clay. In mixed CV–CR systems, adsorption of both dyes increased, revealing synergistic behavior. CV enters the MMT interlayer and forms an organic phase, which then immobilizes CR through hydrophobic interactions, enabling CR adsorption despite its unfavorable electrostatics under realistic wastewater conditions.
The Influence of Fe and Cr Dopant in the Synthesis of Ca3Co4O9 Thermoelectric Material on Crystal Structure, Crystal Size, Thermal Conductivity, and Electrical Conductivity Imam Syafrudin Rahman; Rachmat Triandi Tjahjanto; Masruroh Masruroh
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.v9i3.93818

Abstract

In this work, we study, by sol-gel method, CCO doped with Fe and Cr dopants, the implications for the aspects, crystal structure, crystal size, thermal conductivity, and electrical conductivity. Nevertheless, CCO has low thermoelectric efficiency and thus still longs for optimization in response to the performance, stability, and ecological environment requirement, which needs improvement. Dope would enhance the concentration of charge carriers without modifying the material structure itself. X-ray diffraction (XRD) to characterize the crystal structure and the Williamson–Hall (WH) method to calculate the crystal size were performed. SEM-EDS analyses provide surface morphology, particle size distribution, and elemental composition. The results show that the dopants change, among others, crystal size, microstrain, crystallinity index, and thermal and electrical conductivity, but no change in the crystal structure itself for any of these dopants. Fe doping increased the crystal size of CCO to 144.816 nm (versus 143.382 nm for pure CCO). Compared to Cr doping, the crystal's size was reduced to 65.232 nm. Where the estimated thermal conductivity increased for both dopants, attaining a value of 1.985967 W/mK for CCO-Fe and 1.952233 W/mK for CCO-Cr, concerning the value of 1.740633 W/mK of undoped CCO. Electrical conductivity also expanded (14.50 S/cm for CCO; 14.67 S/cm for CCO-Fe; 14.83 S/cm for CCO-Cr). These improvements highlight the potency of Fe and Cr dopants to fine-tune the CCO for thermoelectric usage.
Biosynthesis and Characterization of SiO-Cochineal Dye Nanoparticles Based on Salak Frond Silica for Fingerprint Visualization Applications Sri Adelila Sari; Feri Yuni Asiyah Kabeakan; Rani Febriana
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.v10i2.106785

Abstract

Latent fingerprint visualization is a critical technique in modern forensic science that requires effective and environmentally sustainable coloring agents. This study reports synthesizing and characterizing a novel dyeing agent based on Cochineal insect extract combined with silica derived from salak (Salacca zalacca) bunch waste. It evaluates its application in fingerprint visualization. Cochineal extract was obtained via stepwise heating in a polar solvent, while silica was synthesized through carbonization, demineralization, destruction, and neutralization. The SiO–Cochineal nanoparticles were prepared using a stepwise thermal immobilization method, resulting in covalent bonding between the pigment and silica matrix. Structural and functional group characterization using FTIR confirmed the presence of Si–O–Si, O–H, and C=O groups, indicating successful integration. Application tests on latent fingerprints demonstrated that the composite powders produced sharp and distinct ridge patterns, particularly on non-porous substrates such as glass and optical discs. These findings suggest that SiO-Cochineal-based powders are effective for forensic applications and represent a promising green alternative for latent fingerprint visualization.
Molecular Docking Analysis of Bioactive Compounds from Jatropha Curcas L. Leaves as Lipoxygenase Inhibitors and Antioxidant Candidates Fahmi Sadik; Wa Ode Rufiyani; Muhammad Fakhrur Rajih Hi. Yusuf
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.v10i3.110639

Abstract

Oxidative stress results from an imbalance between reactive oxygen species (ROS) and the body's antioxidant defense system, contributing to various degenerative diseases. The enzyme Lipoxygenase (LOX) plays a crucial role in ROS formation; thus, its inhibition offers a strategic approach to mitigate oxidative damage. This study aims to evaluate the potential of bioactive compounds from Jatropha curcas L. leaves as LOX inhibitors using in silico approaches. The target protein (Human 15-LOX, PDB ID: 7LAF) and ligand structures were retrieved from the Protein Data Bank and PubChem. Flexible molecular docking simulations were performed using YASARA Structure to accommodate receptor side-chain adjustments, validated against the native ligand (XRP) and a positive control (Zileuton). The results revealed that Naringenin-7-O-β-D-glucopyranoside exhibited the strongest binding affinity (–10.41 kcal/mol), surpassing both the native ligand (–9.03 kcal/mol) and Zileuton (–7.48 kcal/mol), driven by extensive hydrogen bond networks with residues ASN173 and ASP625. Meanwhile, the aglycone (-)-Pinoresinol demonstrated competitive affinity (–8.80 kcal/mol) stabilized by hydrophobic interactions with PHE88 and TRP109. While glycosides showed superior potency, (-)-Pinoresinol and Epicatechin were identified as the most rational oral drug candidates, fulfilling Lipinski’s Rule of Five and demonstrating high intestinal absorption (>90%) in ADMET analysis. These findings provide a structure-based rationale for selecting J. curcas metabolites as promising LOX inhibitor candidates for further in vitro validation.

Page 9 of 13 | Total Record : 122

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