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Journal Of Research and Education Chemistry (JREC)
Published by Universitas Islam Riau
ISSN : 26858967     EISSN : 26858959     DOI : https://doi.org/10.25299/jrec.2022.vol4(1).9315
Core Subject : Science, Education, Engineering,
Chemical Engineering, Chemistry & Bioengineering Chemistry Education
1. research and reviews literature about chemistry education such as : instruction, learning and theaching, curriculum development, learning environment, theacher education, educational and educational development in chemistry education 2. research and review literature about chemistry such as : organic, inorganic physical, analitycal, biochemistry, material chemistry, environment, ethnochemistry and its application in teaching and learning
Arjuna Subject : Kimia(semua kategori) - Kimia (Lain-Lain)
Articles 102 Documents
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Efektivitas Adsorben Karbon Dioksida Berdasarkan Kapasitas Adsorpsi, Waktu Tembus, dan Keamanan: Tinjauan Naratif Phalosa, Ghani; Riadi, Taufik; Syahputra, M. Keflin
Journal of Research and Education Chemistry Vol. 8 No. 1 (2026): April
Publisher : UIR Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jrec.2026.vol8(1).27321

Abstract

Carbon dioxide accumulation in enclosed environments is a critical challenge due to its direct impact on health, cognitive performance, and operational safety. Although various carbon dioxide sorbents have been developed, existing studies generally address sorption capacity, saturation time, or safety aspects separately, resulting in fragmented evidence and not yet providing comprehensive guidance for integrated performance assessment. This study aims to address this gap through a comparative and multidimensional evaluation of various carbon dioxide sorbents based on sorption capacity, saturation time, and safety aspects. The method used is a narrative literature review with systematic collection and comparative synthesis of reputable scientific publications discussing chemical reaction-based sorbents, such as soda lime, lithium hydroxide, and calcium hydroxide, as well as physical adsorption-based adsorbents, such as activated carbon, zeolites, and metal-organic frameworks. The analysis results indicate that chemical reaction-based sorbents generally have higher sorption capacity due to the rapid chemical reaction, but potentially experience shorter saturation times and operational risks related to exothermic reactions and the formation of byproducts. In contrast, physical adsorption-based adsorbents tend to exhibit more stable dynamic performance and better regeneration ability, despite their relatively moderate sorption capacity. It is concluded that sorption capacity alone is insufficient to predict operational effectiveness. This review offers a performance-tradeoff-based evaluation framework as a basis for selecting safer and more reliable carbon dioxide sorbents in enclosed environments.
Analisis Fouling Resin dan Efektivitas Regenerasi Kimia pada Unit Mixed Bed Demin Plant Muhammad Genta Zuan Nur Illyasa; Sinardi
Journal of Research and Education Chemistry Vol. 8 No. 1 (2026): April
Publisher : UIR Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jrec.2026.vol8(1).27779

Abstract

Analysis of Resin Fouling and Chemical Regeneration Effectiveness in Mixed Bed Demineralization Units. Water requirements for various activities, such as Steam Power Plants, require water quality in the form of mineral-free water (demineralized water) obtained through a demineralization process using a mixed bed. Along with frequent use, the resin will reach saturation due to the accumulation of contaminants (fouling) bound by the resin, which leads to a decrease in water quality. This research aims to identify the type of fouling in resin based on water quality and visual observation of the resin, as well as to analyze the effectiveness of chemical regeneration. The research methods used were water quality analysis and visual observation of the resin. Furthermore, the chemical regeneration process used an acid-base method (HCl and NaOH). The results showed that the water quality had average values for silica, total hardness, and conductivity of 16.71 ppb, 0 ppb, and 0.159 µS/cm, respectively, with a removal efficiency of 98.32%, 100%, and 96.79%. However, the final test showed silica values exceeding the standard of < 20 ppb. This indicates silica leakage in the outlet water. Furthermore, the color change from white to pink indicates fouling in the anion resin. The chemical regeneration results showed an effectiveness percentage of 67.43% for silica values and 35.22% for conductivity, bringing the water quality back into compliance with the standards. It can be concluded that the chemical regeneration process with NaOH and HCl is able to restore the resin's ability to improve water quality.
Evaluasi Penggunaan Kemasan PVC, PVDC, dan HDPE terhadap Stabilitas Fisik dan Kimia Produk Kapsul Izdihar Putri, Salsabila Nur; gala , SELFINA
Journal of Research and Education Chemistry Vol. 8 No. 1 (2026): April
Publisher : UIR Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jrec.2026.vol8(1).27897

Abstract

The physical and chemical stability of health supplement capsules is influenced by the packaging materials used, particularly their barrier capacity against moisture and oxygen. However, comparative studies on the effectiveness of PVC, PVDC, and HDPE packaging materials in maintaining capsule stability remain limited. This study evaluated the effects of PVC, PVDV, and HDPE packaging on the stability of L-glutathione capsules. The research was conducted using an experimental stability design under accelerated condition at 40°C ± 2°C and 75% ± 5% Relative Humidity, with time intervals of 10, 20, and 30 days. Stability testing followed product specifications, encompassing parameters such as appearance, weight variation, disintegration time, moisture content, and L-glutathione content (active ingredient). Results revealed that PVC packaged samples exhibited noncompliance in several parameters, including appearance, weight variation, and L-glutathione content. In contrast, PVDC and HDPE packaging maintained compliance across all tested parameters throughout the storage period. PVDC demonstrated the best performance in maintaining the highest L-glutathione content consistently across all observation intervals. Statistical analysis using two-way ANOVA with two replications revealed that packaging type, storage duration, and their interaction significantly influenced L-glutathione content (p < 0,05). These findings provide important implications for the pharmaceutical and supplement industries in determining optimal packaging materials, as well as for regulatory authorities in strengthening the evaluation of packaging suitability to ensure product quality, safety, and efficacy during storage.
PENGARUH PENGGUNAAN BINDER WAX TERHADAP HASIL ANALISIS KADAR NIKEL METODE PRESS PELLET MENGGUNAKAN WD XRF S8 TIGER Iskandar, Ikram; Gala, Selfina
Journal of Research and Education Chemistry Vol. 8 No. 1 (2026): April
Publisher : UIR Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jrec.2026.vol8(1).27906

Abstract

This research is motivated by the absence of simultaneous optimization between the binder wax ratio and pressing pressure in the pressed pellet method for laterite nickel content analysis using WD-XRF. Previous studies generally only evaluated one preparation parameter separately, so the effect of the interaction of the two variables on accuracy and precision has not been comprehensively studied. This study aims to evaluate the effect of the binder wax ratio and pressing pressure on the results of nickel content analysis and compare them with Certified Reference Material (CRM). The research method includes the preparation of nickel ore samples through a process of drying, crushing, and sieving to a fine size. The samples were then mixed with binder wax at variations of 1.5%, 2.0%, and 2.5%, then pressed into pellets at pressures of 15 psi, 20 psi, and 25 psi. Nickel content analysis was carried out using WD-XRF. The results showed that the Ni content was in the range of 1.58–1.64%, higher than the CRM of 1.48%, with a difference of approximately 0.10–0.16%. This difference indicates the possibility of systematic bias in the form of overestimation which can be caused by matrix effects, particle size effects, or calibration drift. The addition of binder wax significantly reduced Ni content due to the dilution effect, while pressing pressure did not significantly affect the content value, but increased the physical quality of the pellets. In addition, the characteristics of the samples from the limonite-saprolite transition zone at a depth of about five meters also contributed to nickel enrichment. Overall, the results of the study were influenced by preparation factors, analytical methods, and geochemical conditions of the samples.
ANALISIS PARAMETER KONDISI OPERASI PROSES PASTUERISASI TERHADAP KUALITAS PRODUK MINUMAN KEMASAN MUH FIQRI; A. Sry Iryani; Mansyur, Andi Irsyam
Journal of Research and Education Chemistry Vol. 8 No. 1 (2026): April
Publisher : UIR Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jrec.2026.vol8(1).27919

Abstract

This study aims to analyze the effect of pasteurization process operating parameters—including temperature, contact time, flow rate, and pH—on the quality of packaged beverages, particularly flavored beverages and tea drinks. The pasteurization process is a thermal processing method used in the beverage industry to improve microbiological safety and extend product shelf life. The success of this process is highly influenced by the combination of operating parameters used. The research was conducted experimentally by varying the temperature, contact time, and flow rate during the pasteurization process, followed by product quality testing that included chemical parameters (pH and °Brix), microbiological parameters (total plate count/TPC), and organoleptic parameters (hedonic test). The data were analyzed descriptively to examine the relationship between process parameters and product quality. Based on the research results, it can be concluded that the appropriate combination of pasteurization parameters significantly determines the final product quality, both from chemical, microbiological, and organoleptic aspects. The results indicate that for flavored beverages, pasteurization at 65°C with sufficient contact time and a balanced flow rate effectively reduces microbial counts to undetectable levels while maintaining organoleptic quality. Meanwhile, for tea beverages, conditions at 135°C yield the best results in terms of microbiological safety and consumer acceptability. Excessively high temperatures lead to a decline in sensory quality due to the degradation of flavor and aroma components.
OPTIMASI VOLUME NaOH PADA PROSES DELIGNIFIKASI AMPAS TEBU UNTUK PRODUKSI BIOKOAGULAN DAN APLIKASINYA DALAM PENGOLAHAN LIMBAH CAIR POME: Biokoagulan Putri, Nur Aulia; Ayu Setyowati, Sekar; Tyas Suciningrum, Alfidah; Kurniawan, , Andri; Adhiksana, Arief
Journal of Research and Education Chemistry Vol. 8 No. 1 (2026): April
Publisher : UIR Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jrec.2026.vol8(1).21639

Abstract

Sugarcane waste (bagasse) is an industrial waste that has a harmful impact on public health because it contains emissions of hazardous combustion products such as volatile organic carbon (VOC) and carbon monoxide (CO). This study aims to utilize bagasse waste as a biocoagulant material in reducing these parameters through the maceration method with an extraction time of 24 hours and varying the volume of solvent (8% NaOH) 50 ml, 100 ml, 150 ml, 200 ml and 250 ml. Bagasse is processed into fine powder and used as an absorbent medium mixed with POME. The results showed that bagasse is effective in reducing TSS, TDS, and turbidity but experienced an increase in pH in POME. The largest decrease occurred in the variation of solvent volume of 250 ml with the maceration method, resulting in a decrease in TSS of up to 99%, TDS of up to 99%, a decrease in turbidity of up to 98% and pH becoming alkaline. These findings indicate that sugarcane bagasse waste has the potential as a cheap and environmentally friendly alternative material in the processing of palm oil liquid waste
PEMBUATAN BRIKET DARI LIMBAH CANGKANG INTI SAWIT (PALM KERNEL SHELL) DAN SERABUT KELAPA juni, st nabila risky; Pratama, Irham
Journal of Research and Education Chemistry Vol. 8 No. 1 (2026): April
Publisher : UIR Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jrec.2026.vol8(1).27255

Abstract

The utilization of biomass waste as an alternative energy source has gained increasing attention as a strategy to reduce dependence on fossil fuels. Palm kernel shells and coconut fiber are abundant plantation wastes in Indonesia; however, their utilization remains suboptimal. This study aims to analyze the characteristics of briquettes produced from palm kernel shells, coconut fiber, and their mixtures based on calorific value, moisture content, ash content, volatile matter, and fixed carbon. An experimental design with varying raw material compositions was employed, consisting of 100% palm kernel shells, 75:25, and 50:50 ratios (palm kernel shells:coconut fiber). The briquette production process included carbonization, grinding, mixing with starch adhesive, molding, and drying. The quality of the briquettes was evaluated through proximate analysis and calorific value measurement using a bomb calorimeter. The data were analyzed using descriptive methods and one-way ANOVA to determine the effect of composition variation on briquette characteristics. The results indicate that briquettes made from 100% palm kernel shells produced the highest calorific value of 6334.35 cal/g, while mixed briquettes ranged between 4900–5600 cal/g. The addition of coconut fiber increased moisture content and volatile matter, while reducing calorific value and fixed carbon. ANOVA results confirmed that variations in raw material composition significantly affected all tested parameters. From a practical perspective, palm kernel shells are recommended as the primary raw material for producing high-energy briquettes, while the incorporation of coconut fiber can enhance biomass waste utilization despite lowering calorific performance. This study contributes to the development of sustainable and environmentally friendly biomass-based alternative energy technologies
PERBANDINGAN ELEKTRODA Fe-SS DAN Al-SS DALAM MENURUNKAN TSS DAN KEKERUHAN LIMBAH LAUNDRY MELALUI PROSES ELEKTROKOAGULASI Novita, Diana Novita Sari
Journal of Research and Education Chemistry Vol. 8 No. 1 (2026): April
Publisher : UIR Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jrec.2026.vol8(1).27774

Abstract

Laundry wastewater contains suspended solids and colloidal particles that lead to high levels of total suspended solids (TSS) and turbidity, which may cause environmental pollution if discharged without proper treatment. Electrocoagulation is a wastewater treatment method that utilizes the in situ formation of coagulants through electrochemical reactions at metal electrodes. This study aims to compare the performance of iron–stainless steel (Fe–SS) and aluminum–stainless steel (Al–SS) electrodes in reducing TSS and turbidity in laundry wastewater. Electrocoagulation experiments were conducted at laboratory scale using voltage variations of 1.5, 3, and 4.5 V with a contact time of up to 60 minutes under neutral pH conditions. The results show that increasing voltage and contact time improved the removal efficiency of both TSS and turbidity for both electrode configurations. Under optimum conditions (4.5 V and 60 minutes), the Fe–SS electrode achieved a TSS removal efficiency of 67.14% and a turbidity reduction of 54.55%, while the Al–SS electrode resulted in a TSS removal of 64.29% and a turbidity reduction of 62.68%. These differences are attributed to the characteristics of the generated coagulants during the electrocoagulation process. The Fe–SS electrode produces Fe(OH)3 flocs that are denser and heavier, making them more effective in settling suspended solids contributing to TSS. In contrast, the Al–SS electrode forms amorphous Al(OH)3​ with a larger surface area, which enhances the adsorption of fine colloidal particles responsible for turbidity. This study indicates that electrode selection influences the effectiveness of pollutant removal in laundry wastewater electrocoagulation. Keywords : electrocoagulation, Fe-SS, Al-SS, Total Suspended Solid, turbidity
TINJAUAN BIOKIMIA ENZIM INVERTASE PADA HIDROLISIS SUKROSA: Mekanisme Katalitik, Kinetika, Faktor Fisikokimia, dan Implikasi Aplikatif Cahya Ariyanto, Piola; Linatusifa Febrianti; Maulinda Dwi Lestari; Elya Risma Nurdiana
Journal of Research and Education Chemistry Vol. 8 No. 1 (2026): April
Publisher : UIR Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jrec.2026.vol8(1).27879

Abstract

Invertase (beta-fructofuranosidase; EC 3.2.1.26) is an enzyme that catalyzes the hydrolysis of sucrose into glucose and fructose and plays a crucial role in carbohydrate metabolism, fermentation, the food industry, and biotechnology. This review article synthesizes studies on invertase classification, the sucrose hydrolysis reaction, the catalytic mechanism, the Michaelis-Menten kinetic model, the determination of kinetic parameters such as Km, Vmax, kcat, and activation energy, as well as the influence of physicochemical factors such as pH, temperature, metal ions, inhibitors, and enzyme shape on its activity and stability. In general, invertase belongs to the glycoside hydrolase family 32 and operates through a retaining double-displacement mechanism involving aspartate and glutamate residues in the active site. Changing substrate concentration increases the reaction rate to near Vmax, but real-world systems can deviate due to substrate inhibition, product inhibition, diffusion barriers, and the influence of the reaction matrix. Increasing temperature increases the reaction rate constant up to the optimum temperature, but excessive temperatures cause denaturation and deviation from the Arrhenius model. Most invertases exhibit an optimum pH in the weak acid range, although alkaline invertases and low-temperature active invertases with different characteristics exist. Various analytical methods, such as DNS, Nelson-Somogyi, Bradford, chromatography, SDS-PAGE, as well as spectroscopic and crystallographic approaches, have been used to assess the activity, purity, and molecular properties of invertases. Overall, this review demonstrates that invertase performance is a result of the interaction between protein structure, reaction conditions, and the chemical environment. Therefore, an integrated understanding of these aspects is essential for optimizing laboratory and industrial applications(Manoochehri et al., 2020 ; Lammens et al., 2009 ; Potrich & Amaral, 2018). Keywords: invertase, sucrose, hydrolysis, enzyme kinetics, physicochemical factors
PENGARUH WAKTU PENYIMPANAN DAN METODE PENGERINGAN TERHADAP STABILITAS PARAMETER PROKSIMAT BATUBARA: Indonesia Muhajir, Achmad; Iryani, A. Sry
Journal of Research and Education Chemistry Vol. 8 No. 1 (2026): April
Publisher : UIR Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jrec.2026.vol8(1).27908

Abstract

This study aims to analyze the effect of storage time and drying methods on the stability of coal proximate parameters. The parameters observed include moisture, ash, volatile matter, and fixed carbon. The experiment was conducted using storage time variations (0, 1, 2, 3, and 4 weeks) and drying methods (oven at 105°C and microwave at 300–600 W). Proximate analysis was performed based on ASTM standards. Data were analyzed using two-way ANOVA to determine the significance of the variables. The results showed that storage time significantly affected all proximate parameters, particularly increasing moisture content and decreasing volatile matter. The microwave method reduced moisture more effectively but caused greater changes in volatile matter and fixed carbon. In contrast, the oven method produced more stable and representative results. Therefore, the oven method is recommended for coal proximate analysis..

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