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INDONESIA
IJFAC (Indonesian Journal of Fundamental and Applied Chemistry)
Published by Universitas Sriwijaya
ISSN : 25409395     EISSN : 25409409     DOI : -
Core Subject : Science, Social,
Biochemistry, Genetics & Molecular Biology Chemistry Environmental Science
Indonesian Journal of Fundamental and Applied Chemistry (IJFAC) is an international research journal and invites contributions of original research articles as well as review articles in several areas of chemistry. The journal aims to publish refereed, high-quality research papers with significant novelty and short communications in all branches of chemistry. Papers which describe novel theory and its application to practice are welcome, as are those which illustrate the transfer of techniques from other disciplines. IJFAC calls for papers that cover the following fields: Biochemistry Inorganic chemistry Physical chemistry Organic chemistry Analytical chemistry Applied Chemistry All papers are peer reviewed by at least two referees. Papers presented at conferences are peer reviewed and selected with the same standards as individually submitted papers. They therefore have the same archival value. Article should be submitted by the Online Submission Module at www.ijfac.unsri.ac.id or email to ijfac@unsri.ac.id
Arjuna Subject : -
Articles 9 Documents
 1 
Search results for , issue "Vol 10, No 2 (2025): June 2025" : 9 Documents clear
Study of Congo Red Adsorption by Chitosan-Graphene Oxide (Chitosan-GO) Composite Synthesize with Hydrothermal Synthetic Method: Optimization and Determination Condition Desnelli, Desnelli; Safitri, Siska; Musifa, Eva; Hamidah, Afreni; Suheryanto, Suheryanto; Mara, Ady; Said, Muhammad
IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Vol 10, No 2 (2025): June 2025
Publisher : IJFAC (Indonesian Journal of Fundamental and Applied Chemistry)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24845/ijfac.v10.i2.101

Abstract

This research aims to synthesize chitosan-graphene oxide (chitosan-GO) material using the hydrothermal method at varying material ratios and adsorption studies on Congo red. Chitosan-GO composites were synthesized with mass ratios of (1:1), (1:3) and (1:5). The synthesized chitosan-GO composite was applied to absorb Congo red dye. The adsorption process is carried out by varying pH, contact time, concentration and temperature. The chitosan-GO composite was characterized using XRD, BET and SEM-EDS. The results of XRD characterization of the chitosan-GO composite with a ratio of 1:1 showed a diffractogram of 2θ = 22.3°, at a ratio of 1:3 the diffractogram angle was 2θ = 22.1°, while the ratio (1:5) of the diffractogram peak obtained was 2θ = 22.8°. The surface area obtained in chitosan-GO composite was 11.60 m2/g. The morphology of the chitosan-GO composite (1:5) is in the form of crystalline lumps with the constituent elements C (65.98%), O (32.68%), Na (0.22%) and S (0.09%). Adsorption of Congo red dye using chitosan-GO composite obtained optimum conditions at pH 7, contact time 50 minutes, Congo red concentration 45 mg/L and temperature 50°C. The adsorption isotherm is in accordance with the Langmuir isotherm model and the maximum adsorption capacity (Qm) is 10.245 mg/g.
The Effect of Using Wet Ash as a Substitute for Quicklime in Improving the Quality of Acid Mine Drainage from Coal Mining Fikri, Muhammad; Agustina, Tuty Emilia; Hermansyah, Hermansyah
IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Vol 10, No 2 (2025): June 2025
Publisher : IJFAC (Indonesian Journal of Fundamental and Applied Chemistry)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24845/ijfac.v10.i2.154

Abstract

Acid Mine Drainage (AMD) management uses the active treatment method with the addition of alkaline neutralizing chemicals such as lime (CaCO3, CaO) although the cost is more expensive. Several previous studies indicate that the application of boiler ash can increase pH and nutrient content because it is alkaline. The boiler ash used in this study came from the remaining burning of bark at a Medium Density Fiberboard industrial. Boiler ash containing water is known as Wet Ash and is strongly alkaline (pH 11.92). The purpose of this study was to analyze the effect of adding wet ash and to analyze the effectiveness of AMD processing on pH, Total Suspended Solids (TSS), Fe and Mn. The method this study: wet ash samples of 2.5 g, 5 g, 7.5 g, 10 g, 12.5 g and 15 g were mixed with 10 liters of AMD, homogenized for 10 minutes, then analyzed in the laboratory to determine its characteristics. The results of the study on the characteristics of wet ash treatment of 15 g/L with pH = 7.21, TSS = 326 mg/L, Fe = <0.018 mg/L, Mn = 6.42 mg/L is the best treatment because all parameters meet the quality standards.
Antibacterial Activity of Nanocomposite Chitosan-Silver Nanoparticle with Cymbopogon citratus Extract as a Bioreductor Against Staphylococcus aureus Anggraeni, Rezky; Melyda, Ananda Shelly; Pakpahan, Alfred; Ranggaini, Dewi; Halim, Johni; Komariah, Komariah
IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Vol 10, No 2 (2025): June 2025
Publisher : IJFAC (Indonesian Journal of Fundamental and Applied Chemistry)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24845/ijfac.v10.i2.112

Abstract

Nanocomposites are materials formed by combining two components, one or both of which are on the nanometer scale. The nanocomposite in this study is a combination of chitosan and silver nanoparticles produced through the synthesis of silver nitrate using Cymbopogon citratus extract. Silver nanoparticles have antibacterial abilities that can be utilized to overcome various diseases. However, their antibacterial properties may be reduced due to the tendency of silver nanoparticles to agglomerate. This can be overcome by the addition of chitosan as a stabilizing agent to prevent agglomeration and maintain the antibacterial effectiveness of silver nanoparticles. This study aims to evaluate the antibacterial activity of a nanocomposite formed by combining chitosan and silver nanoparticles synthesized using Cymbopogon citratus extract against Staphylococcus aureus through the diffusion method. The samples used included nanocomposites at concentrations of 6.25 mg/mL, 12.5 mg/mL, 15 mg/mL, 25 mg/mL, and 50 mg/mL, amoxicillin as a positive control, Acetic acid, and distilled water as negative controls. The results of antibacterial activity testing showed that all nanocomposite test concentrations had the ability to inhibit the growth of Staphylococcus aureus as evidenced by the formation of an inhibition zone around the disc paper. However, the highest antibacterial activity shown by the nanocomposites was still lower compared to the antibacterial activity of amoxicillin Keywords: Antibacterial activity, Chitosan, Cymbopogon citratus, Silver nanoparticles, Staphylococcus aureus
Effects of Crosslinker and Silicon to Enhance Taber Abrasion and Physical Properties of Finished Leather for Upholstery Furniture Rahmawati, Atiqa; Nurbalia, Elis; Tiyastuti, Rini
IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Vol 10, No 2 (2025): June 2025
Publisher : IJFAC (Indonesian Journal of Fundamental and Applied Chemistry)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24845/ijfac.v10.i2.79

Abstract

Finishing is one of the stages in leather processing. The addition of silicone and crosslinker in the top coat of the finishing stage of leather upholstery furniture is used to increase abrasion resistance, which is a critical factor in determining the life and quality of leather furniture. The aim of this study was to determine the influence of silicone and crosslinker additions on the abrasion resistance and physical properties of leather upholstery furniture. The leather material used is dyed crust leather with a thickness of 1.2-1.4 mm with an area of 1.5 sqft. The addition of crosslinker and silicone is applied only to the top coat. The analyses performed include physical skin analysis (adhesion test, rubbing fastness, glossy test, and flexing) and organoleptic tests (abrasion and smoothness tests). The addition of crosslinker and silicone can affect the physical and organoleptic quality of leather. The addition of crosslinker and silicone to the top coat showed the best results on upholstery leather sample D (3% crosslinker and 4% silicone).The results of statistical tests using the multinomial logistic regression method in organoleptic testing and ANOVA in physical testing showed that only crosslinker had a significant effect on the response. 
Modification of SiO2 from Rice Husk with Polyvinyl Alcohol (PVA) as Adsorbent of Congo Red Dye Sibarani, Robert; Abdullah, Abdullah; Hariani, Poedji Loekitowati
IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Vol 10, No 2 (2025): June 2025
Publisher : IJFAC (Indonesian Journal of Fundamental and Applied Chemistry)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24845/ijfac.v10.i2.117

Abstract

Rice husk is an agricultural waste abundant in silica (SiO₂). SiO2 extracted from rice husk has a porous structure, so it has the potential to be used as an adsorbent material. To increase the stability and effectiveness of the adsorption process, SiO2 was modified by adding Polyvinyl Alcohol (PVA) and used to removal Congo red dye. SiO₂ extraction was carried out through a calcination process at three different temperatures, namely 600, 700, and 800 °C. Morphological analysis and elemental composition using SEM-EDX showed the presence of a polymer layer on the surface of the material, which functions as a distribution medium for SiO₂ particles. In addition, an increase in carbon (C) content was detected after the addition of PVA, confirming the presence of PVA in the composite. The optimum conditions for the adsorption process of Congo red dye by SiO₂-PVA were obtained at pH 1, contact time 75 minutes, and solution concentration 75 mg/L. Experimental data showed that the Langmuir isotherm model was most suitable for describing adsorption behavior compared to the Freundlich model, with an adsorption capacity of 14.31 mg/g. These results indicate that SiO₂-PVA has the potential as an alternative adsorbent for the treatment of waste containing dyes.  
Synthesis of Bentonite-TiO2 Bionanocomposite for Photodegradation of Used Lubricating Oil Siregar, Sri Hilma; Nasution, Hasmalina; Fitri, Rennadya Sekar; Ramadhanti, Aulia Rizki
IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Vol 10, No 2 (2025): June 2025
Publisher : IJFAC (Indonesian Journal of Fundamental and Applied Chemistry)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24845/ijfac.v10.i2.86

Abstract

Used lubricating oil waste contains heavy metal components which, if they enter the water, will block light. Used lubricants include toxic and hazardous waste (B3) so they need further processing before being reused or thrown away, because they are dangerous for human health and the environment. This research aims to determine the ability or effectiveness of the Bentonite-TiO2 composite in degrading used lubricating oil. The research began by synthesizing Bentonite-TiO2 where the composite results obtained were characterized. Based on the results of the FTIR spectrum analysis of Bentonite-TiO2, Ti was successfully modified in bentonite because the wave number 1419.84 cm-1 shows the presence of Al-O groups and the wave number 1423.92 cm-1 shows the presence of Ti-O-Ti vibrations. The results of XRD characterization show that TiO2 has formed in the bentonite-TiO2 composite, this makes the bentonite-TiO2 more stable and can be used as photocatalysis in the processing of used lubricating oil. The results of SEM-EDX analysis of Bentonite-TiO2 show the chemical composition of C, O, Al, Si, Ca, and Ti. In photodegradation, the mass variation viscosity value with an optimum time of 5 hours is the highest viscosity value, namely with a viscosity value of 5.11 cSt.
Recent Update on Various Ion Doped Nanoparticles Applied in Biomedical: Challenges and Future Perspective Herbanu, Aldi; El Muttaqien, Sjaikhurrizal; Jabatsudewa Maras, Muhammad Artha
IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Vol 10, No 2 (2025): June 2025
Publisher : IJFAC (Indonesian Journal of Fundamental and Applied Chemistry)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24845/ijfac.v10.i2.126

Abstract

In the last several years, there have been a considerable increase in the number of use of nanoparticles (NPs) in dental application. For application and study, a wide range of ion doped NPs are accessible. The NPs differ from conventional materials in term of their distinctive structures and properties. However, researchers don't always understand how these NPs with their unique properties work. The NPs foundation in material science as well as benefits and drawbacks are discussed, primarily based on a review of the most cited scientific papers in the international peer-reviewed journal sciences. To meet the requisite topic of the study, 22 titles from MEDLlNE (PubMed) databases and 145 titles from the Scopus database were screened. It was determined from the included papers that this review takes into account several facets of the preparation of different ions for doping dental NPs and their therapeutic uses of doped hydroxyapatite (HAP). Understanding the physical, chemical, and biological aspects of NPs may help us to comprehend their benefits, drawbacks, and particular advantages. Although NPs offer great potential for the future, they do not necessarily have the best qualities, particularly in the biomedical field.Keywords: Ions-doped; bone remodeling; doped hydroxyapatite; nanoparticles; regenerative therapy
Biodiesel Production from Waste Cooking Oil by Alkaline Transesterification Process Alkinani, Sudad Asaad; Al-Mousawi, Adnan A.; Okash, Anfas N.; Moyel, Mohammad Salim; Alyousif, Nassir Abdullah; Neamaa, Haider Hashim
IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Vol 10, No 2 (2025): June 2025
Publisher : IJFAC (Indonesian Journal of Fundamental and Applied Chemistry)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24845/ijfac.v10.i2.92

Abstract

The depletion of fossil fuels, coupled with frequent instability in their prices and environmental concerns related to the drawbacks of full dependence on conventional fossil fuels. considerably, biodiesel is found to be an ideal source of fuel that can efficiently replace conventional fuel diesel. Among various raw materials that can be exploited to produce biodiesel, waste cooking oils are highly recommended as an economically attractive option for biodiesel production. However, the high content of free fatty acids (FFA) in waste cooking oils presents the main barrier to the transesterification process. Therefore, in the current study, two types of waste cooking oils (WCO) collected from homes and restaurants were tested and the percentage of FFA in them was determined through a titration process. The results showed that the percentage of FFA in used cooking oils collected from homes was (1.193%), in contrast with (2.0096%) in WCO observed from the restaurant samples. Thus, WCO collected from homes was candidate to produce biodiesel and it was characterized using FTIR. Transesterification process was carried out in the presence of an alkaline catalyst (KOH), and the yield of biodiesel was reached to 85.4% in the presence of a 1% catalyst at 65 °C degrees and methanol to oil ratio of 6:1 for 90 min. The resulting biodiesel was characterized using FTIR and GC-MS, its properties such as density, kinematic viscosity, cloud point, and pour point were diagnosed as good biodiesel properties based on ASTM standards. The results showed that the alkali-catalyzed transesterification process is an effective way to produce biodiesel from WCO as a source of energy in addition to reducing environmental pollution.
Effect of Hydrogen Flow Rate on MEA Performance with a Three-Catalyst-Layer Pt/C Configuration Yulianti, Dwi Hawa; Rohendi, Dedi; Budiman, Rahmadi; Firanda, Dera Okta; Rachmat, Addy; Sya'baniah, Nyimas Febrika
IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Vol 10, No 2 (2025): June 2025
Publisher : IJFAC (Indonesian Journal of Fundamental and Applied Chemistry)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24845/ijfac.v10.i2.146

Abstract

An essential component in Proton Exchange Membrane Fuel Cells (PEMFCs) is the Membrane Electrode Assembly (MEA), which facilitates the electrochemical reaction between hydrogen and oxygen to generate electrical energy. This study examines the effect of varying hydrogen gas flow rates on the performance and durability of a Pt/C-based MEA. The MEA used in this research measures 6.5 cm × 30 cm with a catalyst loading of 2 mg/cm². The electrode is constructed in three layers of catalysts to maximize interfacial contact within the catalyst layer. The tested hydrogen flow rates were 100, 200, 300, and 400 mL/min. Performance evaluation was conducted through polarization (I–V) and power (I–P) curve measurements. The results indicated optimal performance at a 200 mL/min flow rate, with a maximum power density of 3.563 mW/cm² and a current density of 10.256 mA/cm². Durability testing was carried out under a constant current of 2 A for 12 hours and showed a voltage drop of 24.35% after 10 hours of operation. Electrochemical characterization using Cyclic Voltammetry (CV), Electrochemical Impedance Spectroscopy (EIS), and Linear Sweep Voltammetry (LSV) yielded an Electrochemical Surface Area (ECSA) of 1.477 × 10⁻⁵ m²/g, electrical conductivity of 3.218 × 10⁻⁴ S/cm, and an electric charge of 4.2 × 10⁻⁶ C.

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