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INDONESIA
Indonesian Journal of Chemistry
Published by Universitas Gadjah Mada
ISSN : 14119420     EISSN : 24601578     DOI : -
Core Subject : Science, Engineering,
Chemical Engineering, Chemistry & Bioengineering Chemistry
Indonesian Journal of Chemistry is an International, peer-reviewed, open access journal that publishes original research articles, review articles, as well as short communication in all areas of chemistry including applied chemistry. The journal is accredited by The Ministry of Research, Technology and Higher Education (RISTEKDIKTI) No : 21/E/KPT/2018 (in First Rank) and indexed in Scopus since 2012. Since 2018 (Volume 18), Indonesian Journal of Chemistry publish four issues (numbers) annually (February, May, August and November).
Arjuna Subject : -
Articles 1,956 Documents
 185   186   187   188   189 
Ponceau S Dye Removal Using UV/Chlorine Process: Affecting Factors, COD Removal and Comparison with UV/H2O2 and UV/Persulfate Systems Chatib, Baylassane; Laftani, Yasmine; Boussaoud, Abdelghani; Hachkar, Mohsine
Indonesian Journal of Chemistry Vol 25, No 2 (2025)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.98293

Abstract

The purpose of this work was to examine the degradation of Ponceau S (PS) using the UV/chlorine process under various operating parameters. The temporal evolution of the conductivity and the chemical oxygen demand (COD) of the reaction medium were also investigated. The degradation efficiency of PS by UV/chlorine process was compared to other advanced oxidation processes, such as UV/S2O82− and UV/H2O2 processes. All reaction kinetics exhibited pseudo-first-order kinetics with respect to PS dye and their apparent rate constants were: kapp(UV/H2O2) = 0.0519 min−1 < kapp(UV/S2O82−) = 0.0746 min−1 < kapp(UV/chlorine) = 0.283 min−1. The action of solar irradiation on the PS degradation was appreciably effective. At pH = 4.22 and when [chlorine] = 0.2 mM, PS degradation using UV/chlorine process yielded more than 70% in only 10 min of dye degradation. The presence of inorganic anions showed an inhibition effect on decolorization kinetics for carbonate species compared to that observed for sulfates. The high COD removal efficiency was obtained for UV/persulfate process (73%) in comparison with that obtained for other AOPs.
Using Alkylammonium Salt to Enhance the Adsorption Potential for Ca-Montmorillonite Clay to Remove Color Effluent from Wastewater AL-Mammar, Dunya Edan; Salim, Rasha Tariq; AL-Shammari, Noor Hussein
Indonesian Journal of Chemistry Vol 25, No 2 (2025)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.98468

Abstract

Ca-montmorillonite raw clay (Ca-M) was modified using two different alkylammonium salts, tetramethylammonium iodide (MT) clay, tetrabutylammonium iodide (BT) clay, and used as an adsorbent to remove Biebrich scarlet (BS) dye from wastewater in batch mode. Clay samples were analyzed using an atomic force microscope (AFM), Fourier transform infrared spectroscopy (FTIR), and X-ray diffraction (XRD). The effects of operating parameters affecting the adsorption of BS dye onto clay samples were studied, such as clay weight, adsorption period, initial BS concentration, temperature, and pH. The experimental data were analyzed using Langmuir and Freundlich adsorption isotherm models; the obtained values of correlation coefficient R2 showed that the adsorption followed the Freundlich isotherm model. Thermodynamic data reveal that the adsorption of BS dye onto BT and MT clay samples is exothermic and occurs spontaneously with a decrease in disorder. In contrast, the adsorption of this dye onto raw clay is endothermic and occurs spontaneously with an increase in disorder. The lower values of enthalpy change refer to the adsorption process as physisorption type. The results of kinetics analysis for the adsorption process showed that the pseudo-second-order model was more suitable to represent the adsorption process than the pseudo-first-order model. 
Evaluation of the Morphology and Malachite Green Absorption Capacity of Modified Electrospun Chitosan Nanofibers Nguyen, Hien Thi Thanh; Dang, Thao Thi Ngoc; Ha, Tan Minh; Nguyen, Nhi Tran Yen
Indonesian Journal of Chemistry Vol 25, No 2 (2025)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.98911

Abstract

This article studies the factors affecting the morphology of electrospun chitosan nanofibers modified with polyvinyl alcohol (PVA) and using formed nanofibers for malachite green (MG) adsorption. Chitosan concentrations of 2 and 3 wt.% combined with PVA, the nanofibers are formed with sizes under 75 nm, in contrast to the results of the chitosan solutions formed particles. This result is due to the interaction between the functional group of the polymers that increases entanglement. Machine operating and polymer solution parameters affect the nanofiber morphology. Combining the principal component analysis (PCA) method and physicochemical analysis showed that the factors of chitosan solution, such as concentration, viscosity, and conductivity, mainly influenced the fiber formation process. Besides, the initial test results of CTS 3 wt.%/PVA (1:1) nanofibers adsorbing MG at 10 mg/L concentration exhibited a high adsorption performance (more than 89%), and the amount of absorbed dye (35.83 mg/g) after 120 min at pH 6.8. The obtained results will be worth information for creating chitosan nanofibers by electrospinning the next time and evaluating the MG adsorption capacity of chitosan nanofibers in the presence of PVA.
Study on Zinc-binding Capacity of Featherback (Chitala ornata) Skin Hydrolysate Vo, Tam Dinh Le; Tran, Thinh Ngoc; Vo, Bao Chi; Ma, Hieu Trung; Tran, Hoa Gia; Nguyen, Son Manh; Hoang, Quyen Phuong; Nguyen, Van Thi Tuyet; Nguyen, Mai Thi Ngoc; Nguyen, Thao Huynh Ngoc; Pham, Vy Thuy; Cao, Khang Tran Gia; Pham, Cuong Viet
Indonesian Journal of Chemistry Vol 25, No 2 (2025)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.98948

Abstract

This study aims to valorize featherback (Chitala ornata) skin by-product by generating zinc-binding hydrolysate using Alcalase. Commencing with an effective assessment of hydrolysis conditions on the zinc-binding capacity (ZnBC), the hydrolysate gave the highest ZnBC. Subsequently, the hydrolysate was fractionated using ultrafiltration centrifugal devices, analyzed for its amino acid composition, and examined for the stability of its ZnBC against heat and pH. At the best hydrolysis condition, including the skin:water ratio of 1:4 (w/v), enzyme:substrate (E:S) ratio of 40 U/g protein, pH = 8, temperature of 50 °C, and hydrolysis time of 5 h, the gained hydrolysate exhibited the greatest ZnBC of 30.28 ± 0.83% (2.66 folds lower than that of ethylenediamine tetraacetic acid disodium salt (Na2EDTA)) and contained 8 essential amino acids (making 21.12% total amino acids). Besides, the hydrolysate’s ZnBC could retain above 66% after pH treatment in range 1–11 or thermal treatment at 100 °C for 180 min. The < 1 kDa fraction expressed the highest ZnBC of 38.48 ± 2.96%, 2.09 times lower than Na2EDTA. These findings indicate that hydrolysate and/or its peptide fractions derived from featherback skin could be a natural supplement, especially when producing functional food or nutraceuticals.
Extraction and Characterization of Phenolic Compounds from the Stem Bark of Sonneratia caseolaris (Lythraceae) and Their Potential Antibacterial Activity Harizon, Harizon; Kurnia, Dikdik; Sumiarsa, Dadan; Herlina, Tati; Sinaga, Siska Elisahbet; Shiono, Yoshihito; Azmi, Mohamad Nurul; Supratman, Unang
Indonesian Journal of Chemistry Vol 25, No 2 (2025)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.98976

Abstract

The ethyl acetate fraction separated from the stembark of Sonneratia caseolaris retrieved three phenolic compounds, including quercetin-3-O-glucoside (1), quercetin (2), and 1-O-(2,4-dihydroxybenzoyl)-β-D-glucopyranose (3). For the first time, compounds 1 and 3 were discovered from Sonneratia genus. Data from various spectroscopic techniques, including mass spectroscopy and one- and two-dimensional NMR, were used to identify their chemical structures. Antibacterial activity has also been assessed for all compounds against Staphylococcus aureus ATCC 25175 and Streptococcus mutans ATCC 6538. Compounds 1–3 displayed varying levels of antibacterial activity against S. aureus and S. mutans. However, all compounds exhibited lower efficacy compared to the control, with their minimum inhibitory concentration (MIC) values ranging from 71.25 to greater than 100 µg/mL. This study provides a foundation for optimizing S. caseolaris phenolic compounds as antibacterial agents and highlights the need for comparative studies within the Sonneratia genus to identify potent bioactive candidates through structural modification or synergistic approaches.
The Effect of Ni/AC and Mo/AC Catalyst Arrangements on the Activity and Selectivity for Hydrotreating Palm Cooking Oil into Biojet Fuel Trisunaryanti, Wega; Wijaya, Karna; Saputro, Muhammad Darul Ikhsan
Indonesian Journal of Chemistry Vol 25, No 2 (2025)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.99071

Abstract

This research was done to study the effect of the arrangement of nickel (Ni) and molybdenum (Mo) metals impregnated with activated carbon on the activity and selectivity of the hydrodeoxygenation (HDO) of palm cooking oil into biojet fuel. The catalysts were synthesized by impregnating Ni and Mo metals by dry spray impregnation method with precursor salts nickel(II) nitrate hexahydrate (Ni(NO3)2·6H2O) and ammonium heptamolybdate tetrahydrate ((NH4)6Mo7O24·4H2O) solutions, respectively on the activated carbon. The catalysts were characterized using FTIR, XRD, SAA, SEM-EDX, and NH3-TPD instruments. The catalyst performance was tested using a semi-batch reactor with dual heaters in a one-pot system, atmospheric pressure, and a hydrogen gas flow rate of 20 mL min−1 for the palm cooking oil HDO reaction for 3 h. The obtained liquid products were analyzed using gas chromatography-mass spectrometry (GC-MS). The best catalyst arrangement was the Ni/AC catalyst in a double-layer arrangement, which had 6.25 wt.% metal content, and a surface area of 803.89 m2 g−1 which resulted in 24.75 wt.% yield with 86.93% (fraction 1) and 87.48% (fraction 2) selectivity. This research concluded that catalyst layer arrangement affects the catalytic activity and selectivity in the HDO of palm cooking oil.
Effectiveness of Cobalt-Doped Biochar Derived from Durian Shell for Degradation of Rhodamine B Trinh, Anh Mai Hoang; Le, Thinh Phu; Tran, Khoi Anh; Do, Nga Hoang Nguyen; Le, Kien Anh; Tran, Viet Tan; Le, Phung Kim
Indonesian Journal of Chemistry Vol 25, No 2 (2025)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.99181

Abstract

The global discharge of dye-contaminated effluent into the environment has garnered considerable public attention, and removing the organic pollutants from wastewater is of great importance. Durian shell, a major by-product of Asia countries, is one of the primary causes of environmental issues. To address these current issues, the development of efficient and eco-friendly biomass-derived catalysts that activate advanced oxidation processes (AOP) stands out as a crucial technology for treating organic pollutants in water. In this study, cobalt-doped biochar composites (CoC-n) were synthesized using solvothermal and calcination techniques, with durian shell biomass serving as the precursor material. The obtained CoC-n treated under various calcination temperatures analyzed via SEM, EDS, XRD, and FTIR techniques, which were used for efficient peroxymonosulfate (PMS) activation for up to 92% and 58.98–74.30% RhB (25  and 75 mg/L, respectively) degradation in 30 min. The quenching test performed on the CoC-350/PMS system revealed that RhB degradation involves sulfate (SO4•−), hydroxyl (OH•), and singlet oxygen (1O2) in RhB degradation, with SO4•− and 1O2 being the primary components. The cobalt-doped biochar from durian shells is considered a novel and promising candidate for the eradication of dye-contaminated effluent applications.
Enriching 1,8-Cineole Content in Eucalyptus camaldulensis D. Raw Essential Oil: An Investigation on Optimizing Vacuum Fractional Distillation Process Le, Tien Xuan; Nguyen, Minh Nhat; Le, Trung Minh; Pham, Minh Chau Vu
Indonesian Journal of Chemistry Vol 25, No 2 (2025)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.99211

Abstract

This study addressed the gap in optimizing the 1,8-cineole content in Eucalyptus camaldulensis essential oil, an area with a limited focus in existing literature. While previous research has explored distillation methods for essential oils, this study is the first to systematically investigate the effects of key operational parameters on cineole enhancement using batch vacuum fractional distillation. The optimization process was carried out using a single–factor method focusing on operating pressures (60, 80, 100, 120, 140, and 160 mmHg), column types (Vigreux and Hempel), packing materials (wire mesh, large strings, small strings), and column heights (300, 400, 500, and 600 mm). After each distillation experiment, the essential oil samples were analyzed using GC-MS to quantify the concentration of 1,8-cineole and other components. The best result, achieved at 60 mmHg with a 500 mm Hempel column packed with small metal helixes (2 × 10 mm), increased 1,8-cineole content from 47.9% to 74.6%, with 97% recovery and over 60% yield. These findings highlight the impact of distillation parameters on cineole concentration, marking a 1.5-fold improvement. This optimized distillation process offers an efficient alternative for producing high-bioactivity cineole oil, with potential pharmaceutical and personal care applications, reducing reliance on complex synthesis.
Unrevealing the Impact of Annealing Condition on Catalytic Activity of PtNi Alloy Electrode Towards Oxygen Reduction Reaction Wardhani, Anindya Pramudya; Tanaya, Salwaa; Pravitasari, Retna Deca; Damisih, Damisih; Arti, Dewi Kusuma; Rahayu, Sri; Gumelar, Muhammad Didik; Fidiani, Elok
Indonesian Journal of Chemistry Vol 25, No 2 (2025)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.99297

Abstract

Alloying platinum (Pt) with transition metals such as nickel (Ni) has been an effective approach for reducing Pt loading and enhancing catalytic activities towards the sluggish oxygen reduction reaction (ORR) on the cathode of proton exchange membrane fuel cell (PEMFC). In this work, we advance the fabrication of PtNi alloy electrodes through direct synthesis on the gas diffusion layer (GDL) utilizing wet chemical reduction methods. The catalytic activities and binding interaction between Pt and Ni are optimized through annealing PtNi electrodes at 200 °C under different gas flows of N2 and the mixture of H2/N2 at 5%/95%. The physical characterization using X-ray diffraction (XRD) analysis and scanning electron microscope-energy dispersive X-ray spectroscopy (SEM-EDX) show the significant effect of the annealing environment on the morphology and distribution of the PtNi alloy catalyst on the GDL surface. The optimized electrodes exhibited enhanced ORR mass activity, with values of 8.17 and 18.26 mA mg−1 for PtNi annealed with N2 and N2/H2, respectively, surpassing the benchmark Pt/C (5.25 mA mg−¹). These results underscore the critical role of the annealing environment in optimizing the catalytic performance of PtNi-based electrodes for PEMFC applications, offering insights into more efficient fuel cell technologies.
Solar-Light-Driven N-TiO2-SiO2 Photocatalytic Activity on the Simultaneous Removal of Bisphenol-A and Escherichia coli Le, Minh Vien; Tran, Trung Tan; Hoang, Anh Hoang; Nguyen, Hien Thao; Le, Vu Truong-Son; Luan, Van Hoang; Ngo, Manh Thang
Indonesian Journal of Chemistry Vol 25, No 2 (2025)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.99313

Abstract

N-doped TiO2-SiO2 nanocomposites were synthesized using a facile sol-gel method and characterized through various techniques. Their photocatalytic performance was assessed by degrading BPA (10 mg L−1) and inactivating Escherichia coli (~109 CFU mL−1) under single and dual contaminant conditions using a 26 W solar light simulator. Among the synthesized materials, the N-TiO2-SiO2 nanocomposite with a 10% N:Ti molar ratio (TS5N10) demonstrated the highest photocatalytic activity, achieving 83.9% BPA degradation and complete E. coli disinfection in single contaminant systems after 4 h of irradiation. Notably, TS5N10 exhibited robust performance even in dual-contaminant scenarios involving BPA and E. coli. Mechanistic investigations identified photo-generated holes as the dominant reactive species. The superior performance of TS5N10 was attributed to its nanostructure, high specific surface area, strong light absorption, and reduced photoinduced electron-hole recombination. These results highlight the potential of TS5N10 for practical water treatment applications.

Page 187 of 196 | Total Record : 1956

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