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All Journal CHEMISTRY PROGRESS Jurnal Penelitian Hasil Hutan Alchemy Jurnal Penelitian Kimia Indonesian Journal of Chemical Science Indonesian Journal of Chemistry Communications in Science and Technology CORD Molluca Journal of Chemistry Education (MJoCE) Bulletin of Chemical Reaction Engineering & Catalysis JURNAL REKAYASA KIMIA & LINGKUNGAN
Wega Trisunaryanti
Jurusan Kimia MIPA Universitas Gadjah Mada, Yogyakarta
Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Chemistry Decision Sciences, Operations Research & Management Education Energy Engineering Environmental Science Library & Information Science Materials Science & Nanotechnology

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The Production and Characterization of Carbon Composite from Coconut Shell Charcoal Rampe, Meytij Jeanne; Setiaji, Bambang; Trisunaryanti, Wega; Triyono
International Coconut Community Journal Vol 28 No 1 (2012): CORD
Publisher : International Coconut Community

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (971.592 KB) | DOI: 10.37833/cord.v28i1.109

Abstract

Structure and chemical composition of coconut shell carbon with polyvinyl alcohol (PVA) as the stimulant through the observation of TG-DTA, SEM-EDS, FTIR and XRD had been studied. The process was carried out by calcining coconut shell charcoal at the temperature of 873 and 1023 K under nitrogen flow, then mixed with polyvinyl alcohol (PVA) under composition of 2.5 to 7.5% wt. in water solvent. The development of carbon composite structure was observed by heating the samples in Argon gas of 1673 K, the rate of temperature was 10 K/min in 3 hours. The products were then analyzed by TG-DTA, SEM-EDS, FTIR and XRD. The result showed that the products were in uniform particle size of micrometer dimensions and spherical particles in shape, with average content of C element at 97.44% wt., aromatic character and semi-crystalline structure.
Synthesis, characterization and performance of Ni/mesoporous silica - NH\(_2\)/mesoporous silica and Ni-NH\(_2\)/mesoporous silica as bifunctional catalyst in one step conversion of waste palm oil to biodiesel Fitria, Anissa; Trisunaryanti, Wega; Triyono; Santoso, Iman
Communications in Science and Technology Vol 9 No 2 (2024)
Publisher : Komunitas Ilmuwan dan Profesional Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21924/cst.9.2.2024.1483

Abstract

Sidoarjo mud is a natural material resulted from an unusual natural phenomenon and is rich in silica contents. So far, no studies have been reported about mesoporous silica from Sidoarjo Mud, which is a supported catalyst for one-step conversion to biodiesel. This study aims to explore synthesis, characterization, and applications to demonstrate the heightened activity and selectivity in the esterification- transesterification of waste palm oil into biodiesel, utilizing a one-step method aligned with the principles of green chemistry using two bifunctional catalysts (Ni/MS - NH2/MS and Ni-NH2/MS). The bifunctional catalysts were prepared by means of hydrothermal, wet impregnation, and grafting methods. The highest biodiesel yield (78.77%) was achieved under the condition of 65 °C, 3 h, methanol to oil ratio 21 : 1, and 3wt% of Ni/MS - NH2/MS as the catalyst. The catalyst was able to yield a conversion level as good as ~72% in the 3rd cycle after regeneration. The research demonstrates the industrial relevance of the catalyst, offering a sustainable solution for biodiesel production and waste management.
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.
EFFECT OF SOAKING AND HYDROLYSIS TIME VARIATIONS ON GELATIN CHARACTERISTICS FROM COW BONES Pattiasina, Priska Marisa; Trisunaryanti, Wega; Wijaya, Karna
Molluca Journal of Chemistry Education (MJoCE) Vol 15 No 1 (2025): MJoCe
Publisher : Program Studi Pendidikan Kimia, FKIP, Universitas Pattimura (Chemistry Education Study Program, Faculty of Teacher Training and Educational Sciences, Pattimura University)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/MJoCEvol15iss1pp27-33

Abstract

Gelatin extraction from cow bones has been conducted with variations in both acid and alkaline soaking. The gelatin extraction process from cow bones consists of two steps: soaking the cow bones and collagen hydrolysis. During the soaking step, continuous soaking was performed, beginning with soaking in a 4% NaOH alkaline solution, followed by acid soaking using a 1.2% citric acid solution, and further acid soaking with 4% HCl, with variations in soaking times of 1 hour, 12 hours, and 24 hours. The soaked cow bones were then hydrolyzed at temperatures of 60°C and 80°C for 5 hours. The resulting gelatin was characterized using FTIR and SDS-PAGE techniques. The best-characterized gelatin, with a band thickness in the molecular weight range of about 120 kDa, confirmed as the α chain, was obtained from soaking for 24 hours and hydrolyzing at 80°C.
A Green and Sustainable Approach for Converting Laboratory Latex Glove Waste into Liquid Fuel via Microwave-assisted Pyrolysis Wangsa, Wangsa; Saviola, Aldino Javier; Hauli, Latifah; Trisunaryanti, Wega; Chandra, Patrik; Fitria, Riska Astin; Mahayuwati, Puspa Nindro; Wijaya, Karna
Bulletin of Chemical Reaction Engineering & Catalysis 2025: BCREC Volume 20 Issue 3 Year 2025 (October 2025)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.20429

Abstract

The extensive use of chemical laboratories for experimental and research activities has resulted in the substantial accumulation of latex glove waste, a widely used form of personal protective equipment (PPE). This study presents a novel and sustainable approach for converting laboratory latex glove waste into liquid fuel using microwave-assisted pyrolysis (MAP), which aligns with the principles of green chemistry. Under optimal conditions, including a microwave power of 800 W and an irradiation time of 30 min, the process achieved a liquid product yield of 52.58 wt%, with 41.86 wt% consisting of gasoline-range hydrocarbons (C₅–C₁₂). The primary compound identified in the liquid product was D-limonene (C₁₀H₁₆), a valuable monocyclic terpene. Compared to conventional pyrolysis conducted in a semi-batch reactor, the MAP process exhibited superior performance in terms of liquid yield, gasoline-range hydrocarbon content, total hydrocarbon composition, and calorific value. This innovative waste-to-fuel conversion method demonstrates the strong potential of MAP as an efficient and environmentally responsible strategy for waste valorization and resource recovery. Copyright © 2025 by Authors, Published by BCREC Publishing Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).
Reaction Kinetics of Waste Cooking Oil Hydrocracking into Biofuel Using Ni-Impregnated Mesoporous Silica Catalyst Salamah, Siti; Trisunaryanti, Wega; Kartini, Indriyana; Purwono, Suryo
Bulletin of Chemical Reaction Engineering & Catalysis 2025: BCREC Volume 20 Issue 3 Year 2025 (October 2025)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.20399

Abstract

The growing demand for energy and the scarcity of fossil fuel resources have driven research into alternative fuels, one of which being the conversion of waste cooking oil into biofuel through hydrocracking. This study investigates the reaction kinetics of waste cooking oil hydrocracking using a Ni-impregnated mesoporous silica catalyst. The process was conducted at 450 °C with a hydrogen gas flow to produce products such as green naphtha, green gasoline, and green diesel. The proposed reaction kinetics model was the pseudo-first order, solved using differential and integral methods. The results showed that the first-order reaction provided a more representative outcome, with a reaction rate constant (k’) of 0.276 h⁻¹ at 450 °C. Additionally, the Arrhenius kinetic model revealed an activation energy of 37.8748 kJ/mol for this process. Thus, this study demonstrates a significant potential of using mesoporous silica catalysts in waste cooking oil hydrocracking to produce environmentally friendly and economically viable biofuels. Copyright © 2025 by Authors, Published by BCREC Publishing Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).
Impregnated Zeolite as Catalyst in Esterification Treatment from High Free Fatty Acids Palm Oil Mill Effluent Nugraheni, Ika Kusuma; Nuryati, Nuryati; Persada, Anggun Angkasa Bela; Triyono, Triyono; Trisunaryanti, Wega
Jurnal Rekayasa Kimia & Lingkungan Vol 16, No 1 (2021): Jurnal Rekayasa Kimia & Lingkungan (June, 2021)
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v16i2.16378

Abstract

Although Palm Oil Mill Effluent (POME) can be used as a raw material for biodiesel production, the POME contains an excessive amount of Free Fatty Acids (FFA), necessitating a preliminary process and esterification. POME is degummed using phosphate acid and bleached with carbon active. Additionally, this study used KOH-impregnated zeolite to reduce FFA. The purpose of this study is to determine the effect of adding impregnated zeolite on esterification. POME was heated to 600C for 30 minutes, then degumming with 3 % of phosphate acid for 30 minutes, followed by bleaching with carbon active with a comparison ratio of 8:3 at 1000C for 1 hour, and finally, esterification with 3 percent impregnated zeolite from the POME weight at 600C for 4 hours. The analysis was conducted using titration methods to determine the FFA of each esterification. The data will be compared between zeolite and non-zeolite degumming, bleaching, and esterification. The results indicated that the most effective method for reducing FFA was degumming, bleaching, and esterification with zeolite.
Co-Authors Abd. Rasyid Syamsuri Ady Mara, Ady Aminuyati Bambang Setiaji Budiyansah, Amsal Chairil Anwar Chandra, Patrik Dian Maruto Widjonarko Endang Tri Wahyuni Fatmawati, Dyah Ayu Fitria, Anissa Fitria, Riska Astin Haryo Satriya Oktaviano Hauli, Latifah I F Nurcahyo, I F I. D. K. Anom Indriana Kartini Karna Wijaya Kartini, Indriyana Khoirina Dwi Nugrahaningtyas Lisna Efiyanti Mahayuwati, Puspa Nindro Meytij Jeanne Rampe Nugraheni, Ika Kusuma Nuryati Nuryati Nuryono Nuryono Pattiasina, Priska Marisa Persada, Anggun Angkasa Bela Rahayu, Endah Fitriani Rodiansono Rodiansono Rodiansono Saputro, Muhammad Darul Ikhsan Saviola, Aldino Javier Siti Salamah Suryo Purwono Tazkia, Aulia Meylida Triyono Triyono . Triyono Triyono Uswatul Chasanah, Uswatul Wangsa, Wangsa