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All Journal JURNAL KIMIA SAINS DAN APLIKASI Jurnal Sains Materi Indonesia Buletin Penelitian Tanaman Rempah dan Obat Journal of Mathematical and Fundamental Sciences Jurnal Kimia dan Kemasan Science and Technology Indonesia Jurnal Penelitian Pendidikan IPA (JPPIPA) Jurnal Kimia Terapan Indonesia Indonesian Journal of Chemistry Acta Chimica Asiana Buletin Penelitian Tanaman Rempah dan Obat Jurnal Riset Teknologi Pencegahan Pencemaran Industri Jurnal Kimia dan Kemasan Makara Journal of Science Environmental and Materials Bulletin of Chemical Reaction Engineering & Catalysis Journal of The Indonesian Society of Integrated Chemistry Rafflesia Journal of Natural and Applied Sciences (RJNAS) Jurnal Sains Materi Indonesia Helium: Journal of Science and Applied Chemistry
Yoki Yulizar
Department Of Chemistry, Faculty Of Mathematics And Natural Sciences, Universitas Indonesia
Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Medicine & Pharmacology Physics Public Health

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Easy Preparation of Zinc Molybdate Photocatalyst and Its Application for Degradation of Methylene Blue Bakri, Ridla; Firmansyah, Rika; Yulizar, Yoki
Jurnal Riset Teknologi Pencegahan Pencemaran Industri Vol. 14 No. 2 (2023): November
Publisher : Balai Besar Standardisasi dan Pelayanan Jasa Pencegahan Pencemaran Industri

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21771/jrtppi.2023.v14.no2.p45-53

Abstract

Photocatalyst is one way that can be done to overcome the problem of dye waste in water. Hazardous chemicals are regularly used in the manufacture of photocatalysts. In this research, ZnMoO4 was prepared by an environmentally friendly and cost-effective synthesis. The functional groups, crystalline structure and morphology of ZnMoO4 were characterised using fourier transform infrared (FTIR), X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), and transmission electron microscopy (TEM). The band gap energy has been studied through UV-Vis diffuse reflectance spectroscopy (UV-Vis DRS). The photocatalytic activity of ZnMoO4 was tested against the organic pollutant methylene blue under visible light irradiation and its degradation products were analyzed with a UV-Vis spectrophotometer at a wavelength of 664 nm. The photocatalytic process of ZnMoO4 has been able to degrade 99% of methylene blue after 80 minutes of irradiation. The excellent photodegradation performance indicates that the transition activity of electron currents from the valence band to the conduction band on ZnMoO4 is going well.
The Incorporation of Hemin Catalysts and Alumina Nanoparticles in a Medium of Spondias mombin Leaf Extract of A Sulfonated Polysulfone-Polyaniline_Alumina Membrane Electrode Assembly for Fuel Cell Technologies Armi Wulanawati; Yoki Yulizar; Sri Mulijani; Fadli Rohman
Bulletin of Chemical Reaction Engineering & Catalysis 2026: BCREC Volume 21 Issue 3 Year 2026 (October 2026)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.20630

Abstract

The development of sustainable Membrane Electrode Assembly (MEA) is crucial for advancing fuel cell technology. This study presents a novel MEA design that incorporates metal oxide nanoparticles synthesized using natural materials into a high-performance membrane and employs a non-platinum catalyst. Specifically, alumina (Al2O3) nanoparticles were synthesized in medium Spondias mombin leaf extract, which served as both a base source and a capping agent. Alumina nanoparticles combined with polyaniline serve as a composite material to enhance the hydrophilicity, structural and thermal stability, power density, and proton conductivity of a sulfonated polysulfone-based composite membrane. Alumina is known as a catalyst support with a large surface area, while polyaniline is a conductive polymer that readily interacts with metal oxides and hemin, which is rich in electrons, exhibits catalytic activity. Based on the characterization of physical and chemical properties, the SPSU-PANI_Al2O3 7.5% composite MEA using a hemin catalyst on the cathode in a fuel cell (DMFC) demonstrated good structural and thermal stability, low methanol permeabilitity (3.37×10-6 cm2/s), and high-power density (90.76 mW/cm2), but low proton conductivity. Furthermore, Electrochemical cell testing of the hemin catalyst, which identified two reduction peaks at 0.48-0.52 V and 1.22 V similar to those of the Pt catalyst at the cathode demonstrates that the hemin catalyst provides comparable cell potential and catalytic activity for the oxygen reduction reaction for fuel cell technologies. Copyright © 2026 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).
Green Synthesis and Formation of Silica Nanoparticles Based on Natural Spondias mombin Leaf Extract for Renewable Energy Materials Armi Wulanawati; Yoki Yulizar; Sri Mulijani
Helium: Journal of Science and Applied Chemistry Vol. 6 No. 1 (2026): Helium: Journal of Science and Applied Chemistry
Publisher : Study Program of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Pakuan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33751/helium.v6i1.37

Abstract

Silica is an abundantly available material, with applications including renewable energy materials (fuel cells). Silica has been produced using natural materials (green synthesis) to form smaller and more stable particles, primarily due to the influence of secondary metabolites such as those contained in the leaf of Spondias mombin, a species of flowering plants from Lannea coromandelica (Houtt.) Merr and the family Anacardiaceae. The characteristics of silica nanoparticles obtained by green synthesis using the Spondias mombin leaf in a water fraction at 0,6 % were identified using XRD, FTIR, PSA, TGA, SEM, and TEM. Based on the XRD pattern and SEM/TEM images, the nanoparticle is amorphous and has a particle size of 20-30 nm, smaller than that of its precursor, which is 37.6 nm. There are Si-OH and Si-O-Si groups in the FTIR spectrum as an indication of the interaction between silica nanoparticles and secondary metabolites, and the zeta potential based on PSA is -45.9 mV. This indicates that silica nanoparticles have good stability and are supported by high thermal stability based on the results of the TGA analysis. This is correlated with its use as a material composite in renewable energy (fuel cells).
Membrane Electrode Assembly Based on Sulfonated Polysulfone-Activated Zeolite Composite Membrane for Fuel Cell Applications Armi Wulanawati; Sri Mulijani; Yoki Yulizar
Jurnal Kimia Sains dan Aplikasi Vol 29, No 1 (2026): Volume 29 Issue 1 Year 2026
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jksa.29.1.39-45

Abstract

The depletion of fuel cell reserves shows the need for alternative energy sources. In this context, fuel cells provide a promising solution, generating power without emissions. The membrane electrode assembly (MEA) in fuel cells is a critical component to maximize combustion efficiency. Therefore, this study aims to develop MEA using a composite membrane based on sulfonated polysulfone-activated zeolite (PSfs-Z). The membrane was obtained by first sulfonating polysulfone (PSf) and then adding activated zeolite. Optimum fuel performance was achieved with the activated zeolite using 3 N HCl. Sulfonation was completed, as demonstrated by a sulfonation degree of 32.63%. The absorption bands of the SO2 group vibration from SO3H of PSfs were identified at a wave number of 1111.00 and 1259.33 cm−1. The successful formation of MEA was confirmed by its morphology, as observed using a scanning electron microscope, with the formation of a catalyst layer and a membrane in the cross-section. The highest proton conductivity and cell potential obtained for PSfs-Z 3 N MEA were 0.01727 S.cm−1 and 330 mV, respectively. This means the membrane electrode assembly based on a sulfonated polysulfone-activated zeolite composite membrane has a higher potential than the
Soda-Anthraquinone-Catalyzed Delignification of Coconut Husk Waste Eka Fitriani Ahmad; Puji Lestari; Katharina Oginawati; Yoki Yulizar; Julinton Sianturi; Muhammad Miftahul Munir; Adawiah Adawiah
Bulletin of Chemical Reaction Engineering & Catalysis 2026: BCREC Volume 21 Issue 1 Year 2026 (April 2026)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.20537

Abstract

This study investigates the role of anthraquinone (AQ) in decomposing coconut husk waste, specifically collected from Banten, to produce pure α-cellulose pulp. The process used sodium hydroxide (NaOH) at 10%, 15%, and 20% concentrations, with 0.1 g of AQ added as a catalyst, and a waste-to-liquid ratio of 1:8 throughout. The goal is to accelerate lignin degradation while protecting cellulose in the material, thereby yielding higher-quality pulp. The Banten coconut husk analysis showed an α-cellulose content of 30.38%. Higher NaOH concentrations reduced pulp yield but increased lignin removal, indicated by lower kappa numbers. AQ addition enhanced lignin removal and preserved cellulose compared to the absence of AQ. The optimal outcome was achieved with 15% NaOH and 0.1 g AQ, balancing lignin removal and cellulose preservation. These findings indicate that anthraquinone can support sustainable pulp production from agricultural waste. Copyright © 2026 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).
SODIUM LAURETH SULFATE (SLS) DECORATED α-PBO NANOCRYSTALS: OPTICAL, STRUCTURE, AND MORPHOLOGY PROPERTIES Tikarahayu Putri; Iwan Syahjoko Saputra; Anjar Hermadi Saputro; Yogi Nopiandi Permana; Yoki Yulizar; Sudirman Sudirman
Jurnal Sains Materi Indonesia Vol. 22 No. 2 (2021)
Publisher : BRIN Publishing (Penerbit BRIN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/jsmi.2021.22.3.6209

Abstract

SODIUM LAURETH SULFATE (SLS) DECORATED α-PbO NANOCRYSTALS: OPTICAL, STRUCTURE, AND MORPHOLOGY PROPERTIES. The α-PbO nanocrystals were successfully decorated using sodium laureth sulfate (SLS) anionic surfactant. The method used is one-pot synthesis approach. The precursor used is lead nitrate (Pb(NO3)2). The UV-Vis spectrophotometer showed the absorption peak of α-PbO nanocrystals was seen at wavelength of 237 nm and an absorbance value of 0.7. The optical properties of PbO nanocrystals can be seen at the bandgap value of 4.2 eV. FT-IR spectroscopy showed the shift of absorption peak at the wavenumber of 1358 cm-1. XRD spectroscopy showed the crystals of PbO at diffraction angles (2θ) of 10-80o: 29.17, 32.54, 37.85, 39.62, 45.16, 46.21, 56.12, and 61.73 with miller indices of (111), (200), (201), (121), (220), (030), (311), and (032), respectively. The crystal size average of PbO was 56.32 nm. The results of PSA and PZC shows the particle size distribution of PbO is 71.5 nm with inter-particle charge of -25 mV. SEM-EDX data shows the PbO nanocrystals have an irregularly spherical with a compounds composition of Pb (83.12%) and O (16.88%). From the data of characterization, it can be concluded the PbO nanocrystals was successfully decorated using the surfactant anionic of sodium laureth sulfate.
BIOREDUCTION AND CHARACTERIZATION OF SILVER NANOPARTICLES FROM OIL PALM EMPTY FRUIT BUNCH Siti Suhartati; Iwan Syahjoko Saputra; Dwinna Rahmi; Yoki Yulizar; Sudirman
Jurnal Sains Materi Indonesia Vol. 21 No. 4 (2020)
Publisher : BRIN Publishing (Penerbit BRIN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/jsmi.2020.21.4.6032

Abstract

BIOREDUCTION AND CHARACTERIZATION OF SILVER NANOPARTICLES FROM OIL PALM EMPTY FRUIT BUNCH (OPEFB). The synthesis of silver nanoparticles was successfully carried out by extracting oil palm empty fruit bunch. The precursor used was silver nitrate (AgNO3) with a concentration of 9x10-4 M and 5 wt% of the oil palm empty fruit bunch extract. OPEFB acted as a capping agent in the synthesis of silver nanoparticles. The bioreduction method Ag+ to Ag0 produced a silver nanoparticle colloid in brown color. The results of the UV-Vis spectrophotometer showed the silver nanoparticles colloids spectrum at a wavelength of 420 nm with an absorbance value of 0.5. FTIR shows the reduction and shift of absorption peak in the hydroxyl functional group (-OH) at wavenumbers of 3323 cm-1 and the presence of absorption peaks at 560 cm-1. While, XRD pattern showed the specific crystallinity peaks of silver nanoparticles at 2θ: 33.24°; 39.98°; 61.23°; dan 79.13° respectively with the face-centered cubic crystal structure (FCC) and crystallite size of 15 nm. PSA analysis showed two specific peaks with an average size distribution silver nanoparticles of 43.5 nm and a PDI value of 0.4. Analysis of TEM shows the average particle size of 20 nm with a spherical particle shape.
Co-Authors Adawiah Adawiah Adi Nurcahyo Aida R. Pudjiastuti Anjar Hermadi Saputro Arief Heru Prianto Armi Wulanawati Asri, Novena Damar Destia Puteri Ananda, Destia Dewi Tristantini Dianursanti Dwinna Rahmi Einaga, Yasuaki Eka Fitriani Ahmad Eka Mardika Handayani Eny Kusrini Fadli Rohman Firmansyah, Rika Foliatini Foliatini Foliatini Foliatini Ghifari, M Alvien Hani, Adinda Muthia Harits Atika Ariyanta Harits Atika Ariyanta Heru Supriyatno Hitoshi Watarai Indah Puspita Sari Indra Gunawan Ivandini Tribidasari Anggraningrum Iwan Syahjoko Saputra Iwan Syahjoko Saputra Iwan Syahjoko Saputra Iwan Syahjoko Saputra Iwan Syahjoko Saputra Iwan Syahjoko Saputra Julinton Sianturi Katharina Oginawati Lestariana, Evie Lingga Abduracman Magun Surya Mas Ayu Elita Hafizah Miftah Fauziah Munir, Muhammad Miftahul Muryanto Muryanto Nahda, Dinda Prastika Nabila Nerny Wahyuningsih Netti Yulia Ningsih NFN Budiawan Ng Sha Shiong Novena Damar Asri Oman Zuas Partomuan Simanjuntak Puji Lestari Raharto, Toto Restasari, Afni Ridla Bakri Rita Arbianti Setiyanto, Cahya Mukti Siti Suhartati Siti Suhartati Siti Suhartati Siti Zulaicha, Annisaa Sitompul, Hamonangan Rekso Diputro Slamet . Sri Mulijani Sudirman Sudirman Sudirman Sudirman Sudirman Sudirman Sudirman Sudirman Sudirman Sudirman Sudirman Sudirman Sudirman Tikarahayu Putri Tresye Utari, Tresye Virleenda M. Setianingrum Wahyuningsih, Nerny Watarai, Hitoshi Yogi Nopiandi Permana Yogi Nopiandi Permana Yosmarina Harahap Yusuf Zaim Hakim