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All Journal Jurnal Sains dan Seni ITS Jurnal Riset Kimia ALCHEMY Jurnal Penelitian Kimia Indonesian Journal of Chemistry Communications in Science and Technology Chemistry Indonesian Journal of Chemical Research Nusantara Science and Technology Proceedings Automotive Experiences PIKAT Sewagati Bulletin of Chemical Reaction Engineering & Catalysis
Kusumawati, Yuly
Institut Teknologi Sepuluh Nopember
Aerospace Engineering Agriculture, Biological Sciences & Forestry Arts Humanities Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Public Health Social Sciences Other

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Characterization and Kinetic Study of Methylene Blue Photocatalytic on ZnO/ZSM-5 Tehubijuluw, Hellna; Souhoka, Fensia Analda; Kusumawati, Yuly; Prasetyoko, Didik; Subagyo, Riki; Nugraha, Reva Edra; Jalil, Aishah Abdul
Indonesian Journal of Chemical Research Vol 11 No 2 (2023): Edition for September 2023
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598//ijcr.2023.11-hln

Abstract

Photodegradation of organic pollutants depends significantly on the structure of metal oxide-based semiconductor photocatalysts. ZnO/ZSM-5 has shown the potential to significantly improve its photocatalytic efficiency for removing waterborne pollutants. ZnO/ZSM-5 has been reported to be an active catalyst for degrading methylene blue. These methods commonly involve various catalytic reactions, with the Langmuir-Hinshelwood process being used to describe the reaction kinetics. A kinetic study on the photocatalytic degradation of methylene blue using ZnO/ZSM-5 was conducted under UV-LED lamp irradiation. ZnO/ZSM-5 was characterized using XRD, SEM, and N2 adsorption-desorption, and it was prepared via the impregnation method. The interaction between ZnO/ZSM-5 and methylene blue solutions over a period of 30 to 180 minutes was monitored using a UV-Vis spectrophotometer. The photocatalytic degradation of methylene blue followed first-order rate kinetics. The Langmuir-Hinshelwood (L-H) kinetic analysis revealed that the photocatalytic reaction constant (kc) was 4.207 L.mg-1. menit-1, and the Langmuir-Hinshelwood constant (K) was 261.509 L.mg-1.
Ultrafiltration membranes for dye wastewater treatment: Utilizing cellulose acetate and microcrystalline cellulose fillers from Ceiba Pentandra Abdullah, Romario; Astira, Dinia; Zulfiani, Utari; Rahmad Widyanto, Alvin; Rahmawati, Zeni; Gunawan, Triyanda; Kusumawati, Yuly; Hafiz Dzarfan Othman, Mohd; Fansuri, Hamzah
Communications in Science and Technology Vol 9 No 1 (2024)
Publisher : Komunitas Ilmuwan dan Profesional Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21924/cst.9.1.2024.1345

Abstract

Dye hurts the threat of human health problems and environmental pollution. Microcrystalline cellulose (MCC) based membrane is a good material to be used as an dye separation membrane for having the high hydrophilicity of the membrane. It has been successfully isolated from kapok (ceiba pentandra) with characteristic X-ray diffraction patterns and FTIR absorption peaks, which corresponded to the typical peaks of cellulose. The ultrafiltration membrane was made up of a cellulose acetate matrix created using the phase inversion method. Characterization results indicated that the inclusion of MCC derived from kapok led to a reduction in the contact angle from 65 to 52o, and an increase in membrane porosity from 82 to 85%. In the separation of dye, the composite membrane incorporating MCC filler demonstrated superior performance compared to the membrane lacking MCC, manifesting in an elevated water flux from 43 to 84 L/m².h and methylene blue (MB) rejection from 64 to 99%. The use of MCC as a filler in cellulose acetate membranes can enhance the characteristics and performance of the membrane in MB separation.
Pembuatan Biobriket dari Kotoran Sapi di kampung Sanan Blimbing Malang Kusumawati, Yuly; Gunawan, Triyanda; Zetra, Yulfi; Burhan, Perry; Rahmawati, Zeni; Fadlan, Arif; Nugraheni, Zjahra Vianita; Utomo, Wahyu Prasetyo; Fansuri, Hamzah; Widiastuti, Nurul; Putri, Oktavina Kartika
Sewagati Vol 9 No 4 (2025)
Publisher : Pusat Publikasi ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j26139960.v9i4.2397

Abstract

Kampung Sanan merupakan kampung yang mengelola perternakan sapi, sehingga menghasilkan banuak kotoran Sapi. Untuk memanfaatkan kotoran sapi di Kampung Sanan, kami mengajak warga Kampung Sanan mengembangkan pemanfaatan kotoran sapi menjadi biobriket. Biobriket yang dihasilkan dari kampung Sanan ini telah memenuhi standar SNI dan memiliki kualitas yang layak dengan pengujian sifat fisik dan termal. Selain itu, Program ini berpotensi menjadi aplikasi yang berkelanjutan dalam mendukung energi terbarukan berbasis biomassa, sekaligus memberikan dampak positif bagi pengelolaan limbah dan pemenuhan kebutuhan energi lokal.
Structure-Dependent Performance of N-Doped TiO2 Nanowires toward Efficient Solar-Driven Hydrogen Production Attalario, Evan; Rahma, Resha Mutia; Kusumawati, Yuly; Ivansyah, Atthar Luqman; Putri, Yulia Eka; Wellia, Diana Vanda
Bulletin of Chemical Reaction Engineering & Catalysis 2026: BCREC Volume 21 Issue 2 Year 2026 (August 2026)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.20606

Abstract

This research focuses on enhancing hydrogen production via the photocatalytic method using a TiO2 catalyst with nitrogen doping and morphology modification to improve efficiency. Nitrogen-doped TiO2 nanowires (NTN) were successfully hydrothermally grown on titanium foil to produce thin-film photocatalysts for the visible-light-driven production of hydrogen. Nitrogen incorporation induced bandgap narrowing, from 3.18 eV to 2.85 eV, by introducing N 2p states close to the valence band, thereby increasing visible-light absorption. Structural analyses confirmed the formation of lattice strain and oxygen vacancies associated with substitutional doping, while the one-dimensional nanowire architecture enhanced charge transport and reduced carrier recombination pathways. The optimized N–TiO2 NWs demonstrated the highest hydrogen evolution rate of 2.385 µmol/cm2 under 180 minutes of visible-light irradiation, corresponding to a hydrogen evolution rate of 0.795 µmol/cm²/h, without a noble-metal co-catalyst. A strong correlation is established between nitrogen-induced surface electronic modification and the enhancement of nanowire-driven charge separation. This study presents a recyclable and scalable thin-film photocatalyst design suitable for future solar hydrogen production systems. 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).
Synthesis of 2-Hidroxyethyl Ester (2-HEE) and 2-Hydroxypropyl Ester (2-HPE) from Castor Oil as Bioadditives to Improve the Cold Flow Characteristic of Biodiesel Zetra, Yulfi; Batari, Nirmala Puteri; Firdausya, Talitha Fitra; Firdausa, Yunita Alfiyati; Putri, Rizka Berliana; Burhan, R.Y. Perry; Kusumawati, Yuly
Automotive Experiences Vol. 9 No. 1 (2026): Issue in Progress
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/ae.15860

Abstract

The utilization of biodiesel continues to increase along with the development of renewable energy. However, biodiesel tends to exhibit poorer cold flow properties compared to petroleum diesel. In this study, castor oil, a non-edible vegetable oil, was modified into 2-hydroxyethyl ester (2-HEE) and 2-hydroxypropyl ester (2-HPE) to improve the cold flow characteristic of biodiesel. The transesterification of 2-HEE and 2-HPE was carried out using fatty acid methyl esters (FAME) derived from castor oil with ethylene glycol (for 2-HEE) and propylene glycol (for 2-HPE), assisted by a K₂CO₃ catalyst at 150 °C, a mixing speed at 500 rpm, under a vacuum system. The optimum molar ratio of FAME to polyol was 1:10, yielding 69.63% for 2-HEE and 56.84% for 2-HPE. GC–MS analysis showed product abundances of 98.17% for 2-HEE (dominated by 2-hydroxyethyl ricinoleate at 77.4%) and 98.97% for 2-HPE (dominated by 2-hydroxypropyl ricinoleate at 77.9%). The addition of 2% v/v 2-HEE to biodiesel reduced the cloud point by 2.2 °C, the pour point by 3 °C, the flash point by 3 °C, and the density by 0.005 g/cm³, while increasing the kinematic viscosity by 0.21 cSt. Meanwhile, the addition of 2% v/v 2-HPE reduced the cloud point by 3.1 °C, the pour point by 4.3 °C, the flash point by 8 °C, and the density by 0.001 g/cm³, with an increase in kinematic viscosity of only 0.01 cSt. The 2-HPE compound showed superior performance as a bioadditive compared to 2-HEE in improving the cold flow characteristic of biodiesel without significantly altering its physical properties.
Co-Authors Abdul Hamid Abdullah, Romario Aishah Abdul Jalil Anisun Zakiyah Annisa M. Dewi Astira, Dinia Attalario, Evan Atthar Luqman Ivansyah Batari, Nirmala Puteri Dewi, Annisa M. Didik Prasetyoko Erliyanti, Nove Kartika Fadlan, Arif Fadlan, Arif Fahmi Hidayat Fanni Kurnia Wijaya Fansuri, , Hamzah Fensia Analda Souhoka Firdausa, Yunita Alfiyati Firdausya, Talitha Fitra Gunawan, Triyanda Gunawan, Triyanda Habib, Mohammad Hasnan Hafiz Dzarfan Othman, Mohd Hamzah Fansuri Harmami Harmami Hellna Tehubijuluw Hendro Juwono Lely Dwi Astuti Linda Wati Oktavia Liyana Labiba Zulfa Lukman Atmaja Mohd Hafiz Dzarfan Othman Mutasim Billah Nandini , Atika Nanik Ismi Oktavianti Nugraheni, Zjahra Vianita Nur Hadi Nur Izzati Abu Bakar Nurul - Widiastuti Oktavina Kartika Putri Perry Burhan, Perry Putri, Rizka Berliana R.Y. Perry Burhan, R.Y. Perry Rahma, Resha Mutia Rahmad Widyanto, Alvin Rahmawati, Zeni Ratna Ediati Reva Edra Nugraha Riki Subagyo Rizky Arief Shobirin Rosanti, Aulia Dewi Silvana Dwi Nurherdiana Sintha Soraya Santi Subagyo, Riki Syafsir Akhlus Syafsir Akhlus, Syafsir Wahyu B. Widayatno Wahyu Bambang Widayatno Wahyu Prasetyo Utomo Wellia, Diana Vanda Widayatno, Wahyu B. Yogaswara, Rachmad Ramadhan Yulia Eka Putri, Yulia Eka Zetra, Yulfi Zulfiani, Utari