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All Journal JURNAL KIMIA SAINS DAN APLIKASI Jurnal Ilmu Dasar BERKALA SAINSTEK Bulletin of Chemical Reaction Engineering & Catalysis Warta Pengabdian Indonesian Physical Review Indonesian Chimica Letters Molekul: Jurnal Ilmiah Kimia InSTEM Bulletin of Chemical Reaction Engineering & Catalysis
Yudi Aris Sulistiyo, Yudi Aris
Jurusan Kimia, Fakultas Matematika Dan Ilmu Pengetahuan Alam, Universitas Jember
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Control & Systems Engineering Education Engineering Materials Science & Nanotechnology Mathematics Physics Other

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Synthesis Zeolite Y From Lapindo Mud With Variations Filling Autoclave And Ratio Molar Si/Al Andarini, Novita; Maziyyah, Deys Sya’fatul; Haryati, Tanti; Sulistiyo, Yudi Aris; Suwardiyanto, S.
BERKALA SAINSTEK Vol 11 No 3 (2023)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v11i3.39422

Abstract

Lapindo mud contains Silicate (SiO2), and Aluminum oxide (Al2O3) that can be utilized to synthesize zeolite Y. Zeolite Y was synthesized from Lapindo mud via the smelting and hydrothermal method, respectively. The thermal activation of Lapindo mud was achieved by leaching smelting at 550oC for 2 hours with NaOH to achieve thed desire adding SiO2, NaOH and aging for 48 hours. The effects of various parameters on the synthesis were investigated. The samples were characterized with X-ray Fluorescence (XRF), X-Ray Diffraction (XRD), Fourier Transformation Infrared Spectroscopy (FTIR) and Gas Sorption Analyzer (GSA). Zeolite Y with high crystallinity was synthesized under optimized conditions, such as filling autoclave 90% and a SiO2/ Al2O3 molar ratio of 15.
Two-Stage Hydrothermal Synthesis of TiO₂ Nanotubes with Variation of Precursor Type for Diazinon Photodegradation Haryati, Tanti; Assiddiq, Mustafid A’yun; Suwardiyanto, Suwardiyanto; Andarini, Novita; Sulistiyo, Yudi Aris
Jurnal Kimia Sains dan Aplikasi Vol 28, No 4 (2025): Volume 28 Issue 4 Year 2025
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jksa.28.4.195-199

Abstract

TiO2 is commonly used as a photocatalyst for the photodegradation of harmful chemical compounds, such as diazinon. Its photocatalytic properties can be enhanced by fabricating it into nanotubes. TiO2 nanotube (TNTs) has a large surface area with good photon absorption and electron transport. This study aims to determine the effect of precursor type on the morphology, crystal structure, and photocatalytic activity of the resulting TNTs against diazinon. TNTs synthesis was carried out through a two-stage hydrothermal method using TiO2 micro powder precursors in anatase and rutile phases. The photocatalytic activity of TNTs was tested against diazinon photodegradation. The morphology of TNTs resulting from the first and second hydrothermal processes was fiber-shaped for anatase TNP precursor (TNPa) and rutile TNP precursor (TNPr). TEM characterization showed that the TNT particles were tubular with an outer diameter of 2.27-10.92 nm and an inner diameter of 1.10-4.2 nm. Some impurities, such as sodium titanate and hydrogen titanate, still appear in the diffraction patterns of TNTa and TNTr. The TNTr photocatalyst underwent crystal phase transformation into anatase, which was compared with the JCPDS data. The percentage of degradation for TNTa photocatalyst is slightly greater than TNTr, reaching 85.9% and 82.4%, respectively.
Synthesis of TiO2-Activated Carbon from Coffee Dregs by Hydrothermal Method for Photodegradation of Diazinon Haryati, Tanti; Zakaria, Helmy Ahmad; Sutisna, Sutisna; Suwardiyanto, Suwardiyanto; Sulistiyo, Yudi Aris; Andarini, Novita
Molekul Vol 20 No 1 (2025)
Publisher : Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.jm.2025.20.1.13714

Abstract

ABSTRACT. The photocatalytic activity of TiO₂ can be enhanced by binding it to materials with high adsorption capacity. The synthesis began with the mixture of 5 mL TTIP, 30 mL ethanol, and H₂O 30 mL stirred for 1 hour. Activated carbon made from coffee grounds in varying amounts (5 g, 10 g, and 15 g) was then added to the TTIP solution, and the mixture was stirred for 2 hours. The mixture was then placed in an autoclave, heated at 180°C for 12 hours, dried, and then calcined at 500°C for 3 hours. SEM morphological analysis showed that TiO₂ particles were attached to the surface of the activated carbon, which was further confirmed by EDX data showing the presence of Ti and O elements in the synthesized material. Furthermore, crystallinity and gap analyses demonstrated that the material was exclusively in the anatase phase. The largest surface area, 286.10 m²/g, was observed on titanium dioxide-activated carbon/10 (TiO₂-AC/10), exhibiting a mesoporous structure and microporous features. Photocatalytic tests for diazinon degradation demonstrated that TiO₂-AC/10 exhibited the most significant photocatalytic activity of 65.18%. The composite material's degradation capability diminished by 9-13% from the initial to the third cycle. The residual titanium elements within the composite material maintained stability, suggesting the integrity and durability of TiO₂ particles affixed to the surface of activated carbon. Keywords: TiO2-AC, Coffee Dregs, Diazinon, Photocatalysis, Reusability
OPTIMIZING THE CARBONIZATION TEMPERATURE OF WATER HYACINTH BIOCHAR BY PROXIMATE ANALYSIS USING RESPONSE SURFACE METHODOLOGY Maulina, Wenny; Habibah, Putri Sifa; Arkundato, Artoto; Syarifah, Ratna Dewi; Sulistiyo, Yudi Aris; Sukmawati, Nissa
Indonesian Physical Review Vol. 8 No. 1 (2025)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v8i1.405

Abstract

Water hyacinth is a locally available biomass with the potential to be converted into biochar, serving as a renewable energy source. In this report, response surface methodology (RSM) was employed to optimize the carbonization temperature during the preparation of water hyacinth biochar. Water hyacinth was carbonized in a furnace at varied temperatures (400 °C, 500 °C, 600 °C) for 90 minutes. Characterization of the biochar derived from water hyacinth by proximate analysis was determined, including moisture content, ash content, volatile matter, fixed carbon, and calorific value. The results of the biochar before optimization indicated that moisture content and volatile matter decreased with increasing carbonization temperature, while ash content, fixed carbon, and calorific value increased. After optimization, the proximate analysis of the biochar was determined, with the optimal carbonization temperature found to be 533.54 °C. At this temperature, the optimal moisture content was 6.50%, ash content was 25.53%, volatile matter was 24.80%, and fixed carbon was 43,16%. These findings demonstrate the feasibility of using RSM to optimize the preparation conditions of water hyacinth biochar.
One-Step Hydrothermal Synthesis of TiO2 Nanotubes and Photodegradation Activity towards Diazinon Haryati, Tanti; Diana, Alvina Nur; Sofiyah, Ovy; Nelumbium, Tusiana Putri; Andarini, Novita; Sulistiyo, Yudi Aris; Suwardiyanto, Suwardiyanto
Bulletin of Chemical Reaction Engineering & Catalysis 2023: BCREC Volume 18 Issue 4 Year 2023 (December 2023)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.20056

Abstract

The study aimed to analyze how variations in TiO2/NaOH mole ratio, stirring time, and washing pH affect the formation process of TiO2 nanotubes (TNT) through one-stage hydrothermal. TiO2 micro powder was mixed with 10M NaOH with the variation of TiO2/NaOH mole ratio (0.005:1, 0.015:1, and 0.025:1). The hydrothermal process was then conducted at 130 ℃ in an autoclave for 24 h with stirring time intervals of 10, 15, and 20 minutes/h. The samples underwent 1 M HCl washing to produce diverse pH variations (pH = 2, pH = 3, and pH = 4). Characterization of the synthesized TNT was conducted using SEM, TEM, XRD, SAA, and UV-Vis DRS. After analysis of the micrographs revealed the fiber shape of the particles, it was noted that TNT particle size increased due to smaller mole ratio variation, longer stirring, and lower pH. The synthesized TNT featured a tubular morphology with an inner diameter of 3.30 nm, an outer diameter of 6.15 nm, and a wall thickness of 1.64 nm. The increase in sodium titanate content of the sample results in an increase in surface area. Additionally, small pore size contributes towards an increase in both surface area and total pore size. The best result of the TNT photocatalytic test against diazinon can be observed in the fifth sample with a mole ratio of 0.025:1, stirring time of 20 minutes/h, and washing pH of 3. With an irradiation time of 210 min, diazinon degradation reached 90%. Copyright © 2023 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0). 
Co-Authors Artoto Arkundato Asnawati Asnawati Assiddiq, Mustafid A’yun Bambang Piluharto Denny Trias Utomo, Denny Trias Dewi, Widya Puspita Diana, Alvina Nur Dwi Indarti Endhah Purwandari Furqonul Hakin Al Hadi Habibah, Putri Sifa Kamila, Wilda Lestari, Wiwit Puji Lutfiatun Nadifah Maziyyah, Deys Sya’fatul Nadjib, Muhammad Nelumbium, Tusiana Putri Nida Andriana Novita Andarini Novita Andarini Purwo Handoko, Donatus Setyawan Ratna Ediati Sholehah, Hidayati Nur Mohammad Siti Aisah Sofiyah, Ovy Sukmawati, Nissa Sunnardianto, Gagus Ketut Sutisna Sutisna Suwardiyanto Suwardiyanto Suwardiyanto Suwardiyanto, S. Syarifah, Ratna Dewi Tanti Haryati Wenny Maulina, Wenny Wuryanti Handayani Yeni Maulidah Muflihah Zakaria, Helmy Ahmad Zulfikar Zulfikar Zulfikar, Z.