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Suwardiyanto
Department Of Chemistry, Faculty Of Mathematics And Natural Science, University Of Jember, Jember 68121|University Of Jember|Indonesia
Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Materials Science & Nanotechnology Mathematics Physics

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Sintesis Kalsium Aluminat (CaAl2O4) dengan Variasi Asam Sitrat dan Suhu Kalsinasi Menggunakan Metode Sol-Gel sebagai Katalis Biodiesel Zulaicha, Siti; Suwardiyanto, Suwardiyanto; Andarini, Novita
BERKALA SAINSTEK Vol 8 No 2 (2020)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v8i2.15066

Abstract

Kalsium aluminat (CaAl2O4) disintesis menggunakan metode sol-gel sebagai katalis biodiesel. Jumlah mol asam sitrat dan suhu kalsinasi berpengaruh terhadap fasa material yang dihasilkan. Perbandingan mol (Ca2+ dan Al3+) : asam sitrat yang digunakan yaitu 1:1; 1:2; dan 1:3 mol, sedangkan variasi suhu kalsinasinya yaitu 700, 800, dan 900 oC. Material hasil sintesis dikarakterisasi dengan XRD untuk mengetahui fasa yang terbentuk, dan diolah lebih lanjut dengan program FindIt dan Match! untuk mengetahui komposisi phase hasil sintesis. Hasil XRD menunjukkan peningkatan kristalinitas dengan kenaikan suhu kalsinasi dan konsentrasi CaAl2O4 meningkat dengan kenaikan jumlah mol asam sitrat yang digunakan. Material katalis yang disintesis pada perbandingan 1:3 mol yang dikalsinasi pada suhu 900 oC diuji dalam reaksi transesterifikasi untuk mengetahui aktivitasnya sebagai katalis biodiesel. Metil ester hasil reaksi transesterifikasi dianalisa GC-MS untuk mengetahui komposisi FAME dan menentukan konversinya. Katalis ini mampu mengkonversi 33,78 % minyak sawit menjadi metil esternya .
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.
Effectiveness of Gold Extraction with Thiourea Solution from Gold Rocks in Mount Tumpang Pitu Pasanggaran Banyuwangi Andarini, Novita; Ramadhani, Ferlia Suci; Haryati, Tanti; Suwardiyanto
Indonesian Chimica Letters Vol. 3 No. 2 (2024)
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, University of Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/icl.v3i2.4107

Abstract

This research aims to determine the effect of adding an oxidizing solution in the gold extraction process using thiourea solution. The oxidizing agent used in thiourea leaching solution is FeCl3. Variations of additional volume of oxidizing solution are 0 mL, 10 mL, 20 mL, 30 mL, and 40 mL. Based on the results obtained, the addition of 30 mL oxidant FeCl3 can get optimal results. The thiourea leaching solution can extract gold as much as 46.7%.
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
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). 
Response of mineral formulation towards different growth phases of arabica coffee in lowland Wulanjari, Distiana; Wijaya, Ketut Anom; Rosyady, Muhammad Ghufron; Suwardiyanto, Suwardiyanto; Meliala, Susan Barbara Patricia Sembiring; Setiyono, Setiyono; Farisi, Oria Alit
Jurnal Ilmu Pertanian Vol 9, No 1 (2024): April
Publisher : Faculty of Agriculture, Universitas Gadjah Mada jointly with PISPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ipas.76043

Abstract

Arabica coffee cultivation is limited by altitude, which affects its production. Some farmers in Jember Regency are innovating to grow arabica coffee in the lowland, but the potential for leaf rust disease is quite high. Plant natural resistance can be enhanced by adding minerals formulation (containing silica, iodine, and calcium). This research aimed to determine which phase is more effective for applying mineral formulation that induces plant resistance. The formulation was tested on arabica coffee plants grown at the lowland (460 masl) in Jember Regency on 12 years old (y.o) mature and 1 y.o immature plants. One formulation was dissolved in 14 L of water and applied by foliar feeding. The effect was analyzed using two-way T-test of two samples assuming unequal variances at 95% confidence level to determine the differences. The analysis showed that the plants supplemented with the formulation could increase the variables that supported the natural resistance of plants (both mechanically and through the production of chemical compounds), such as polyphenol content, flavonoids, antioxidant activity, total dissolved protein, vitamin C, reducing sugar, lignin, cellulose, hemicellulose, and iodine content in the plant. The response of the formulation application showed that the most resistance variables was better in 1 y.o immature plants than in 12 y.o mature plants. The application of mineral formulation in immature phase will have a better impact on increasing natural resistance, and it has the potential to be used as a supplement for arabica coffee plants cultivated in the lowland.
Extraction of Iron (Fe) From Fly Ash Using Citric Acid and Oxalic Acid as Lixiviant Suwardiyanto; Waladatus Sholikhaha; Dyah Hayuning Tyasa; Yudi Aris Sulistiyo
Indonesian Chimica Letters Vol. 4 No. 2 (2025)
Publisher : Department of Chemistry, FMIPA, UNEJ

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/icl.v4i2.60001

Abstract

Reduction of iron (Fe) content within fly ash has been conducted by solid-liquid extraction using oxalic acid and citric acid as lixiviant. Separation of iron compounds using magnet and acid treatment have been performed prior to the extraction to decrease the iron concentration within the fly ash. Iron within the fly ash was extracted in several pH condition and several Fe/lixiviant molar ratio to evaluate their effect on the extraction. The extraction performance was evaluated toward residual iron concentration in the fly ash and amount of fly ash after extraction process. Residual iron was determined by spectrometer Uv-Vis using o-phenanthroline whereas the amount of fly ash was determined gravimetrically. Extraction using citric acid at pH of 6 and molar ratio of 1 : 4 has highest iron removal from fly ash whereas the highest fly ash residual was obtained by extraction at pH of 7 molar ratio of 1 : 2. The highest performance of oxalic acid as iron lixiviant was obtained at pH of 6 and molar ratio of 1 : 6 and the highest fly ash residual at pH of 6 and molar ratio of 1 : 3.
Optimization of Cyanidation Parameters in the Merrill-Crowe Method for Copper Recovery from Electroplating Wastewater Afrianti, Lia; Haryati, Tanti; Mintadi, Mukh; Asnawati, Asnawati; Oktavianawati, Ika; Andarini, Novita; Sulistiyo, Yudi Aris; Suwardiyanto, Suwardiyanto
Indonesian Chimica Letters Vol. 5 No. 1 (2026)
Publisher : Department of Chemistry, FMIPA, UNEJ

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/icl.v5i1.60006

Abstract

Electroplating wastewater contains heavy metals (copper, chromium, zinc, and nickel) at concentrations that frequently exceed safe discharge limits, posing serious risks to aquatic ecosystems. This study examines whether the Merrill–Crowe process, conventionally used for gold and silver recovery, can be adapted to recover copper from industrial electroplating effluent. The wastewater tested carried an initial copper concentration of 235.7 ppm. Cyanidation conditions were optimized by varying pH (7-11) and contact time (5-25 hours) to generate copper–cyanide complexes, which were subsequently precipitated with zinc powder. Complex formation was monitored by UV-Vis spectrophotometry; copper concentrations were quantified by atomic absorption spectrophotometry. Optimal conditions were pH 8 and 20 hours of contact time. Under these parameters, copper recovery reached 58.5% from electroplating wastewater and 43.5% from a standard reference solution. The higher efficiency in the wastewater sample reflects the presence of pre-formed copper–cyanide complexes, which accelerated both cyanidation and cementation. These results suggest the Merrill–Crowe process is a viable, low-complexity recovery strategy, one that not only reduces copper discharge but returns it in elemental form with potential economic value.
Two-Stage Hydrothermal Synthesis of TiO₂ Nanotubes with Variation of Precursor Type for Diazinon Photodegradation Tanti Haryati; Mustafid A’yun Assiddiq; Suwardiyanto Suwardiyanto; Novita Andarini; Yudi Aris Sulistiyo
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.
Co-Authors Afrianti, Lia Ashanal Holikin Asnawati Asnawati Dewi, Widya Puspita Diana, Alvina Nur Djulia Onggo Dyah Hayuning Tyasa Edy Supriyanto Farisi, Oria Alit Furqonul Hakin Al Hadi I Nyoman Adi Winata Ika Oktavianawati Ismunandar Ismunandar Kamila, Wilda Ketut Anom Wijaya Maziyyah, Deys Sya’fatul Meliala, Susan Barbara Patricia Sembiring Mintadi, Mukh Mukh Mintadi Mustafid A’yun Assiddiq Nelumbium, Tusiana Putri Novita Andarini Ramadhani, Ferlia Suci Rizqa Puspitarini Rosyady, Muhammad Ghufron Setiyono Setiyono Sholehah, Hidayati Nur Mohammad Sofiyah, Ovy Sunnardianto, Gagus Ketut Sutisna Sutisna Tanti Haryati Waladatus Sholikhaha Wulanjari, Distiana Yudi Aris Sulisitiyo Yudi Aris Sulistiyo Zakaria, Helmy Ahmad Zulaicha, Siti