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All Journal Reaktor JURNAL KIMIA SAINS DAN APLIKASI Jurnal Ilmu Dasar BERKALA SAINSTEK Alchemy Jurnal Penelitian Kimia UNEJ e-Proceeding ALCHEMY Jurnal Penelitian Kimia Indonesian Chimica Letters Molekul: Jurnal Ilmiah Kimia InSTEM Bulletin of Chemical Reaction Engineering & Catalysis
Tanti Haryati
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 Energy Engineering Environmental Science Materials Science & Nanotechnology Mathematics Physics Other

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Pengaruh Pelarut dan Ukuran Template Terhadap Struktur TiO2 D. C, Hermawan; Haryati, Tanti; E., Supriyanto.
BERKALA SAINSTEK Vol 5 No 2 (2017)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v5i2.5554

Abstract

Sintesis titanium oksida (TiO2) telah dilakukan pada penelitian ini menggunakan metode sol gel. Titanium isopropoksida (TTIP) digunakan sebagai prekursor. Pelarut yang digunakan antara lain metanol, etanol, dan 2-propanol. Sintesis TiO 2 juga memakai polietilen glikol (PEG) sebagai molekul template. Variasi yang digunakan adalah variasi pelarut dan berat molekul template. Hasil analisa XRD untuk variasi pelarut menunjukkan bahwa pelarut metanol menghasilkan ukuran kristal yang lebih kecil dibandingkan dengan etanol dan 2-propanol yaitu sebesar 137,50 nm.Kata Kunci: Pelarut, Polietilen glikol, Sol Gel, TiO2.
Pemurnian Silikon (Si) Hasil Reduksi Silika dari Fly Ash Batubara Andarini, Novita; Haryati, Tanti; Yulianti, Rika
BERKALA SAINSTEK Vol 6 No 1 (2018)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v6i1.7933

Abstract

Fly ash merupakan limbah hasil pembakaran batubara yang mengandung beberapa senyawa kimia yang dapat dimanfaatkan.. Salah satu senyawa kimia dengan persentase tinggi di dalam fly ash adalah senyawa silika (SiO2). Penelitian ini bertujuan untuk mendapatkan silikon murni hasil dari reduksi silika dari fly ash batubara. Silika diperoleh dengan metode ekstraksi yaitu dengan menggunakan NaOH 3M dan HCl 1M, dilanjutkan dengan pemurnian silika menggunakan HCl 37%. Silika murni yang diperoleh kemudian direduksi menggunakan metode metalotermal dengan logam magnesium. Komposisi massa silika dan magnesium yang digunakan dioptimasi dengan empat variasi perbandingan massa silika:magnesium masing- masing 1:0,8 ; 1:1,5; 1:2 dan 1:2,5. Produk optimum hasil dari proses reduksi kemudian dimurnikan menggunakan 150mL HCl 2M lalu dipanaskan pada suhu 80oC sambil distirer selama 3 jam. Hasil analisa XRF (X-Ray fluorescence) menunjukkan persentase kadar silika yang diperoleh dari proses ekstraksi yaitu 79,72% dan meningkat kadar kemurniannya menjadi 93,76% setelah dilakukan pemurnian. Karakterisasi produk dari reaksi reduksi silika oleh magnesium menggunakan XRD dengan program software Match 3 secara keseluruhan terhadap semua variasi massa silika:magnesium menunjukkan bahwa silikon yang dihasilkan hanya diperoleh pada variasi silika:magnesium 1:0,8 yaitu sebanyak 4,8%. Hal ini ditunjukkan dengan munculnya puncak 2 theta pada titik 42.77 o, 48.43o dan 78.39o. Kemurnian silikon kemudian meningkat menjadi 5,6% setelah dilakukan pemurnian.Kata Kunci: fly ash, pemurnian, reduksi, silika, silikon
Sintesis Lapis Tipis Zn1-XNiXO sebagai Material Fotokatalis Pendegradasi Pewarna Tekstil Roziqin, Achmad Zainur; Haryati, Tanti; Andarini, Novita
BERKALA SAINSTEK Vol 6 No 2 (2018)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v6i2.9228

Abstract

Limbah cair zat warna dapat didegradasi dengan menggunakan teknik fotodegradasi katalitik menggunakan material semikonduktor dengan bantuan paparan sinar ultraviolet (UV). Salah satu material semikonduktor yang digunakan untuk proses pendegradasian adalah zink oksida (ZnO). Metode sintesis lapis tipis Zn1-xNixO adalah sistem deposisi larutan. Pengaruh dari variasi jumlah penambahan ion dopan Ni 2+ pada sintesis lapis tipis Zn1-xNixO terhadap struktur dan komposisi dikarakterisasi menggunakan X-Ray Diffraction (XRD) dan X-Ray Fluoresence (XRF). Kinerja dari lapis tipis Zn1-xNixO sebagai fotokatalitik dipelajari melalui % degradasi limbah zat cair dalam hal ini menggunakan Procion Red MX8-B. Berdasarkan hasil karakterisasi diperoleh hasil semakin tinggi persentase ion dopan Ni2+ maka semakin tinggi kristanilitas dan semakin kecil ukuran kristal dari lapis tipis Zn1-xNixO. Begitu pula pada aktivitas fotokatalisnya semakin tinggi persentase ion dopan Ni2+ maka semakin tinggi pula persen degradasinya. Aktivitas fotokatalis optimum didapatkan pada lapis tipis dengan komposisi 5% Ni yaitu sebesar 34.5%. Kata Kunci: Lapis tipis Zn1-xNixO, fotodegradasi katalitik, limbah cair zat warna.
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%.
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
Extraction of Aluminium (Al) Metal from Coal Fly Ash of PLTU-Paiton with NaOH Solvent Puspa, Aranca Nindya; Haryati, Tanti; Andarini, Novita
Indonesian Chimica Letters Vol. 2 No. 2 (2023)
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.v2i2.5616

Abstract

Fly ash, a solid waste product from the coal combustion process at the Paiton PLTU, contains 14.52-23.78% alumina (Al2O3). This can be extracted using NaOH for further utilization. The Al(OH)3 precipitate was obtained using a 4 M HCl solution with pH variations of 6 and 6.5. Meanwhile, Al metal was obtained using a reduction temperature variation of 600-700°C with an interval of 50°C using Mg metal reductant for 2.5 hours. The aluminum metal obtained was subjected to qualitative analysis by UV-Vis spectrophotometer and quantitative analysis by XRF and AAS. The Al(OH)3 precipitate obtained at a pH of 6.001 weighed 1.581 grams, with a yield of 61.83%, while at a pH of 6.500 it weighed 1.688 grams, with a yield of 66.02%. Applying a specific reagent for Al metal, alizarin, to qualitative analysis resulted in a maximum wavelength of 495 nm. A quantitative analysis was conducted utilizing the atomic absorption spectrophotometer (AAS) at a wavelength of 309.3 nm. The alumina content in fly ash was determined to be 14.52%, with an Al metal yield of 8.67% at a pH of 6 and 9.01% at a pH of 6.5, at an optimal reduction temperature of 650°C.
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 AA Sudharmawan, AA Agus Wedi Pratama Almu’minin, Achmad Sholikhudin Assiddiq, Mustafid A’yun Bambang Piluharto D. C, Hermawan Dewi, Widya Puspita Diana, Alvina Nur Dwi Indarti E., Supriyanto. Fachry Abda El Rahman Furqonul Hakin Al Hadi HARDIAN SUSILO ADDY I Nyoman Adi Winata Ika Oktavianawati Imam Syafi’i Kamila, Wilda Kiki Puji Setianingrum Lutfia, Zuhrotul Maziyyah, Deys Sya’fatul Mellisa Ika Febrianti Nasution, Annio Indah Lestari Nelumbium, Tusiana Putri Novita Andarini Novita Andarini Nursiah Nursiah, Nursiah Nursiah, N. Puspa, Aranca Nindya R. Indahsari Ramadhani, Ferlia Suci Ria Sherly Farida Rika Yulianti, Rika Roziqin, Achmad Zainur Sholehah, Hidayati Nur Mohammad Siswoyo Siswoyo Siti Mardhiyah Sofiyah, Ovy Sunnardianto, Gagus Ketut Sutisna Sutisna Suwardiyanto Suwardiyanto Suwardiyanto Suwardiyanto, S. Syamsul Arifin Tri Mulyono Wawan Badrianto Wawan Badrianto, Wawan Yeni Maulidah Muflihah Yudi Aris Sulistiyo, Yudi Aris Zakaria, Helmy Ahmad