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All Journal Indonesian Journal of Geography Jurnal Pengajaran MIPA Jurnal Bahan Alam Terbarukan CHEMICA Jurnal Teknik Kimia Jurnal technoscientia JURNAL PIJAR Teknosains: Media Informasi Sains dan Teknologi Jurnal Pengajaran Matematika dan Ilmu Pengetahuan Alam Prosiding Pendidikan Sains Jurnal Zeolit Indonesia CHEMPUBLISH JOURNAL IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Indonesian Journal of Chemistry Jurnal Mineral, Energi dan Lingkungan Chemistry Indonesian Journal of Chemical Research Jurnal Jejaring Matematika dan Sains Molluca Journal of Chemistry Education (MJoCE) JURNAL TEKNOLOGI TECHNOSCIENTIA International Journal of Renewable Energy Development
Sri Juari Santosa
Universitas Gadjah Mada
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics

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Synthesis, Characterization, and Application of Magnetite (Fe3O4) Particles as Gold Adsorbent from Simulation Waste Maya Rahmayanti; Sri Juari Santosa; Sutarno Sutarno; Hilmi Hamidi; Lingga Binagara
CHEMICA: Jurnal Teknik Kimia Vol 7, No 2 (2020): Desember 2020
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/chemica.v7i2.17957

Abstract

There have been many magnetic adsorbents in solid phase extraction to recover gold metal known as Magnetic Solid Phase Extraction (MSPE). In this study, magnetite was synthesized using the reverse coprecipitation method with the precipitating agent NaOH. The synthesized material was characterized using a Fourier Transform Infrared (FTIR) spectrophotometer, X-Ray Diffraction (XRD), Vibrating Sample Magnetometer (VSM), and Scanning Electron Microscopy (SEM). The magnetite was then applied as a gold adsorbent from simulated waste (HAuCl4). The effect of acidity on the performance of magnetite as gold adsorbent was studied at various pH ranges. Based on the results of characterization using FTIR, magnetite has been successfully synthesized, marked by the appearance of a typical absorption for Fe-O bonds at a wave number of 578 cm-1. It is amplified with an XRD diffractogram, which gives peaks similar to a standard magnetite diffractogram. The value of the magnetite saturation magnetization was 93.90 emu/g. Based on application studies, [AuCl4] adsorption on magnetite was excellent in the pH range 3-5. The presumed interactions between [AuCl4]- and magnetite were through electrostatic (dipol-ion) interactions, hydrogen bonding, and redox reactions.
Ekstraksi Adsorben Ramah Lingkungan dari Matriks Biologi: Asam Humat Tinja Kuda (AH-TK): Asam Humat Tinja Kuda (AH-TK) Rahmat Basuki; Sri Juari Santosa; Bambang Rusdiarso
CHEMPUBLISH JOURNAL Vol. 2 No. 1 (2017): Chempublish Journal
Publisher : Universitas Jambi, Fakultas Sains dan Teknologi, Program Studi Kimia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (637.815 KB)

Abstract

Telah berhasil dilakukan ekstraksi asam humat dari serbuk tinja kuda kering dan serbuk tinja kuda yang direndam terlebih dahulu dengan disinfektan. Metode ekstraksi dilakukan berdasarkan prosedur Stevenson (1994) di bawah atmosfer udara. Pemurnian dilakukan dengan larutan 0,1 M HCl/0,3 M HF (1:1). Hasil ekstraksi adalah 4 jenis asam humat dari tinja kuda yaitu, asam humat tinja kuda kotor (AHTK), asam humat tinja kuda murni (AHTK-Mur), asam humat tinja kuda desinfektan kotor (AHTK-Dis), dan asam humat tinja kuda desinfektan murni (AHTK-Dis-Mur). Karakterisasi keempat asam humat dari tinja kuda menggunakan spektrofotometer UV-Vis dan FT-IR menunjukkan pola serapan dan puncak-puncak serapan yang mirip dengan asam humat pembanding dari tanah gambut, yaitu asam asam humat tanah gambut (AHTG) dan asam humat tanah gambut murni (AHTG-Mur) yang merupakan pola/serapan karakteristik asam humat berdasarkan Stevenson (1994). Kadar abu AHTG, AHTG-Mur, AHTK, AHTK-Mur, AHTK-Dis, AHTK-Dis-Mur masing-masing sebesar 7,31; 1,20; 15,66; 0,99; 18,02; dan 1,82 % (b/b). Keasaman total AHTK, AHTK-Mur, AHTK-Dis, AHTK-Dis-Mur berturut-turut adalah 400,6; 415,3; 282,5; dan 333,1 cmol/kg. Hasil tersebut menunjukkan AHTK-Mur memiliki keasaman dan kadar abu paling baik.
Comparison Study of PHBA-intercalated Mg/Al-LDH and PHBA-immobilized Mg/Al-LDH: Characterization and Application for [AuCl4]̄ Removal from Solution Lutfi Aditya Hasnowo; Sri Juari Santosa; Bambang Rusdiarso
IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Vol 5, No 3 (2020): October 2020
Publisher : IJFAC (Indonesian Journal of Fundamental and Applied Chemistry)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24845/ijfac.v5.i3.78

Abstract

Synthesis of p-hydroxybenzoic acid (PHBA)-intercalated Mg/Al-LDH and PHBA-immobilized Mg/Al-LDH have been conducted. PHBA-intercalated Mg/Al-LDH hybrid was synthesized by co-assembly process of Mg/Al-LDH nanosheets and PHBA anions. PHBA-immobilized Mg/Al-LDH was prepared by indirect synthesis, where PHBA anions were attached on surface of the Mg/Al-LDH material. Characterization by X-ray Diffraction showed that the PHBA-intercalated Mg/Al-LDH hybrid has the lattice parameter of a=3.02 Å, lattice parameter of c=46.77 Å and basal spacing d003=15.14 Å, where PHBA has been intercalated in interlayer of the hybrid. The PHBA-immobilized Mg/Al-LDH has lattice parameter of a=3.06 Å, lattice parameter of c=23.70 Å and basal spacing d003=7.90 Å. The analytical result confirmed that PHBA has been attached on surface of the hybrid for PHBA-immobilized Mg/Al-LDH. The optimum 10 mL of [AuCl4]‾ 100 mg L-1 removal condition of both hybrids were reached at pH 3. The optimum interaction time of [AuCl4]‾ and PHBA-intercalated Mg/Al-LDH hybrid was 250 minutes, respectively, while that for [AuCl4]‾ and PHBA-immobilized Mg/Al-LDH was 150 minutes. Removal of [AuCl4]‾ by PHBA-intercalated Mg/Al-LDH hybrid followed pseudo second order kinetic, whereas by PHBA-immobilized Mg/Al-LDH followed pseudo first order kinetic. Characterization using stereo photomicroscope confirmed that [AuCl4]‾ could be reduced  to Au  metal by both hybrids.
SYNTHESIS OF POLYEUGENYL OXYACETIC ACID AS A CARRIER TO SEPARATE HEAVY METAL ION Fe (III), Cr(III), Cu(II), Ni(II), Co(II), AND Pb(II) THAT USING SOLVENT EXTRACTION METHOD La Harimu; Sabirin Matsjeh; Dwi Siswanta; Sri Juari Santosa
Indonesian Journal of Chemistry Vol 9, No 2 (2009)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (345.854 KB) | DOI: 10.22146/ijc.21540

Abstract

Polyeugenyl oxyacetic acid has been synthesized from polyeugenol and chloroacetic acid and applied to separate metal Fe(III), Cr(III), Cu(II), Ni(II), Co(II), and Pb(II) using solvent extraction method. pH effect, polyeugenyl oxyacetic acid ion carrier concentration, extraction time, and metal concentration optimized to gain optimum condition. The result of experiment indicated that polyeugenyl oxyacetic acid resulted the yellowed brown synthesis with melting point 125 °C and yield 68.9%. The Characterization of spectroscopy IR attributed by absorption to the area 1735,8 cm -1 as carbonyl extend vibration (C=O) acid and 1H-NMR that was attributed by chemical shift at 4.6 ppm as carboxy proton (CH2-C=0). The metal separation optimum condition gained pH 3-6 for ion Fe(III), pH 5 for ion Cr(III), Ni(II), and Co(II) and pH 6 for ion Cu(II), and Pb(II). Optimum carrier concentraction 5 mL, 10 mL, and 15 mL for ion Fe(III), and ion Cr(III), Ni(II), Co(II), and ion Cu(II), Pb(II) respectively. Extraction time 2.5 h for ion Fe(III), 20 h for ion Cr(III), and 36 h for ion Cu(II), Pb(II), Ni(II), and Co(II). Metal concentration that would extracted correctly (0.75-5 x 10-4 M) for ion Fe(III), (0.75-2.5 x 10-4 M) for ion Cr(III), Ni(II), and Co(II) and (0.75-1 x 10-4 M) for ion Cu(II) and Pb(II). The best polyeugenil oxyacetic acid response to separate ion Fe(III) than other ions with selectivity order Fe(III)> Cr(III)> Cu(II)> Pb(II)> Ni(II)> Co(II).
Studi Kinetika dan Adsorpsi Zat Warna Kation (Metilen Biru) dan Anion (Metil Orange) pada Magnetit Terlapis Asam Humat: Adsorption and Kinetic Studies of Cationic (Methylene Blue) and Anionic (Methyl Orange) Dyes onto Magnetite Coated with Humic Acid Kustomo, Kustomo; Santosa, Sri Juari
Jurnal Jejaring Matematika dan Sains Vol. 1 No. 2 (2019): Edisi Desember 2019
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Palangka Raya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36873/jjms.v1i2.212

Abstract

Sintesis magnetit terlapis asam humat (Fe3O4–HA) telah dilakukan untuk adsorpsi dari dua jenis zat warna, yaitu metilen biru (MB) dan metil orange (MO). Penelitian ini diawali dengan ekstraksi asam humat (HA) yang diperoleh dari hasil isolasi tanah gambut Rawa Pening, Ambarawa, Jawa Tengah dan dilanjutkan dengan sintesis Fe3O4–HA menggunakan metode kopresipitasi dengan agen pengendap NH4OH pada campuran garam FeSO4•7H2O, FeCl3•6H2O dan HA hasil ekstraksi. Fe3O4–HA hasil sintesis kemudian dikarakterisasi dengan spektroskopi FTIR dan difraktogram XRD. Proses adsorpsi dilakukan pada waktu keseimbangan optimum MB dan MO dengan menggunakan kinetika adsorpsi orde satu semu, orde dua semu, dan kinetika Santosa. Hasil penelitian menunjukkan bahwa adsorpsi MB dan MO oleh Fe3O4–HA mengikuti model kinetika adsorpsi orde dua semu dengan nilai konstanta keseimbangan adsorpsi (k) secara berurutan adalah 107304,348 L mol-1 untuk MB, dan 80361,011 L mol-1 untuk MO. Data adsorpsi ini diperoleh pada kondisi pH optimum pada MB dan MO secara berurutan pada pH 7 dan 2, serta tercapai waktu keseimbangan untuk MB dan MO secara berurutan pada 30 dan 15 menit.
Imobilisasi Asam Humat Pada Kitin Dan Aplikasinya Sebagai Adsorben Cr(III) Sehol, Muhamad; Juari Santosa, Sri; Siswanta, Dwi
Indonesian Journal of Chemical Research Vol 5 No 2 (2018): Edisi Bulan Januri (Edition For January)
Publisher : Jurusan Kimia, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2018.5-seh

Abstract

Immobilization of humic acid on chitin has been conducted and applied to the adsorption of Cr(III). The humic acid was isolated using NaOH 0.1 M, while chitin was isolated by deproteination of crab shells by using NaOH 3.5 % (w/v) and followed by demineralization using HCl 1 M. Chitin obtained from ambient-temperature-dried crab shell is named as chitin I, and crab shell washed by HOCl solution and followed by drying at ambient temperature is named chitin II. The total acidity of the humic acid was 230.95 cmol/kg, and it was distributed into the acidity of COOH 168.75 cmol/kg, and phenolic-OH 62.20 cmol/kg. Adsorbent A with chitin I as the main material and adsorbent B with chitin II as the main material, resulted the adsorbed humic acid of 9.25 and 1.68% (w/w), respectively. Adsorption of Cr(III) was maximum at pH 5, with rate of constants orde of chitin II>adsorbent B>adsorbent A>chitin I, i.e. 0.3509; ; 0.2488; 0.1553; 0.0568 minute-1, respectively. The capacity of adsorption was in the orde of chitin I>adsorbent B>chitin II>adsorbent A, i.e. 944.77; 912.53; 895.37; 893.81 mg/g, respectively. The energy of adsorption of Cr(III) of chitin II>chitin I>adsorbent A>adsorbent B, i.e. 22.932; 20,945; 20.312; 19.615 kJ/mol, respectively.
The Effectiveness of Magnetite Modified Gallic Acid Synthesized by Sonochemical Method As AuCl4- Adsorbent-Reductor Rahmayanti, Maya; Santosa, Sri Juari; Sutarno, Sutarno; Paweni, Astuti
Indonesian Journal of Chemical Research Vol 8 No 3 (2021): Edition for January 2021
Publisher : Jurusan Kimia, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2021.8-may

Abstract

In recent years gallic acid has been developed as an AuCl4- adsorbent-reducing agent. In this research, gallic acid was modified with magnetite by sonochemical method (GA-Fe3O4), and its effectiveness as an AuCl4- adsorbent was studied. GA-Fe3O4 was synthesized through one-stage (GA-Fe3O4-SK1) and two-stage (GA-Fe3O4-SK2) methods. The effectiveness of GA-Fe3O4 was studied through optimization studies on pH, time, kinetics, and isotherm adsorption of AuCl4-. The adsorption method used was the batch method in the pH range 2-7. While the kinetics model used was the Lagergren and Ho kinetics model. The adsorption isotherm model used was the Freundlich and Langmuir isotherm model. The results showed that the optimum pH conditions for adsorption of AuCl4- on GA-Fe3O4 occurred at pH 3. Adsorption of AuCl4- on GA-Fe3O4-SK1 and GA-Fe3O4-SK2 both followed the Ho kinetic model, while the adsorption isotherm followed the Freundlich isotherm model with values KF were 0.041 and 0.034 mol/g respectively.
Enhanced Photocatalytic Activity and Magnetic Properties of CoFe2O4/TiO2-Ag/S for Visible Light-Driven Photodegradation of Methylene Blue Kunarti, Eko Sri; Agustiningsih, Dewi; Pambudi, Fajar Inggit; Syoufian, Akhmad; Santosa, Sri Juari
Indonesian Journal of Chemistry Vol 25, No 1 (2025)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.100142

Abstract

Environmental concerns drive the need for effective photocatalysts that can operate under visible light to degrade organic pollutants in wastewater. This study investigated TiO2-based photocatalyst doped with Ag and S to enhance its visible-light response, modified further with CoFe2O4 to introduce magnetic properties, resulting in a composite, CoFe2O4/TiO2-Ag/S. The synthesis was carried out by using cobalt nitrate hexahydrate and ferric nitrate nonahydrate for CoFe2O4 precursor, titanium tetraisopropoxide for TiO2 precursor, and silver nitrate with thiourea for Ag and S dopants. Results from characterization analyses, including FTIR, XRD, UV-vis, SEM-EDX, TEM, and VSM, confirmed the composite structure, with magnetic properties reflected in saturation magnetization of 10.69 emu g−1 and an extended UV-vis absorption edge indicating improved visible light activity. Photocatalytic tests for methylene blue degradation showed the highest performance (92%) with a 1:1 Ag:S ratio under visible light at pH 10 over 120 min, using 20 mg of catalyst in 5 ppm solution. Additionally, the composite demonstrated strong stability, retaining efficiency across six cycles of reuse.
Toward eco-friendly dye-sensitized solar cells: Developing chitosan-based electrolytes with conducting polymers and ionic liquids Hatmanto, Adhi Dwi; Puspitaningrum, Indah; Christina Tefa, Yoan Nikita; Santosa, Sri Juari; Kartini, Indriana
International Journal of Renewable Energy Development Vol 14, No 4 (2025): July 2025
Publisher : Center of Biomass & Renewable Energy (CBIORE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61435/ijred.2025.61085

Abstract

Optimization of chitosan-based gel electrolytes modified with conducting polymers and ionic liquids for dye-sensitized solar cells (DSSC) has been done to improve its electrochemical activity. The effects of iodide salts, 1-propyl-3-methylimidazolium iodide (PMII), and polyaniline incorporation on the electrochemical properties of chitosan-based electrolyte, as well as its performance as a quasi-solid electrolyte in DSSC, were systematically investigated. A study on the effect of different iodide salts on the electrochemical properties of the electrolyte was conducted by employing various iodide salts (lithium iodide, sodium iodide, potassium iodide, or cesium iodide). Electrolytes with various amounts of PMII and polyaniline were also prepared. X-ray diffraction (XRD) and Fourier transform-infrared (FTIR) analysis were conducted to study the effect of iodide salts, PMII, and polyaniline on the change in intermolecular interaction of the chitosan matrix. The ionic conductivity and the redox activity of the chitosan-based electrolyte were respectively evaluated using conductometry and cyclic voltammetry analysis. It is found that the larger cation size of the iodide salts and a higher amount of PMII resulted in both higher intensity of the redox peak current and conductivity of the electrolyte. Those two characteristics increase with the presence of polyaniline, but the low transparency of this polyaniline-based electrolyte lowers the solar cell’s efficiency. The highest performance DSSC utilizing a chitosan/KI-PMII based electrolyte resulted in a Voc of 0.402 V, Jsc of 0.335 mA/cm², fill factor (FF) of 0.432, and an overall power conversion efficiency (PCE) of 0.058%. This efficiency is approximately one-third that of the conventional liquid electrolyte-based DSSC. The optimized chitosan-based electrolyte offers promising performance in replacing the low-stability liquid electrolyte-based DSSC.
Uji Uji toksisitas akut senyawa Poli-monoaliloksi-kaliks[6]arena sebagai antidotum keracunan logam berat Prabawati, Susy Yunita; Jumina, Jumina; Mustofa, Mustofa; Santosa, Sri Juari
Teknosains Vol 19 No 1 (2025): Januari-April
Publisher : Fakultas Sains dan Teknologi Universitas Islam Negeri Alauddin Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24252/teknosains.v19i1.51036

Abstract

Penelitian ini dilakukan untuk mengetahui potensi senyawa poli-monoaliloksi-kaliks[6]arena (PMK[6]H) sebagai antidotum keracunan logam berat dengan melihat ketoksikan akut (LD50) dan menilai gejala klinis akibat pemberian PMK[6]H pada mencit jantan dan betina. Penelitian ini mengikuti rancangan acak lengkap dengan menggunakan mencit jantan dan betina galur Balb/C, sehat, umur 2-3 bulan dengan berat sekitar 20 gram. Percobaan terdiri dari 5 kelompok mencit jantan dan 5 kelompok mencit betina @ 5 ekor (satu kelompok sebagai kontrol). Tiap kelompok dosis uji diberikan PMK[6]H dengan 4 tingkat dosis uji (260; 130; 65; 32,5 mg/kgBB). Dilakukan pengamatan gejala klinis dan jumlah kematian yang terjadi pada hewan uji pada 3 jam pertama pemberian bahan uji hingga 24 jam, kemudian pengamatan dilanjutkan hingga 14 hari untuk menentukan nilai LD50. Hasil penelitian menunjukkan bahwa pemberian dosis tunggal bahan uji tidak memberikan pengaruh terhadap gejala-gejala klinis yang timbul dan tidak menunjukkan gejala-gejala aneh timbulnya keracunan. Pemberian dosis tunggal bahan uji pada mencit jantan dan betina juga tidak menimbulkan kematian pada seluruh kelompok perlakuan. Diperoleh nilai LD50 dari PMK[6]H > 260 mg/kgBB untuk mencit jantan dan betina. Hasil analisis ANOVA terhadap perbedaan berat organ mencit baik jantan maupun betina, secara umum memberikan hasil bahwa tidak terdapat perbedaan yang bermakna dari berbagai berat organ vital dari 5 kelompok perlakuan yang ada. Dengan demikian senyawa PMK[6]H cukup aman untuk digunakan sebagai antidotum keracunan logam berat.
Co-Authors - Jumaeri Abdillah, Guliston Agung Abadi Kiswandono Ahmad Nasir Pulungan Akhmad Syoufian Andung Bayu Sekaranom Bambang Rusdiarso Christina Tefa, Yoan Nikita Dewi Agustiningsih, Dewi Dian Hudawan Santoso Dwi Siswanta Dwi Siswanta Eddy Heraldy Eko Sri Kunarti Fitri Khoerunnisa Girsang, Ermi Hasnowo, Lutfi Aditya Hatmanto, Adhi Dwi Herdiansyah Herdiansyah Hilmi Hamidi Indriana Kartini Jumina Jumina Juniva Laila Sihombing, Juniva Laila Karna Wijaya Kustomo, Kustomo La Harimu Lingga Binagara Maya Rahmayanti Mudasir Mudasir Mustofa Mustofa Nurul Hidayat Aprilita Nurul Ismillayli Nuryono Nuryono Pambudi, Fajar Inggit Paweni, Astuti Pusaka, Semerdanta Puspitaningrum, Indah Rahmat Basuki Rahmayanti, Maya Sabirin Matsjeh Santoso, M.Sc, Dian Hudawan Sehol, Muhamad Sri Sunarsih Susy Yunita Prabawati Sutarno Sutarno Sutarno Sutarno Takashi Hayashita Uripto Trisno Santoso