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All Journal JURNAL KIMIA SAINS DAN APLIKASI PROSIDING SEMINAR KIMIA KOVALEN: Jurnal Riset Kimia Jurnal Kimia Mulawarman JURNAL ATOMIK JKPK (Jurnal Kimia dan Pendidikan Kimia) Jurnal Abdimas Mahakam Bulletin of Chemical Reaction Engineering & Catalysis
Soerja Koesnarpadi
Jurusan Kimia Fakultas Matematika Dan Ilmu Pengetahuan Alam Universitas Mulawarman
Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Economics, Econometrics & Finance Energy Engineering Environmental Science Law, Crime, Criminology & Criminal Justice Public Health Social Sciences

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KOMPOSISI OPTIMUM PEMBUATAN ADSORBEN KITOSAN-Fe3O4 (K-Fe3O4) DAN KARAKTERISASINYA DENGAN MENGGUNAKAN FT-IR DAN XRD Munandar, Aris; Alimuddin, Alimuddin; Liana Sari, Ika Yekti; Koesnarpadi, Soerja
PROSIDING SEMINAR KIMIA SEMINAR NASIONAL KIMIA 2019
Publisher : PROSIDING SEMINAR KIMIA

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Abstract

Telah dilakukan sintesis adsorben K-Fe3O4 dari magnetit (Fe3O4) yang sebelumnya dibuat dari ferri amonium sulfat (III) dan ferro amonium sulfat (II) dengan perbandingan 3:1. Kemudian Fe3O4 dimodifikasi dengan kitosan yang dimanfaatkan untuk mengadsorpsi ion logam Pb2+. Adsorben diatur dengan perbandingan komposisi magnetit dan kitosan 1:1; 2:1 dan 1:2. Karakteristik adsorben K-Fe3O4 dan interaksi adsorben terhadap ion Pb2+ diketahui berdasarkan data Fourier Transform Infared (FTIR) dan X-ray Powder Diffraction (XRD). Untuk hasil FT-IR, K-Fe3O4 mengalami perubahan peak pada panjang gelombang 354,9 cm-1 merupakan gugus O ̶ Fe dan 1026 cm-1 yang merupakan gugus fungsi dari C ̶ O. Hasil XRD menunjukkan puncak-puncak karakteristik magnetit dan K-Fe3O4 terdapat di 2θ = 35,79° dan 36,01° dimana hasilnya tidak mengalami perubahan yang signifikan menandakan bahwa senyawa magnetit ini tetap ada di K-Fe3O4. Konsentrasi ion logam Pb2+ setelah adsorpsi ditentukan secara spektrofotometer serapan atom (SSA). Hasil penelitian didapatkan bahwa perbandingan komposisi yang ideal adalah 1:1 dengan % penyerapan sebesar 94,97 % untuk ion logam Pb2+. Kata kunci: Adsorben, Magnetit, Kitosan, Ion Logam Pb2+, Fourier Transform Infared (FTIR), X-ray Powder Diffraction (XRD), Spektrofotometer Serapan Atom (SSA).
KINETIKA ADSORPSI Cr(VI) MENGGUNAKAN ADSORBEN MAGNETIT (Fe 3 O 4 ) DAN MAGNETIT TERLAPIS ASAM HUMAT (Fe 3 O 4 /AH) Soerja Koesnarpadi; Daniel Tarigan
PROSIDING SEMINAR KIMIA SEMINAR NASIONAL KIMIA 2014
Publisher : PROSIDING SEMINAR KIMIA

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The adsorption kinetics of Cr(VI) by two adsorbents, i.e. magnetite (Fe 3 O 4 ) and magnetite coated humic acids (Fe 3 O 4 /HA) have been studied. Adsorbent of Fe 3 O 4 and Fe 3 O 4 /HA were synthesized by co-precipitation method and then characterized by FT-IR, XRD and TEM image measurements. The acidity of the solution was adjusted to pH 3, comparasion on the adsorption kinetics of Cr(VI) on Fe 3 O 4 between Fe 3 O 4 /HA. The FT-IR spectra revealed the presence of main fuctional groups of Fe-O and C-O at free carboxylate acid in Fe 3 O 4 /HA and those of only Fe-O in Fe 3 O 4 . The two adsorbent had similar diffraction peaks at 2θ. The TEM image demonstaretd that Fe 3 O 4 were spherical in shape and uniform distribution and then Fe 3 O 4 /HA had no uniform size. Adsorption of Cr(VI) by Fe 3 O 4 was much faster than Fe 3 O 4 /HA at the acidity of pH 3, with adsorption rate constant (k) of 0.013 g.mg -1 .menit -1 for Fe 3 O 4 and 0.0062 g.mg -1 .menit -1 for Fe 3 O 4 /HA. The two adsorbents were giving a model of adsorption kinetics Ho (pseudo order 2).
PHENOL ADSORPTION USING COMPOSITE ADSORBENT Fe3O4-ACTIVATED CHARCOAL COFFEE GROUNDS Elen Reknosari; Teguh Wirawan; Soerja Koesnarpadi
JURNAL KIMIA MULAWARMAN Vol 18 No 1 (2020)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/jkm.v18i1.923

Abstract

ABSTRACT Phenol adsorption using composite adsorbent Fe3O4-activated charcoal coffee grounds has been done. Composite adsorbent Fe3O4 -activated charcoal coffee grounds are synthesized from FeSO4. 7H2O and FeCl3. 6H2O with a ratio of 3: 2 and then compiled with activated coffee charcoal. The composite adsorbent Fe3O4-activated coffee charcoal was characterized by Fourier Transform Infared (FTIR) and Scanning Electron Microscopy (SEM) as well as the adsorption test on phenol. The results of the characterization with Fourier Transform Infared (FTIR), peak 1604.77 cm-1 appeared showing the absorption of C=O which states that coffee grounds have formed carbon. Beside that, Fe3O4-activated charcoal composite adsorbent peaks appear at a wavelength of 509.21 cm-1 which is a Fe-O group showing that Fe3O4 nanoparticles have been successfully grafted on the active charcoal structure. The optimum conditions of phenol adsorption using adsorbent composite Fe3O4-activated coffee grounds at 30 minutes contact time and pH 5. Keywords: Adsorption, Phenol, Magnetite, Active Charcoal, Coffee Grounds
Humic Acid-Modified Magnetite Nanoparticles for Removing [AuCl4]− in Aqueous Solutions Soerja Koesnarpadi Koesnarpadi; Nanang Tri Widodo; Acmad Maulana Maulana
Jurnal Kimia Sains dan Aplikasi Vol 25, No 1 (2022): Volume 25 Issue 1 Year 2022
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (952.581 KB) | DOI: 10.14710/jksa.25.1.27-33

Abstract

Humic acid-modified magnetite nanoparticle (MnP-HA) has been synthesized using the co-precipitation method and applied for removal of [AuCl4]−. Modifying of MnP-HA was prepared with the mass ratio of MnP-HA=10:1 and 10:3. The HA was extracted from peat soil of Sambutan Village, East Kalimantan, Indonesia, by the recommended procedure of the International Humic Substances Society (IHSS). The saturation magnetization of MnP-HA was decreased compared to unmodified MnP. The interaction between MnP and HA was occurred due to the chemical bond between Fe from MnP with the carboxylic group from HA. The coating HA on the surface of MnP unchanged the formation of the crystal structure of MnP and increased the particle size. The optimum removal of [AuCl4]− on MnP and MnP-HA materials was optimum at pH 3.0. The Langmuir isotherm model with sorption capacity was 0.23, 4.85, and 4.65 mol g–1 for MnP, MnP-HA=10:1, and 10:3, respectively. Using a pseudo-second-order equation, the degradation of the kinetics model of [AuCl4]− on MnP, MnP-HA=10:1 and 10:3 with adsorption rate constant (k) were 0.02, 0.07, and 0.06 g.mol min–1.
PEMBUATAN DAN KARAKTERISASI ADSORBEN KITOSAN–SILIKA DAN PENGAPLIKASIAN TERHADAP ADSORPSI ION Cd2+ Nisa, Muflihatu Khoiratun; Lianasari, Ika Yekti; Koesnarpadi, Soerja
JURNAL ATOMIK Vol 7 No 1 (2022)
Publisher : Jurusan Kimia FMIPA UNMUL

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The Research has been conducted on the synthesis of chitosan-silica adsorbents from chitosan and silica derived from TEOS (Tetraethyl Orthosylicate). The chitosan-silica was made by mixing chitosan solution and silica soles that were previously chitosan we were added with acetic acid and silica solution we were added with aqueous solution, ethanol and HCl(p). The result from characterization of FT-IR chitosan-silica adsorbents indicates the presence of OH, NH2, Si-O, Si-O-Si, chitosan adsorbents that only have OH and NH2 groups and silica adsorbents that only have OH, Si-O and Si-O-Si groups. Application of chitosan, silica and chitosan-silica adsorbents to adsorp Cd2+ ion. Cd2+ ion concentration after adsorption was determined by atomic absorption spectrophotometer (AAS). Adsorption Cd2+ ion in chitosan-silica successfully indexed Cd2+ by 98.67% while for chitosan adsorbents by 97.87% and while silica adsorbents by 79.45%. The Sem results showed that when adsorbents before soaking with Cd2+ it was seen that the morphology of the surface of the pores adsorbent there is still a cavity then when after soaking with Cd2+ pores filled by ions Cd2+.
UJI AKTIVITAS TABIR SURYA EKSTRAK HERBA MENIRAN (Phyllanthus niruri L.) Nabila, Sahira Fara; Koesnarpadi, Soerja; Widodo, Nanang Tri; Isyahro, Novia Rahmawati; Marliana, Eva
JURNAL ATOMIK Vol 7 No 2 (2022)
Publisher : Jurusan Kimia FMIPA UNMUL

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Abstract

Tests of sunscreen activity of meniran (Phyllanthus niruri L.) herbs extract has been done. The methodwas carried out using an UV-Vis spectrophotometer in vitro based on the method of A. J. Petro. The sunscreenactivity based on the value of the Sun Protection Factor (SPF) meniran herbs extract, respectively, was 1,826;3,337; 6,096; 11,132 and 20,354. The SPF value of sunscreen activity showed that meniran herbs extract has aminimum to ultra protection category.
PENENTUAN VARIASI KOMPOSISI DAN pH OPTIMUM ADSORBEN KITOSAN-Fe3O4 BERDASARKAN PERSEN PENYERAPAN ION Pb2+ Lianasari, Ika Yekti; Koesnarpadi, Soerja; Pratiwi, Djihan Ryn; Munandar, Aris
JURNAL ATOMIK Vol 8 No 1 (2023)
Publisher : Jurusan Kimia FMIPA UNMUL

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Previously, the synthesis of Chitosan-Fe3O4 adsorbent from magnetite (Fe3O4) made from ferrous ammonium sulfate (III) and ferrous ammonium sulfate (II) in a ratio of 3:1 was carried out. The adsorbent is adjusted with the ratio of magnetite and chitosan composition 1:1; 1:2 and 2:1 with the help of glutaraldehyde as a crosslinker. The results showed that the ratio of the ideal composition is 1:1 with % absorption that is 94.97% in 24 hour, and the optimum pH is obtained at pH 5 with % absorption of 92.18% for Pb2+ ions.
ADSORPSI FENOL MENGGUNAKAN ADSORBEN KOMPOSIT Fe3O4-ARANG AKTIF AMPAS KOPI Reknosari, Elen; Wirawan, Teguh; Koesnarpadi, Soerja
JURNAL ATOMIK Vol 6 No 2 (2021)
Publisher : Jurusan Kimia FMIPA UNMUL

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ABSTRAK Adsorpsi fenol menggunakan adsorben komposit Fe3O4-Arang aktif ampas kopi telah dilakukan. Adsorben komposit Fe3O4-Arang aktif ampas kopi disintesis dari FeSO4.7H2O dan FeCl3.6H2O dengan perbandingan 3:2 kemudian dikomposit dengan arang aktif ampas kopi. Adsorben komposit Fe3O4-Arang aktif ampas kopi dikarakterisasi dengan Fourier Transform Infared (FTIR) dan Scanning Electron Microscopy (SEM) serta dilakukan uji adsorpsi terhadap fenol. Hasil karakterisasi dengan Fourier Transform Infared (FTIR), muncul peak 1604,77 cm-1 menunjukkan adanya serapan C=O yang menyatakan bahwa ampas kopi telah membentuk zat karbon. Selain itu adsorben komposit Fe3O4-arang aktif ampas kopi muncul peak pada panjang gelombang 509,21 cm-1 yang merupakan gugus Fe-O menunjukkan bahwa nanopartikel Fe3O4 telah berhasil tercangkok pada struktur arang aktif. Kondisi optimum adsorpsi fenol menggunakan adsorben komposit Fe3O4-arang aktif ampas kopi adalah pada waktu kontak 30 menit dan pH 5. Kata kunci: Adsorpsi, Fenol, Magnetit, Arang Aktif, Ampas Kopi
Kinerja Analitik Mikrokapsul Magnetit - Alginat (MNPs-ALG) untuk Analisis Ion Logam Cu(II) dan Aplikasinya pada Sampel Alam: Analytical Performance of Magnetite - Alginate Microcapsules (MNPs-ALG) for Analysis of Cu(II) Metal Ions and Their Application in Samples Lianasari, Ika Yekti; Aman Sentosa Panggabean; Bohari Yusuf; Alimuddin; Koesnarpadi, Soerja
KOVALEN: Jurnal Riset Kimia Vol. 10 No. 1 (2024): April Edition
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/kovalen.2024.v10.i1.16574

Abstract

Research has been carried out regarding the synthesis of Magnetite-Alginate microcapsules (MNPs-ALG) and applied to Cu (II) metal ions. The nature of magnetic nanoparticles, Fe3O4 which easily form aggregations can be overcome by this encapsulation process, but a very efficient separation process is also very much needed in the analytical separation process.The process of making magnetite nanoparticle compounds is carried out first using FeCl2.4H2O and FeCl3.6H2O and adding concentrated ammonia at a temperature of 90οC until the solution becomes blackish in color. The dry magnetite, Fe3O4, nanoparticles were then dissolved in distilled water and thickened with Na-Alginate then dropped slowly into a 1 M CaCl2 solution. The results of characterization using SEM showed that there were differences in morphology before and after contact, and there was 0.98% mass of Cu elements on the EDS results.The microcapsule adsorption optimization test gave results for the best adsorption percentage >90% on a mass variation of magnetite (MNPs) of 0.3 grams; pH 5; contact time of 30 minutes and retention capacity of 185.95 mg/gram, at a Cu(II) concentration of 800 ppm. Analytical performance shows the best results with linearity parameters with a correlation coefficient of 0.999; the detection limit and quantitation limit are 0.0516 ppb and 0.1720 ppb with a lifetime of four times. The application of samples in the form of river water samples shows a percent recovery value of around >90%, indicating that there is no matrix that significantly influences the measurements.
Strategi Peningkatan Kualitas Pembelajaran Kimia bagi Siswa SMA Negeri 1 Muara Badak melalui Praktikum Kimia Hairani, Rita; Koesnarpadi, Soerja; Wirawan, Teguh; Ruga, Ritbey; Ersanto, Tri Edi
Jurnal Abdimas Mahakam Vol. 8 No. 02 (2024): Juli
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24903/jam.v8i02.2595

Abstract

Tersedianya sarana dan prasarana di tingkat sekolah menengah atas (SMA) untuk melaksanakan praktikum kimia berupa laboratorium serta alat dan bahan praktikum kimia sangatlah penting terhadap peningkatan kualitas pembelajaran bagi siswa. SMA Negeri 1 Muara Badak merupakan salah satu SMA yang berada di kecamatan Muara Badak Kalimantan Timur dan memiliki sarana laboratorium untuk melakukan praktikum. Namun kegiatan praktikum kimia terkendala untuk rutin dilaksanakan yang dikarenakan kurang memadainya alat dan bahan praktikum di sekolah tersebut. Sehubungan dengan kendala yang dihadapi dan sebagai upaya implementasi salah satu poin Tri Dharma Perguruan Tinggi, yaitu pengabdian kepada masyarakat, maka tim dosen Jurusan Kimia FMIPA Universitas Mulawarman pada 5 Juni 2023 berinisiatif untuk melakukan pendampingan praktikum kimia dan juga menyediakan alat dan bahan praktikum kimia yang dapat dilaksanakan di sekolah tersebut. Kegiatan ini juga diparalelkan dengan penyampaian materi mengenai keselamatan dan kesehatan kerja (K3) di laboratorium oleh pihak PT. Global Environment Laboratory (PT. GEL) Samarinda yang merupakan mitra kerjasama. Pada kegiatan ini, pengumpulan data menggunakan instrument berupa angket pre-test dan post-test yang disebarkan ke 30 siswa SMA Negeri 1 Muara Badak. Hasil analisis terhadap jawaban angket pre-test menunjukkan bahwa sekitar 71% siswa setuju bahwa kimia adalah subjek yang menarik dan 72% siswa setuju bahwa kimia berguna untuk memahami fenomena sehari-hari. Selanjutnya, berdasarkan analisis data angket post-test menunjukkan bahwa sebagian besar siswa setuju dengan uraian yang dijabarkan di angket. Secara keseluruhan hasil analisis angket-angket tersebut menunjukkan bahwa kegiatan yang telah dilakukan memiliki dampak yang cukup baik bagi siswa SMA Negeri 1 Muara Badak dalam hal motivasi belajar terhadap pembelajaran kimia melalui metode praktikum.
Co-Authors Acmad Maulana Maulana Adhaina, Karina Alimuddin Aman Sentosa Panggabean Anuar, Hajar Aris Munandar Arsyakia, Tarisa Bohari Yusuf Budi Hastuti Daniel Tarigan Degirmenci, Volkan Djihan Ryn Pratiwi, Djihan Ryn Elen Reknosari Ersanto, Tri Edi Erwin - Eva Marliana, Eva Fatmawati, Ririn Anggraeni Fradita, Windiy Mira Hadi Nur Hairani, Rita Isyahro, Novia Rahmawati Lai, Sin Yuan Liana Sari, Ika Yekti Lianasari, Ika Yekti Mahyati, Agus Mukhamad Nurhadi, Mukhamad Nabila, Sahira Fara Nanang Tri Widodo Nanang Tri Widodo Nazarudin Nisa, Muflihatu Khoiratun Noor Hindryawati, Noor Rahmawati, Rahmawati Reknosari, Elen Ruga, Ritbey Saptono Hadi, Saptono Teguh Wirawan Teguh Wirawan, Teguh Wirhanuddin, Wirhanuddin Yuniar Ponco Prananto