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All Journal JURNAL KIMIA SAINS DAN APLIKASI PROSIDING SEMINAR KIMIA Jurnal Kimia Mulawarman JURNAL ATOMIK
Soerja Koesnarpadi
Jurusan Kimia Fakultas Matematika Dan Ilmu Pengetahuan Alam Universitas Mulawarman
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Energy Engineering Environmental Science

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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
STUDY ON PHOTODEGRADATION ACTIVITY OF RHODAMINE B BY WO3/TIO2/SIO2 COMPOSITES IN VARIOUS MATERIAL WEIGHT CONDITION Karina Adhaina; Noor Hindryawati; Soerja Koesnarpadi
JURNAL ATOMIK Vol 5 No 1 (2020)
Publisher : Jurusan Kimia FMIPA UNMUL

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Abstract

A study on photodegradation activity of Rhodamine B by WO3/TiO2/SiO2 composites in various material weight condition has been conducted. The photocatalytic process was carried out in a closed reactor equipped with visible lamps (grow LED 10 watt). To identify crystal structure, morphology and composition of composite WO3/TiO2/SiO2, the characterization performed using Scanning Electron Microscopy-Energy Diffraction-X (SEM-EDX). The results of characterization using SEM-EDX showed that composites have a non-uniform pore morphology. The photocatalytic test showed the optimum material weight at 0.15 gram with percent degradation of Rhodamine B dyes of 85.10%.
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.
Co-Authors Acmad Maulana Maulana Aris Munandar Daniel Tarigan Elen Reknosari Karina Adhaina Liana Sari, Ika Yekti Nanang Tri Widodo Noor Hindryawati, Noor Teguh Wirawan