Soerja Koesnarpadi
Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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SYNTHESIS, CHARACTERIZATION AND APPLICATION OF DIATOMACEOUS EARTH – 4,4-DIAMINODIPHENYLETHER-O-HYDROXYBENZALDEHYDE AS AN ADSORBENT OF AG(I) METAL ION Fatoni, Ahmad; Koesnarpadi, Soerja; Hidayati, Nurlisa
Indonesian Journal of Chemistry Vol 10, No 3 (2010)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (87.176 KB) | DOI: 10.22146/ijc.21436

Abstract

Synthesis, characterization and application of Diatomaceous Earth-4,4-Diamino diphenylether-O-Hydroxybenzaldehyde (diatomaceous earth-DDE-O-Hb) as an adsorbent of Ag(I) metal ion has been done. The aim of the purification of natural diatomaceous earth with KMnO4, H2SO4 and HCl were to obtain pure diatomaceous earth, remove the other compounds and de-alumination, respectively. The adsorbent of diatomaceous earth-DDE-O-Hb was synthesized by reacting pure diatomaceous earth with 3-chloropropyltrimethoxysilane, 4,4-diaminodiphenylether (DDE) and O-hydroxybenzaldehyde (O-Hb). The FTIR spectroscopy was used to identify Schiff base group in diatomaceous earth-DDE-O-Hb adsorbent. The diatomaceous earth-DDE-O-Hb was applied as adsorbent in the adsorption of Ag(I) metal ion. Parameters influencing the interaction such as time, pH and concentration were optimized. The result showed that diatomaceous earth-DDE-O-Hb adsorbent have Schiff base group. The interaction time of 90 min showed that 70.79% of Ag(I) metal ions at the concentration of 100 ppm can be adsorbed by diatomaceous earth-DDE-O-Hb adsorbent. At the pH solution between 2 to 7, the concentration of 100 ppm of Ag(I) metal ion that can adsorbed by diatomaceous earth-DDE-O-Hb adsorbent was up to 98% and at the concentration of 25 ppm Ag(I) metal ion, the adsorption of Ag(I) by diatomaceous earth-DDE-O-Hb adsorbent was near 91%.
KINETIKA ADSORPSI Cr(VI) MENGGUNAKAN ADSORBEN MAGNETIT (Fe 3 O 4 ) DAN MAGNETIT TERLAPIS ASAM HUMAT (Fe 3 O 4 /AH) Koesnarpadi, Soerja; Tarigan, Daniel
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).
Synthesis, Characterization of Cellulose Modified with 2-Mercaptobenzothiazole and Its Adsorption To Cu(II) Ion in Aqueous Solution Fatoni, Ahmad; Koesnarpadi, Soerja; Hidayati, Nurlisa
Indonesian Journal of Chemistry Vol 15, No 2 (2015)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (338.644 KB) | DOI: 10.22146/ijc.21214

Abstract

The modification of cellulose with 2-mercaptobenzhotiazole (MBT) through grafting and impregnating methods has been done. Modified cellulose used as adsorbent for Cu(II) ion in aqueous solution. The aims of research were modification cellulose with 3-chloropropyltrimethoxysilane and 2-mercaptobenzhotiazole (MBT), characterization of the modified cellulose with FTIR, SEM and XRD and adsorption study between cellulose-MBT adsorbent with Cu(II) ion in aqueous solution. The adsorbent of cellulose-MBT was synthesized by reflux process. Adsorption study between cellulose-MBT adsorbent with Cu(II) ion was investigated based on influence of pH solution, interaction time and initial concentration of Cu(II) ion. The result showed that activated cellulose can be modified with MBT to become cellulose-MBT adsorbent. The functional group of –C=N appeared at wavenumber 1658 cm-1 attributed to functional group of -C=N- is Schiff base of MBT. Presence functional group of S-H at cellulose-MBT adsorbent was not detected. The surface morphology of cellulose-MBT adsorbent after being interacted with Cu(II) ion was different before being interacted with Cu(II) ion. The diffractogram of cellulose-MBT adsorbent has similarity with cellulose-MBT adsorbent-Cu(II) ion. The optimum adsorption of Cu(II) ion was observed at pH 7.0 and 150 min of interaction time. Percentage of Cu(II) ion was absorbed by cellulose-MBT adsorbent tended to be constant after Cu(II) ion concentration 100 ppm.
Humic Acid Coated Fe3O4 Nanoparticle for Phenol Sorption Koesnarpadi, Soerja; Santosa, Sri Juari; Siswanta, Dwi; Rusdiarso, Bambang
Indonesian Journal of Chemistry Vol 17, No 2 (2017)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (555.303 KB) | DOI: 10.22146/ijc.22545

Abstract

The coating Fe3O4 using humic acid (HA) to form HA-coated Fe3O4 (Fe3O4/HA) was conducted and applied for phenol sorption. Fe3O4/HA was prepared using co-precipitation method in an alkaline condition using ammonium hydroxide and the addition of HA with mass ratios of Fe3O4 and HA=20:1, 10:1, 10:2, 10:3. The HA from peat soil in Sambutan village, East Kalimantan, Indonesia and was extracted in NaOH 0.1 M solution. The FT-IR characterization indicated that the coating of HA on the surface of Fe3O4 was successfully synthesized by forming a bond between the carboxylate group of HA and iron of Fe3O4. The coating of HA on the surface of Fe3O4 did not change the crystal structure of Fe3O4, but had lower peak intensities than Fe3O4 if added with HA with mass ratios 20:1, 10:1, 10:2, 10:3. The saturation magnetization of Fe3O4 decreased with the increased content of HA. SEM image indicated the magnetic particle size was almost homogenous by 10-18 nm. Iron and HA in Fe3O4/HA materials synthesized using different mass ratios were stable in pH range of 3.0-11.0 and 1.0–11.0, respectively. The phenol sorption on Fe3O4 was optimum at pH 5.0 and on Fe3O4/HA with mass ratios of 20:1, 10:1, 10:2, 10:3 were optimum at pH 5.0-6.0. The kinetics model for phenol adsorption on Fe3O4 and Fe3O4/HA with mass ratios of 20:1, 10:1, 10:2, 10:3 could be described using pseudo second-order equation and was in accordance with the Langmuir isotherm model with maximum adsorption capacity of 0.45 mmol/g for Fe3O4 and 0.55, 0.56, 0.58, 0.56 mmol/g respectively for Fe3O4/HA with mass ratios of 20:1, 10:1, 10:2, 10:3. The adsorption capacity increased with the increased content of HA, but the adsorption energy decreased except Fe3O4/HA with a mass ratio of 10:3. Generally, the performance of Fe3O4/HA materials was much higher than of bare Fe3O4.
DEGRADASI METILEN BIRU DENGAN METODE FOTOKATALITIK BERDASARKAN VARIASI BERAT KATALIS ZEOLIT-WO3 Chandra, Dian Eka; Hindryawati, Noor; Koesnarpadi, Soerja
PROSIDING SEMINAR KIMIA SEMINAR NASIONAL KIMIA 2019
Publisher : PROSIDING SEMINAR KIMIA

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Modifikasi zeolit alam dengan bahan semikonduktor WO3 yang digunakan sebagai katalis untuk reaksi fotokatalisis zat warna metilen biru telah dilakukan. Tahapan penelitian meliputi preparasi zeolit, aktivasi zeolit dengan HCl, modifikasi zeolit dengan WO3 menggunakan metode impregnasi dan uji fotokatalisis menggunakan variasi berat katalis Zeolit-WO3. Zeolit-WO3 dikarakterisasi dengan menggunakan XRD. Pola difraksi XRD menunjukkan bahwa pada sudut 2q = 26,84o dan 28,17o merupakan puncak dari WO3. Diperoleh persen degradasi metilen biru dengan konsentrasi 100 ppm, berat katalis 0,35 gram dan waktu kontak 75 menit adalah sebesar 99,66%.   Kata kunci: Zeolit, WO3, Impregnasi, Fotokatalisis, Metilen Biru.
VERIFIKASI METODE PENENTUAN TIMBAL (Pb) PADA PUPUK NPK MENGGUNAKAN ATOMIC ABSORPTION SPECTROPHOTOMETER (AAS) DI PT PUPUK KALIMANTAN TIMUR Friscylia, Friscylia; Koesnarpadi, Soerja; Panggabean, Aman Sentosa
PROSIDING SEMINAR KIMIA SEMINAR NASIONAL KIMIA 2019
Publisher : PROSIDING SEMINAR KIMIA

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Penelitian tentang verifikasi metode penentuan timbal (Pb) pada pupuk NPK menggunakan atomic absorption spechtrophotometer (AAS) di PT Pupuk Kalimantan Timur telah dilakukan. Penentuan timbal (Pb) pada pupuk NPK mengacu pada SNI 2803:2012. Tujuan penelitian ini adalah untuk meyakinkan bahwa laboratorium mampu melakukan pengujian secara rutin dan menghasilkan data yang valid dengan menggunakan parameter linearitas, akurasi, presisi, limit deteksi, limit kuantisasi dan estimasi ketidakpastian pengukuran. Hasil pengujian didapatkan kadar timbal (Pb) sebesar 22,20 mg/Kg dengan nilai linearitas sebesar 0,9994. Nilai akurasi dengan rentang 97,17 % sampai 107,29 %. Nilai repeatability dan reproducibility dengan % RSD ? 2/3 CV Horwitz secara berturut-turut yaitu 1,24 ? 6,69 dan 4,69 ? 6,67. Nilai limit deteksi adalah 0.39 mg/Kg dan nilai limit kuantisasi adalah 0,52 mg/Kg. Nilai estimasi ketidakpastian pengukuran adalah 22,20 mg/Kg ± 1,23 mg/Kg. Berdasarkan hasil penelitian, metode penentuan Pb dalam pupuk NPK menggunakan atomic absorption spechtrophotometer (AAS) dapat digunakan dengan hasil yang valid.   Kata Kunci: pupuk NPK, verifikasi metode, atomic absorption spechtrophotometer (AAS), timbal (Pb).
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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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 2? = 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).