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All Journal CHEMICA Jurnal Teknik Kimia Walisongo Journal of Chemistry
Sutarno Sutarno
Universitas Gadjah Mada
Chemical Engineering, Chemistry & Bioengineering Chemistry Energy

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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.
Studi Perbandingan Adsorpsi-Desorpsi Anion Nitrat dan Sulfat pada Bentonit Termodifikasi Syarifah Rabiatul Adawiah; Sutarno Sutarno; Arfiani Nur; Rahmiani Gani; Titik Andriani
Walisongo Journal of Chemistry Vol 4, No 1 (2021): Walisongo Journal of Chemistry
Publisher : Department of Chemistry Faculty of Science and Technology Walisongo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21580/wjc.v4i1.7585

Abstract

Telah dilakukan studi perbandingan adsorpsi-desorpsi nitrat dan sulfat pada bentonit termodifikasi. Adsorpsi dilakukan dengan mengocok adsorben dalam larutan adsorbat pada kondisi pH, waktu kontak dan konsentrasi optimum. Selanjutnya dilakukan studi desorpsi pada air dan asam sitrat yang menggunakan adsorben yang telah mengadsorpsi nitrat dan sulfat. Studi menunjukkan bahwa kapasitas adsorpsi dipengaruhi oleh muatan dan ukuran anion. Semakin kecil muatan dan ukuran anion, semakin besar kapasitas adsorpsinya. Hasil penelitian menunjukkan kapasitas adsorpsi: nitrat (0,032 mmol g-1) sulfat (0,020 mmol g-1). Pada studi desorpsi menunjukkan bahwa persentase pelepasan juga dipengaruhi oleh muatan dan ukuran anion, semakin besar muatan dan ukuran anion maka semakin mudah proses desorpsi. Persentase desorpsi dalam air pada waktu kesetimbangan adalah: sulfat (71,33%) nitrat (50,71%) dan dalam asam sitrat adalah: sulfat (95,76%) nitrat (59,05%). Hasil penelitian menunjukkan bahwa kelarutan anion dalam asam sitrat lebih besar dari pada air, hal ini merupakan persyaratan untuk aplikasi pupuk lepas lambat (SRF).
Co-Authors Arfiani Nur Hilmi Hamidi Lingga Binagara Maya Rahmayanti Rahmiani Gani Sri Juari Santosa Syarifah Rabiatul Adawiah Titik Andriani