Abstract
Adsorbent magnetite-dimercapto-silica (Fe3O4 - DMS) is a synthesis of magnetite with 2,3-dimercapto-1-propanol which has been applied to adsorb anions [AuCl4] - and [Cr2O7]-2. The adsorption process of metal anion [AuCl4]- at pH 5 with a contact time of 100 minutes was found optimum results at an adsorption capacity of 77.58 mg/g and an adsorption efficiency value of 96.975%. While the optimum conditions of metal anion [Cr2O7]-2 after the adsorption process at pH 4 with a contact time of 90 minutes was found an adsorption capacity of 85.0426 mg/g and an adsorption efficiency value of 85.0426%. The adsorption efficiency of metal anions [AuCl4]- is higher than the adsorption efficiency of metal anions [Cr2O7] -2Â
Highlights
Nanoteknologi suatu ilmu perekayasaan dan teknologi berdasarkan ukuran materi pada skala nanometer dimana akan berbeda dari sifatnya semula[1]
- is higher than the adsorption efficiency of metal anions
on magnetite coated with mercapto groups modified rice hull ash silica
Summary
Bahan yang digunakan pada penelitian ini adalah FeSO4.5H2O (Merck), FeCl3.7H2O (Merck), NH4OH (Merck), HCl (Merck), 2,3-. Dimerkapto-1-propanol, akuades, tetrakloroaurat [AuCl4]-, dan kalium dikromat [K2Cr2O7]. Peralatan alat-alat gelas, timbangan analitik, furnace, shaker, hotplate, bar stirrer magnetik,, Atomic Absorbsion Spectrophotometri (AAS), Spektroskopi FT-IR, X-ray Diffraction (XRD), dan Scanning Electron Microscopy (SEM) untuk identifikasi dan karakterisasi adsorben. Magnetit disintesis dengan metode kopresipitasi dari 16.2 g FeCl3.6H2O dan 9.7 g FeSO4.7H2O masing-masing dalam 25 mL akuades yang dilarutkan hingga homogen kemudian kedua larutan tersebut dicampur. Campuran larutan tersebut dipanaskan pada suhu 60 °C, diaduk dengan stirrer dan diteteskan NH4OH 10% sedikit demi sedikit hingga menghasilkan endapan berwarna hitam. Kemudian endapan dipisahkan dari larutan dengan disaring. Endapan hasil saringan dibilas dan dikeringkan dalam oven selama 3 jam pada suhu 80 °C. Endapan yang merupakan magnetit yang diperoleh tersebut dikarakterisasi dengan menggunakan FTIR, SEM dan XRD
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