SINTESIS SILIKA TERMODIFIKASI 2-MERKAPTOBENZIMIDAZOLE TERLAPIS PADA MAGNETIT SEBAGAI ADSORBEN Au(III); SYNTHESIS OF SILICA MODIFIED WITH 2-MERCAPTOBENZIMIDAZOLE COATED ON MAGNETITE FOR ADSORBENT OF Au(III)

Bolle, Theodor Caesar M, Nuryono

2015 | Disertasi | FMIPA

A research on the synthesis of silica modified with 2-mercaptobenzimidazole coated on magnetite (Fe3O4/SiO2/MBI) for adsorption of Au (III) has been conducted. Fe3O4 was synthesized via coprecipitation method of Fe(II) and Fe(III) salt mixture with sodium citrate as the dispersant. The effect of washing solvents (water, aceton and ethanol) on dispersion and particle size of magnetite was evaluated. Fe3O4/SiO2/MBI was synthesized via sol-gel process, using 3-chloropropyltrimethoksisilane (CTS) as a grafting agent. Precursor sodium silicate solution and 2-mercaptobenzimidazole (MBI) was added as mercapto-silica shell former. The effect of various mole ratios of Na2SiO3:CTS:MBI on character and Au(III) adsorption characteristics was also evaluated. The Fe3O4/SiO2/MBI was characterized with X-ray diffraction (XRD), Fourier Transform Infrared (FT-IR) spectroscopy and Transmission Electron Microscopy (TEM). The adsorption of Au(III) on Fe3O4/SiO2/MBI was carried out by mixing Au(III) solution with adsorbent in a batch system. The characterization result showed that presence of sodium citrate in magnetite synthesis without washing gives high dispersion and small particle size is 11.87 nm. Fe3O4/SiO2/MBI was synthesized with the ratio mole of Na2SiO3 : CTS : MBI 3:1:10 adsorbs Au(III) of 179,45 mg/g at pH of 3 for 60 minutes.

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