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Synthesis of Fe 3 O 4 /SiO 2 modified with N-(2-aminoethyl)-3-aminopropyl group (Fe 3 O 4 /SiO 2 /ED) via coating method and its application for adsorption-desorption of anionic gold in aqueous solution have been conducted. The synthesized product was characterized with an X-ray diffractometer (XRD), a Fourier transform infrared (FT-IR) spectrophotometer and a transmission electron microscopy (TEM). Adsorption of Au(III) was conducted in a batch system and the variables included pH, contact time, and initial concentration were investigated. Results showed that magnetite/silica has been successfully functionalized with N-(2-aminoethyl)-3-aminopropyl in a homogeneous system. Kinetics study showed that adsorption of Au(III) followed the pseudo-second order model with rate constant of 0.710 g mmol L -1 min -1 . Furthermore, the experimental data fitted well with the Langmuir isotherm model with the maximum adsorption capacity for Au(III) of 142.9 mg g -1 and the energy of 25.0 kJ mol -1 . Gold loaded on the Fe 3 O 4 /SiO 2 /ED could be easily desorbed with 0.2 mol L -1 HCl containing 2 wt.% of thiourea with recovery of 99.8%. Fe 3 O 4 /SiO 2 /ED was reusable and stable in 5 cycles of adsorption-desorption with recovery more than 90%. Fe 3 O 4 /SiO 2 /ED showed high selectivity towards Au(III) in the multimetal system Au(III)/Cu(II)/Cr(VI) with the coefficient selectivity for α Au-Cu of 227.5and for α Au-Cr of 12.3.

indonesian journal of chemistry

Functionalization of Fe&lt;sub&gt;3&lt;/sub&gt;O&lt;sub&gt;4&lt;/sub&gt;/SiO&lt;sub&gt;2&lt;/sub&gt; with N-(2-Aminoethyl)-3-aminopropyl for Sorption of [AuCl&lt;sub&gt;4&lt;/sub&gt;]&lt;sup&gt;-&lt;/sup&gt;