FUNCTIONALIZATION OF FE3O4/SIO2 WITH N-(2-AMINOETHYL)-3-AMINOPROPYL FOR SORPTION OF [AUCL4]-
ABSTRACT: Synthesis of
Fe3O4/SiO2 modified with N-(2-aminoethyl)-3-aminopropyl group (Fe3O4/SiO2/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-1min-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
Fe3O4/SiO2/ED could be easily desorbed with 0.2 mol L-1 HCl containing 2 wt.%
of thiourea with recovery of 99.8%. Fe3O4/SiO2/ED was reusable and stable in 5
cycles of adsorption-desorption with recovery more than 90%. Fe3O4/SiO2/ED
showed high selectivity towards Au(III) in the multimetal system
Au(III)/Cu(II)/Cr(VI) with the coefficient selectivity for αAu-Cu of 227.5and
for αAu-Cr of 12.3.
Author: Nuryono, Mighfar
Syukur, Agus Kuncaka, Satya Candra Wibawa Sakti
Journal Code: jpkimiagg160088
