| Summary: | Sorption of gold(III) ion in multi-metal system Au/Ni/Ag on amino silica
hybrid (ASH) column has been studied. ASH was synthesized by sol gel process
with sodium silicate (Na2SiO3) from rice husk ash (RHA) as precursor. ASH was
synthesized by adding 3M of hydrochloride acid solution to the mixture of (3-
aminopropyl)-trimethoxysilane and Na2SiO3 solution until pH 7 (neutral). ASH
was characterized by infrared (IR) spectroscopy and X-ray diffraction (XRD).
Adsorption of multi-metal (Au/Ni/Ag) system was carried out with a column
technique. The adsorbed metal ions [Au(III), Ni(II), and Ag(I)] were quantitavely
calculated based on the difference of metal ion concentration before and after
adsorption analyzed using atomic absorption spectroscopy (AAS). Desorption of
Au(III), Ni(II), and Ag(I) from ASH was conducted by using thioruea in
hydrochloride solution with variation of concentration. Desorbed metal ions were
determined using AAS.
The FTIR characterization indicated that ASH was successfully
synthesized, as shown with the presence of spesific absorption of functional
groups such as silanol (Si-OH), siloxane (Si-O-Si), amino (-NH2), dan methylene
(-CH2-). The XRD data showed that the structure of ASH was amorphous. Study
of adsorption Au(III) on HSA column indicated that the Au(III) was adsorbed
more than the other two metal ions. For desorption of multi-metal (Au/Ni/Ag), the
amount of eluted Au(III) using 1M HCl was 16.60%
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