The Malaysian Journal of Analytical Sciences Vol 17 No 2 (2013): 244 – 254

 

 

 

SORPTION OF Au (III) AND Ag (I) ON AMINO- AND MERCAPTO-SILICA HYBRID COLUMNS

 

(Jerapan Au (III) dan Ag (I) pada Turus Hibrid Amino- dan Merkapto-silika)

 

Nuryono¹*, Nurma Y. Indriyanti², Julita B. Manuhutu³, Narsito¹, Shunitz Tanaka⁴

 

¹Department of Chemistry, Faculty of Mathematics and Natural Sciences

Universitas Gadjah Mada, Sekip Utara, Yogyakarta 55281, Indonesia

²Study Program of Chemical education, Faculty of Teacher Training and Education

Universitas Sebelas Maret Surakarta 57126, Indonesia

³Study Program of Chemistry, Faculty of Educational Sciences

Universitas Pattimura Ambon, Indonesia

⁴Division of Environmental material Science, Faculty of Environmental Earth Science,

Hokkaido University, Japan

 

*Corresponding author: nuryono_mipa@ugm.ac.id

 

 

Abstract

Adsorption-desorption of Au(III) and Ag(I) ion on amino-silica hybrid (ASH) and mercapto-silica hybrid (MSH) in a column system has been studied. Adsorption was conducted in a 0.5-g adsorbent packed column passing through 30 mL solution of Au(III)/Ag(I)/Cu(II) ions 10 mg/L for MSH and Au(III)/Ag(I)/Ni(II) for ASH with three repetitions. Desorption used eluent of thiourea in HCl solution with volume of 10 mL each. Concentration of metal ions in the eluent was analyzed with flame atomic absorption spectroscopy and the amount of metal ions desorbed was calculated. The results showed that metal ions loaded in the columns were adsorbed completely in both adsorbents. However, the amount of metal ions desorbed for first three fractions is depended on the concentration of eluent. Thiourea 1M in 1M HCl solution eluted 96.7% and 59.1% of Au(III) ion from MSH and ASH, respectively; and Ag(I) was desorbed 79.2% from MSH and 97.6% from ASH. Metal ions of Cu(II) and Ni(II) are not easily eluted with that eluent; only 45.8%  of Cu(II) was eluted from MSH and 5.0% of Ni(II) from ASH. Repetition of process in three-time use indicates the highly stability of the adsorbents; hence those are potential for solid phase extraction application.

 

Keywords:  sorption, gold, silver, silica, rice hull ash

 

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