SINTESIS HIBRIDA PROPILDIETILENTRIAMIN-SILIKA TERLAPIS PADA BAHAN MAGNETIK PASIR BESI UNTUK ADSORPSI Au(III); SYNTHESIS OF PROPYLDIETHYLENETRIAMINE-SILICA HYBRID COATED ON IRON SAND MAGNETIC MATERIAL FOR ADSORPTION OF Au(III)
Prasdiantika, Ricka, Nuryono
2015 | Disertasi | FMIPA UGMSynthesis of propyldiethylenetriamine-silica hybrid coated on magnetic material of iron sand (PB/SiO2/PDETA) for adsorption of Au(III) has been studied. Magnetic material was separated from iron sand using an external magnet, and activated using a solution of HCl. Activation was done with various concentrations of HCl solution 0.5; 1.0; 2.0; and 4.0 M for 30 minutes. Magnetic material was soaked with sodium citrate solution 0.5 M as the dispersion medium. PB/SiO2/PDETA was synthesized via sol-gel process by mixing magnetic material with sodium silicate solution (Na2SiO3) from rice husk ash and N-(3- trimethoxysilylpropyl)diethylenetriamine (TMSPDETA). In this study, PB/SiO2/PDETA was synthesized with a variety of mole ratios NaSiO3/TMSPDETA 0:1; 1:0; 1:0.5; 1:1; 1:2; and 1:3. Materials were characterized by X-Ray fluorescence (XRF), X-Ray diffractometer (XRD), Fourier Transform Infrared (FT-IR) Spectrophotometer, and Transmission Electron Microscopy (TEM). Adsorption ability of the material to Au(III) was evaluated in HAuCl4 solution with a concentration of Au(III) 200 ppm and pH 3 for 120 minutes. Concentration of Au(III) which was not adsorbed was analyzed with Atomic Absorption Spectroscopy (AAS). XRD characterization showed the higher the concentration of HCl solution used for activation of magnetic material, the greater intensity XRD and crystallinity of the magnetic material. The optimum activation was achieved in magnetic material washed with a solution of HCl 1 M. The results of characterization by XRD and TEM showed that propyldiethylenetriamine-silica hybrid coated on iron sand was synthesized. Adsorption results showed the greater of mole ratio Na2SiO3/TMSPDETA used in the synthesis of PB/SiO2/PDETA, the greater the adsorption capacity is generated. The optimum adsorption occurs at mole ratio NaSiO3/TMSPDETA 1:2 which was able to adsorb Au(III) with the amount of 182,18 mg/g.
Kata Kunci : silica; propyldiethylenetriamine; iron sand; adsorption of Au(III)
