Synthesis of Imprinted Ionic Material (SiO2(BGS/RHA)-TMPDT-Im-Au) for Adsorption of Ion Au(III)

Abstract

Synthesis of imprinted ionic material SiO2(BGS/RHA)-TMPDT-Im-Au) was successfully studied. Sodium silicate from a mixture of ash bagasse and rice husk (Na2SiO3(BGS/RHA)) were used as the precursors. Furthermore, Na2SiO3(BGS/RHA is modified with the N 1-(3-Trimethoxysilylpropyl)diethylenetriamine (TMPDT) in which Au(III) ions are used as templates. The synthesis results were characterized by Fourier-transform infrared spectroscopy (FTIR), Surface area analyzers (SAA), Thermo Gravimetric analysis (TGA), Scanning Electron Microscope with Energy Dispersive X-ray Spectroscopy (SEM-EDX). The adsorption study was carried out using a batch system conducted in various pH and contact time. The adsorption process achieved a maximum pH of 3 in a 60-minute equilibrium time. Au(III) adsorption capacity of SiO2(BGS/RHA)-TMPDT-Im-Au was 10.44 mg/g. The kinetic studies show that the adsorption of Au(III) on SiO2(BGS/RHA)-TMPDT-Im-Au follows a pseudo-second-order with the reaction rate constant (k) of 76.7331 g mol-1 min-1.