Abstract
In this study, an efficiently employed ionic liquid combined with commercially available silica gel (SG-ClPrNTf2) was developed for selective detection of gold(HI) by use of inductively coupled plasma optical emission spectrometry (ICP-OES). The selectivity of SG-ClPrNTf2 was evaluated towards seven metal ions, including Y(III), Mn(II), Zr(IV), Pb(II), Mg(II), Pd(II) and Au(III). Based on pH study and distribution coefficient values, the SG-ClPrNTf2 phase was found to be the most selective towards Au(III) at pH 2 as compared to other metal ions. The adsorption isotherm of Au(III) on the SG-ClPrNTf2 phase followed the Langmuir model with adsorption capacity of 59.48 mg g(-1), which was highly in agreement with experimental data of adsorption isotherm study. The kinetics study indicated that Au(III) adsorption kinetics data were well fit with the pseudo-second-order kinetic model on the basis of correlation coefficient fitting (0.996) and adsorption capacity agreement (62.26 mg g(-1)). Furthermore, SG-ClPrNTf2 phase was effectively performed for the determination of Au(III) in real water samples with satisfactory results.