Adsorption kinetics of Au(III) ions on a novel chelating resin silica-gel functionalized by an amino organophosphonic acid

作者：Yin, Ping^*; Tian, Yuan; Qu, Rongjun; Zhang, Jiang

来源：Progress in Reaction Kinetics and Mechanism, 2012, 37(4): 344-354.

DOI：10.3184/146867812X13481351806773

• silica gel
• adsorption
• kinetics
• organophosphonic acid
• Au(III)

The adsorption kinetics of Au(III) on a novel chelating resin namely silica gel functionalized by an amino phosphonic acid (denoted as SiO2-EDA-APA) were studied. The results showed that SiO2-EDA-APA could reach its saturation adsorption capacity within 4 h, and its excellent adsorption capacity for Au(III) was 234.61 mg g(-1) when the initial solution concentration was 2.0 mmol L-1 at 35 degrees C. The adsorption kinetics of the as-synthesized hybrid adsorbent for Au(III) at different temperatures can be modelled closely by a pseudo second-order rate equation. The thermodynamic parameters of adsorption, Delta G, Delta H and Delta S were -18.89 kJ mol(-1), 19.82 kJ mol(-1), and 125.74 J K-1 mol(-1), respectively. It can be concluded that the adsorption of Au(III) on SiO2-EDA-APA is a spontaneous, endotherminc process controlled by film diffusion, which results in its higher adsorption capacity at higher temperatures.

• 出版日期2012
• 单位鲁东大学