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Sorption method is used for analysis of technological, geological and hydro-chemical samples with low content of precious metals and chemical pre-concentration of technological solution. Synthesized silicon-organic polymer containing thiocarbamide group, which named poly[bis -N,N’-(3-silsesquioxanilpropyl)-thiocarbamide]-(PSTM-3T) was used in this investigation. Sorption of Au(III) and Ag(I) ions from aqueous solutions of nitric acid has been studied using the silicon-organic polymer (PSTM-3T) under different experimental conditions. Better sorption was obtained at temperature 55 °C, 3 mol/L of nitric acid solution and contact time 300 min and 240 min for Ag(I) and Au(III).Thermodynamic parameters were calculated by Van’t Hoff equation. The negative values of ∆G at different temperatures indicate the feasibility of the process and the values become more negative with increase in temperature. The positive values of ∆H and ∆S indicate that the sorption process is endothermic and determine the disorderliness of the sorption at solid-liquid interface. Experimental data were evaluated to find out kinetic characteristics and found that the sorption of Au(III) followed pseudo-second order model and the sorption of Ag(I) followed pseudo-first order model. The sorption capacity increased with the increase in temperature and reached maximum value at 323 K and 328 K for Au(III) and Ag(I). The maximum sorption capacity of PSTM-3T for Au(III) and Ag(I) evaluated 333 and 129 mg/g.

Thermodynamics and Kinetics of Au(III) and Ag(I) Sorption on to Silicon-Organic Polymer