SYNTHESIS AND PROPERTIES OF 1-(2-AMINOETHYL)PIPERAZINE RESIN USED IN THE SORPTION OF THE PLATINUM-GROUP AND GOLD IONS

The optimum condition for synthesis of 1-(2-aminoethyl)piperazine resi n (AEPZR) is molar ratio of reagents, piperazine/Cl = 3.0, reaction te mperature 100 degrees C, reaction time 10 h and 1,4-dioxane used as a solvent. The functional group capacity of AEPZR is 2.78 mmol FG/g resi n. The structure of the resin was confirmed by FT-IR and elementary an alysis. The sorption capacities of AEPZR for Au(III), Pd(II), Ru(III), Os(VI), Pt(IV), Ir(IV) are as high as 5.38, 3.67, 3.46, 3.10, 2.46, 2 .24 mmol ion/g resin, respectively. The apparent activation energies o f sorption of AEPZR for Au(III) and Pt(IV) are 24 +/- 7, 28 +/- 4 kJ/m ol, individually. The sorption molar ratios (metal ion/FG molar ratio) were determined. The dynamic properties of sorption and elution were studied. Noble metal ions adsorbed on AEPZR can be eluted quantitative ly by 2% thiourea in 0.1 mol HCl/l. The sorption mechanism was examine d by X-ray photoelectron spectra.