Synthesis and characterization of polyacrylonitrile-2-amino-2-thiazoline resin and its sorption behaviors for noble metal ions

摘要

Polyacrylonitrile-2-amino-2-thiazoline resin (PAN-ATAL) was synthesized from macroporous type crosslinked poly-acrylonitrile and 2-amino-2-thiazoline. The functional group capacity and percentage conversion of functional group of PAN-ATAL prepared under the optimum condition were 2.002 mmol FG/g and 15.90%, respectively. The structure of PAN-ATAL was confirmed by elemental analysis and X-ray photoelectron spectroscopy (XPS). The sorption capacities of PAN-ATAL for Rh(Ⅲ), Ru(Ⅳ), Ir(Ⅳ) and Pd(?) were 72.07, 137.6, 147.1 and 230.7 mg/g resin, respectively. PAN-ATAL resin has excellent sorption selectivity for Pd(Ⅱ) and Rh(Ⅲ) in the presence of common metal ions over a wide acidity range. The sorption rate constants of PAN-ATAL resin for Rh(Ⅲ) and Ir(IV) were determined. The apparent sorption activation energy (E_a) of PAN-ATAL for Ru(Ⅳ) and Ir(Ⅳ) was 58.8+-0.6 kJ mol~(-1) and 65.9+-0.9 kJ mol~(-1), respectively.