Rice straw was modified by azide–alkyne click reaction in order to realize selective extraction of noble
metal ions. The ability of the modified straw to adsorb Pd2+ and Pt4+ was assessed using a batch adsorption
technique. It was found that the sorption equilibrium could be reached within 1 h and the adsorption
capacity increased with temperature for both Pd2+ and Pt4+. The maximum sorption capacities for Pd2+
and Pt4+ were respectively attained in 1.0 and 0.1 mol/L HCl. The modified straw showed excellent selectivity
for noble metal ions in comparison to the pristine straw. In addition, the modified straw was examined
as a column packing material for extraction of noble metal ions. It was indicated that 1.0 mL/min
was the best flow rate for Pd2+ and Pt4+. The modified straw could be repeatedly used for 10 times without
any significant loss in the initial binding affinity.
2014 Elsevier