Abstract
Abstract An adsorption gel was prepared from waste paper by immobilizing iminodiacetic acid so as to investigate its adsorption behavior for various metal ions from chloride media. The gel was found to be selective for AuIII and PdII over PtIV and other base metal ions including CuII, FeIII, NiII and ZnII at varying concentrations of hydrochloric acid. Moreover, AuIII was reduced by the gel giving rise to clearly recognizable beautiful elemental gold particles which was confirmed by means of the XRD-spectrum and SEM-images of the adsorbent after adsorption. This result has increased the prospect for mutual separation of AuIII and PdII from coexisting PtIV and base metals.
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