Journal
NEW JOURNAL OF CHEMISTRY
Volume 32, Issue 9, Pages 1634-1641Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/b802946f
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Funding
- Industrial Technology Research Grant Program [KS18000002]
- New Energy and Industrial Technology Development Organization (NEDO) in Japan
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Waste newsprint paper was chemically modified with p-aminobenzoic acid to prepare a sorption active gel. This gel proved useful for the selective uptake of gold, palladium and platinum over other coexisting metal ions such as copper, nickel, zinc and iron. A remarkably high capacity for Au(III) was observed together with a moderate uptake of Pt(IV) and Pd(IV). Furthermore, Au(III) was reduced to elemental gold which formed aggregates. A high percentage recovery of the precious metal ions (85-95%) and regeneration of the gel was attained by using a mixture of 0.15 M thiourea and 1 M HCl. Repeated cycles of uptake and elution by using a column packed with this new sorbent indicated that the gel is suitable for industrial application in continuous mode.
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