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Issue 9, 2008
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Recovery of precious metals by using chemically modified waste paper

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Abstract

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.

Graphical abstract: Recovery of precious metals by using chemically modified waste paper

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Publication details

The article was received on 20 Feb 2008, accepted on 30 May 2008 and first published on 21 Jul 2008


Article type: Paper
DOI: 10.1039/B802946F
New J. Chem., 2008,32, 1634-1641

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    Recovery of precious metals by using chemically modified waste paper

    C. R. Adhikari, D. Parajuli, K. Inoue, K. Ohto, H. Kawakita and H. Harada, New J. Chem., 2008, 32, 1634
    DOI: 10.1039/B802946F

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