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Paper
New J. Chem., 2008, 32, 1634 - 1641, DOI: 10.1039/b802946f
Recovery of precious metals by using chemically modified waste paper
Chaitanya Raj Adhikari, Durga Parajuli, Katsutoshi Inoue, Keisuke Ohto, Hidetaka Kawakita and Hiroyuki Harada
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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