Nano Science and Technology Institute
Nanotech 2005 Vol. 2
Nanotech 2005 Vol. 2
Technical Proceedings of the 2005 NSTI Nanotechnology Conference and Trade Show, Volume 2
Chapter 4: Nano Devices and Systems

Gold Removal and Recovery using Mesoporous Silica Adsorbents

Authors:K.F. Lam, K.L. Yeung and G. McKay
Affilation:Hong Kong University of Science and Technology, CN
Pages:273 - 276
Keywords:selectivity, adsorption, metal, mesoporous
Abstract:This work investigates the selective removal of dissolved metal ions from aqueous solutions using MCM-41 adsorbents grafted with different chemical moieties. A systematic study was conducted to understand the adsorption mechanisms, in order to better design better adsorbent material. The targeted removal of precious (i.e., Au and Ag) and toxic metals (i.e., Hg, Pb, Cd) from solutions containing base metals (i.e., Cu and Fe) was achieved. MCM-41 could be successfully tailored only to remove gold (> 99.9%) from a solution containing copper. Pure gold can be recovered by simple washing step and the regenerated adsorbents can be reused. In the toxic metals such as Hg, selective removal and complete sequestration within the MCM-41 was demonstrated.
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