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Precious metals are found in the process and wastewater streams of various industries including mining [1，2]， ore and metal processing [3]， semiconductor and electronic manufacturing [4，5] and e-Waste recycling [6，7]. Numerous works discu... Precious metals are found in the process and wastewater streams of various
industries including mining [1，2]， ore and metal processing [3]， semiconductor and
electronic manufacturing [4，5] and e-Waste recycling [6，7]. Numerous works discuss
the use of adsorption for precious metal separation and recovery [8-17]. Selective
adsorption is an attractive technology for separation， removal and recovery of
precious metals. Gold [9]， silver [10]， platinum [11] and palladium [12] were
selectively adsorbed from binary and complex mixtures and recovered at high purity
using polymeric resins [13] and adsorbents made from MCM-41 [14-16 ] and SBA-15
[17]. Tsezos and coworkers [18] reported the adsorption of palladium， gold， uranium，
yttrium， silver and nickel by biomass derived from two bacteria strains. They
observed that the biosorbents preferentially adsorbed gold and silver， both classified
as soft metals according to Pearson’s hard-soft acid-base (HSAB) principle [19].