Fig. 9d–f display the adsorption on chitosan from binary, five and six-component gold solutions. Chitosan adsorbed 80% of the gold and 24% of the copper in the binary solution (Fig. 9d).
This gives the chitosan an adsorption capacity for gold of 0.17mmole per gram that is comparable to silk sericin, but at a much lower selectivity of 1.1 and gold can only be recovered at 70% purity. However, chitosan displayed an excellent selectivity of 3.10 for gold adsorption
from the 5-components solution containing 0.19mM Au3+, 1.00mM Co2+, 1.00 Ni2+ 1.33mM Cu2+ and 1.04mM Zn2+ (Fig. 9e).
It removed close to 95% of the gold from the original solution (i.e.,37mgg−1). Fig. 9f shows that 95 and 100% of the original gold and palladium in the solution were adsorbed by chitosan with 35mg Au and 8mg Pd adsorbed on each gram of chitosan.
A separation selectivity of 0.33 was calculated for gold and palladium, and the
gold is recovered with palladium at about 70% purity.
Fig. 9d–f display the adsorption on chitosan from binary, five and six-component gold solutions. Chitosan adsorbed 80% of the gold and 24% of the copper in the binary solution (Fig. 9d). This gives the chitosan an adsorption capacity for gold of 0.17mmole per gram that is comparable to silk sericin, but at a much lower selectivity of 1.1 and gold can only be recovered at 70% purity. However, chitosan displayed an excellent selectivity of 3.10 for gold adsorptionfrom the 5-components solution containing 0.19mM Au3+, 1.00mM Co2+, 1.00 Ni2+ 1.33mM Cu2+ and 1.04mM Zn2+ (Fig. 9e).It removed close to 95% of the gold from the original solution (i.e.,37mgg−1). Fig. 9f shows that 95 and 100% of the original gold and palladium in the solution were adsorbed by chitosan with 35mg Au and 8mg Pd adsorbed on each gram of chitosan. A separation selectivity of 0.33 was calculated for gold and palladium, and thegold is recovered with palladium at about 70% purity.
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