Department of Chemical and Biomolecular Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China.
J Hazard Mater. 2011 Feb 15;186(1):902-10. doi: 10.1016/j.jhazmat.2010.11.088. Epub 2010 Nov 30.
Silk sericin and chitosan biosorbents are low cost and highly efficient biosorbents derived from waste biomass. Both biosorbents displayed good capacity and excellent selectivity for gold adsorption. Silk sericin and chitosan adsorbed respectively 1 and 3.3mmolg(-1) of gold and have K(d) values of 450 and 34,000, respectively. Experimental evidence showed that gold adsorbed on the amide groups of the silk sericin, while gold and copper adsorbed on the amino groups of chitosan via charge-interactions and complexation. Binary (Au-Cu), five (Au-Co-Ni-Cu-Zn) and six (Au-Pd-Co-Ni-Cu-Zn) component separations consistently showed that silk sericin has better selectivity (Sel(Au)>2.4) than chitosan. It is possible to recover gold at 99.5% purity by silk sericin and 90% if the solution contained palladium.
丝胶和壳聚糖生物吸附剂是从废生物质中提取的低成本、高效的生物吸附剂。这两种生物吸附剂对金的吸附都表现出了良好的容量和优异的选择性。丝胶和壳聚糖分别吸附了 1 和 3.3mmol/g 的金，其 K(d) 值分别为 450 和 34000。实验证据表明，金吸附在丝胶的酰胺基团上，而金和铜通过电荷相互作用和络合吸附在壳聚糖的氨基上。二元（Au-Cu）、五元（Au-Co-Ni-Cu-Zn）和六元（Au-Pd-Co-Ni-Cu-Zn）组分分离均表明，丝胶的选择性（Sel(Au)>2.4）优于壳聚糖。如果溶液中含有钯，丝胶可以以 99.5%的纯度回收金，如果溶液中含有钯，90%的金可以被回收。
