Precious metal recovery by selective adsorption using biosorbents

被引：143

作者：

Chen, Xinqing ^{[1
]}

Lam, Koon Fung ^{[1
]}

Mak, Shuk Fong ^{[1
]}

Yeung, King Lun ^{[1
]}

机构：

[1] Hong Kong Univ Sci & Technol, Dept Chem & Biomol Engn, Kowloon, Hong Kong, Peoples R China

来源：

JOURNAL OF HAZARDOUS MATERIALS | 2011年 / 186卷 / 01期

关键词：

Gold adsorption; Selective adsorption; Silk sericin; Chitosan; Metal recovery; SILK FIBROIN; MESOPOROUS ADSORBENTS; GOLD ADSORPTION; GOLD(III) IONS; WASTE; BIOSORPTION; CHITOSAN; SERICIN; SORPTION; REMOVAL;

D O I：

10.1016/j.jhazmat.2010.11.088

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

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 3.3 mmol g(-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. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：902 / 910

页数：9

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