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Selective adsorption of gold from complex mixtures using mesoporous adsorbents
- Source :
-
Chemical Engineering Journal . Dec2008, Vol. 145 Issue 2, p185-195. 11p. - Publication Year :
- 2008
-
Abstract
- Abstract: Selective gold adsorption was investigated for the NH2-MCM-41 and SH-MCM-41 adsorbents prepared by grafting aminopropyl and thiolpropyl groups on the surface of the MCM-41 mesoporous silica. The single component adsorption of gold, copper and nickel from salt solutions, and the binary adsorption studies of Au3+/Cu2+ and Au3+/Ni2+ solutions were carried out for the two adsorbents. Gold adsorption from simulated gold mining solution and gold electroplating wastewater were also reported. The NH2-MCM-41 and SH-MCM-41 displayed strong affinity for gold in the solution and both exhibited 100% selectivity for the gold in the binary Au3+/Cu2+ and Au3+/Ni2+ solutions. The NH2-MCM-41 is more suitable for the gold mining solution, while SH-MCM-41 is efficient for gold adsorption from the electroplating waste containing high amount of organics. The gold was recovered as high purity salt solution by elution with mineral acid for NH2-MCM-41 and thiolsulfate for SH-MCM-41. The regenerated adsorbent remained selective to gold and exhibited the same adsorption capacity as the fresh adsorbent. Also, the regenerated adsorbent performed well even after several reuses. [Copyright &y& Elsevier]
- Subjects :
- *GOLD
*SEPARATION (Technology)
*ADSORPTION (Chemistry)
*SURFACE chemistry
Subjects
Details
- Language :
- English
- ISSN :
- 13858947
- Volume :
- 145
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- Chemical Engineering Journal
- Publication Type :
- Academic Journal
- Accession number :
- 34898237
- Full Text :
- https://doi.org/10.1016/j.cej.2008.03.019