Extraction of Silver by Glucose

Unprecedented silver ion leaching, in the range of 0.7 ppm was seen when metallic silver was heated in water at 70 °C in presence of simple carbohydrates, such as glucose, making it a green method of silver extraction. Extraction was facilitated by the presence of anions, such as carbonate and phosp...

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Bibliographic Details
Published in:Angewandte Chemie International Edition 2016-06, Vol.55 (27), p.7777-7781
Main Authors: Baksi, Ananya, Gandi, Mounika, Chaudhari, Swathi, Bag, Soumabha, Gupta, Soujit Sen, Pradeep, Thalappil
Format: Article
Language:English
Subjects:
extraction of metals
extractive metallurgy
green processes
silver
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Summary:Unprecedented silver ion leaching, in the range of 0.7 ppm was seen when metallic silver was heated in water at 70 °C in presence of simple carbohydrates, such as glucose, making it a green method of silver extraction. Extraction was facilitated by the presence of anions, such as carbonate and phosphate. Studies confirm a two‐step mechanism of silver release, first forming silver ions at the metal surface and later complexation of ionic silver with glucose; such complexes have been detected by mass spectrometry. Extraction leads to microscopic roughening of the surface making it Raman active with an enhancement factor of 5×108. A spoon full of sugar… Direct silver extraction from metallic silver using glucose is possible. The dissolution of silver occurs in the ionic form and consequent complexation with glucose facilitates more silver leaching into the solution. The leaching is strongly dependent on the counter anion present in the solution. Dissolution of silver leads to microscopic roughening on the surface making it SERS active.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.201510122