Extraction of Silver by Glucose

Ananya Baksi; Mounika Gandi; Swathi Chaudhari; Soumabha Bag; Soujit Sen Gupta; Thalappil Pradeep

doi:10.1002/anie.201510122

Extraction of Silver by Glucose

Angew Chem Int Ed Engl. 2016 Jun 27;55(27):7777-81. doi: 10.1002/anie.201510122. Epub 2016 Apr 27.

Authors

Ananya Baksi¹, Mounika Gandi¹, Swathi Chaudhari¹, Soumabha Bag¹, Soujit Sen Gupta¹, Thalappil Pradeep²

Affiliations

¹ Department of Chemistry, DST Unit of Nanoscience (DST UNS) and Thematic Unit of Excellence (TUE), Indian Institute of Technology Madras, Chennai, 600 036, India.
² Department of Chemistry, DST Unit of Nanoscience (DST UNS) and Thematic Unit of Excellence (TUE), Indian Institute of Technology Madras, Chennai, 600 036, India. pradeep@iitm.ac.in.

PMID: 27119514
DOI: 10.1002/anie.201510122

Abstract

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 5×10(8) .

Keywords: extraction of metals; extractive metallurgy; green processes; silver.

Publication types

Research Support, Non-U.S. Gov't