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The Chemical Educator

ISSN: 1430-4171 (electronic version)

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Abstract Volume 22 (2017) pp 135-136

Recovering Bulk Gold From Scrap Electronics to Synthesize Gold Colloids

Mathias Jacobs, Ben Meynaerts, Natalie Chiaverini and Tom Mortier*

Faculty of Management and Technology, University Colleges Leuven-Limburg, Herestraat 49, 3000 Leuven, Belgium,
Received January 18, 2017. Accepted August 7, 2017.

Published: 11 August 2017

Abstract. We report the synthesis of starch stabilized gold colloids starting from bulk gold being recovered from scrap electronics such as integrated circuits or chips. The bulk gold was rinsed with concentrated nitric acid and subsequently dissolved in aqua regia. After the evaporation of the acidic solution, the yellow gold salt was dissolved in demineralized water and characterized by UV/Vis spectroscopy. Ruby red gold sols were prepared by adding starch to the chloride ligand stabilized gold(III) solution and reduced by adding trisodiumcitrate. The gold sols were characterized with UV/Vis spectroscopy.

Key Words: Laboratories and Demonstrations; physical chemistry; nanotechnology; gold colloids; UV/Vis spectroscopy

(*) Corresponding author. (E-mail:

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