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https://doi.org/10.1016/j.tifs.2013.11.005

has been cited by the following article:

• TITLE: Efficiency of Crude α-Cyclodextrin in Gold Recovery from Electronic Waste and Soil

  AUTHORS: Ibrahim Karume, Simon Tewolde, Emmanuel Tebandeke, Is’harq Z. T. Mukasa, Ruth Mbabazi

  KEYWORDS: Starch, α-Cyclodextrin, Electronic Waste, Soil, Gold

  JOURNAL NAME: Green and Sustainable Chemistry, Vol.12 No.3, August 19, 2022

  ABSTRACT: In this study, the metal coordination ability of alpha-cyclodextrin (α-CD) was employed to complex gold and thus isolate and extract it from different matrices of acid-digests of electronic waste and soil. The crude α-CD used was extracted from cassava and yam starch of the non-edible plant species using E. coli α-cyclodextrin glucanotransferase (α-CGTase), with yields ≥ 62%. The reaction was monitored progressively by ultraviolet-visible spectroscopy and checked with infrared spectroscopy (IR) for the presence of α-CD. The crude α-CD extract without need for purification was refluxed with gold containing-electronic waste and soil predigested in a mixture of NaBr/HNO3 for 4 - 7 days. Recoveries of up to 22.9% and 70.8% gold were achieved from electronic waste and soil, respectively using 0.1 M α-CD. This approach is cheap, effective, and environmentally benign.