%0 Journal Article
%T Efficiency of Crude <i>¦Á</i>-Cyclodextrin in Gold Recovery from Electronic Waste and Soil
%A Ibrahim Karume
%A Simon Tewolde
%A Emmanuel Tebandeke
%A Is¡¯harq Z. T. Mukasa
%A Ruth Mbabazi
%J Green and Sustainable Chemistry
%P 73-82
%@ 2160-696X
%D 2022
%I Scientific Research Publishing
%R 10.4236/gsc.2022.123006
%X In this study, the metal coordination ability of
alpha-cyclodextrin (<i>¦Á</i>-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 <i>¦Á</i>-CD used was extracted
from cassava and yam starch of the non-edible plant species using <i>E.</i><span> <i>coli</i></span> <i>¦Á</i>-cyclodextrin
glucanotransferase (<i>¦Á</i>-CGTase), with yields ¡Ý 62%. The reaction was
monitored progressively by ultraviolet-visible spectroscopy and checked with
infrared spectroscopy (IR) for the presence of <i>¦Á</i>-CD. The crude <i>¦Á</i>-CD
extract without need for purification was refluxed with gold containing-electronic
waste and soil predigested in a mixture of NaBr/HNO<sub>3</sub> 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 <i>¦Á</i>-CD.
This approach is cheap, effective, and environmentally benign.
%K Starch
%K &lt
%K i&gt
%K ¦Á&lt
%K /i&gt
%K -Cyclodextrin
%K Electronic Waste
%K Soil
%K Gold
%U http://www.scirp.org/journal/PaperInformation.aspx?PaperID=119260