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Published on: June 28, 2019
Mechanism of gold adsorption by persimmon tannin gel
Akira Nakajima1, Kaoru Ohe, Yoshinari Baba
1Department of Chemistry, Faculty of Medicine, Miyazaki Medical College, Kiyotake, Miyazaki 889-1692, Japan.
Abstract:
Gold adsorption by persimmon tannin (PT) gel from a solution containing hydrogen tetrachloroaurate(III) was examined. A flow-rate examination in a column system indicated the reduction of Au(III) ion to Au(0). XRD patterns clarified the existence of Au(0) on the gel which adsorbed gold. The gel could also adsorb colloidal Au(0) prepared independently. A model consisting of ligand exchange, Au(III) reduction to Au(0), and resulting Au(0) adsorption by PT gel was presented for the gold adsorption mechanism.

