title: Mechanism of gold adsorption by persimmon tannin gel.
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.
authors.affiliation: Department of Chemistry, Faculty of Medicine, Miyazaki Medical College, Kiyotake, Miyazaki 889-1692, Japan.
authors.forename: Akira
authors.initials: A
authors.lastname: Nakajima
authors.forename: Kaoru
authors.initials: K
authors.lastname: Ohe
authors.forename: Yoshinari
authors.initials: Y
authors.lastname: Baba
authors.forename: Tsuyoshi
authors.initials: T
authors.lastname: Kijima
mesh_terms: D000327:Adsorption; D029788:Diospyros / Q000737:chemistry*; D005782:Gels / Q000737:chemistry*; D006046:Gold / Q000737:chemistry*; D013634:Tannins / Q000737:chemistry*
chemical_list: D005782:Gels; D013634:Tannins; D006046:Gold