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Anatase nanoparticles on supergene platinum–palladium aggregates from Brazil: Titanium mobility in natural waters

2012; Elsevier BV; Volume: 334; Linguagem: Inglês

10.1016/j.chemgeo.2012.10.014

1872-6836

Alexandre Raphael Cabral, Frank Reith, Bernd Lehmann, Joël Brugger, Guido Meinhold, Miguel Tupinambá, Rogerio Kwitko-Ribeiro,

Advanced Photocatalysis Techniques

Supergene aggregates of platinum–palladium (Pt–Pd) intermetallic compounds from the Córrego Bom Sucesso alluvial deposit, Minas Gerais, Brazil, are coated with abundant, poorly crystalline nanoparticles of anatase (TiO2). The anatase coating is widespread, suggesting that the surface of the Pt–Pd grains catalytically destabilised Ti, which was likely dissolved by organic ligands in the ground waters. Association of TiO2 nanocrystallites with organic matter further suggests that biogenic processes could have mediated their formation. These anatase-coated Pt–Pd grains demonstrate an unexpected Ti mobility in supergene environments.