Doktorarbeit
Pyrite formation at ambient temperature – resolving the interplay between microbes, iron minerals, sulfur supplies and associated organics
Betreuer: Stefan Peiffer, Martin Obst, Muammar Mansor
Pyrite formation has been widely investigated because of its abundance and significance in the iron and sulfur cycles in many anoxic environments. The ferric-hydroxide-surface (FHS) pathway is an important pathway for rapid pyrite formation during the sulfidization of ferric (oxyhydr)oxides. In natural systems, Fe(III) minerals are commonly associated with organic matter (OM), and sulfide is typically supplied continuously by sulfate-reducing bacteria. Through batch experiments and in-situ redox monitoring, we investigate how OM and varying sulfide addition modes influence pyrite formation via the FHS pathway, with a focus on associated redox processes, secondary mineral transformations, and electron transfer mechanisms.