FakultätNews und Veranstaltungen
Prof. Andrew Rose: From molecules to minerals: How does ferrihydrite form in aqueous systems?
25 Jul
25. Jul. 2019 | 16:30 Uhr - 18:00 Uhr
ACI-Kolloquium

Prof. Andrew Rose: From molecules to minerals: How does ferrihydrite form in aqueous systems?

Southern Cross University, Lismore, New South Wales, Australia

 

The iron(III) oxyhydroxide mineral ferrihydrite is widespread in many natural and engineered aquatic systems and impacts a range of globally important elemental cycles due to its role in regulating iron bioavailability and in sorbing nutrients and pollutants such as phosphate and arsenate. While the thermodynamic conditions under which ferrihydrite will form are reasonably well known, the mechanism by which it forms is not. Recent studies have suggested a role for non-classical nucleation processes, potentially involving Keggin-type clusters containing both tetrahedrally and octahedrally coordinated iron atoms. In this talk I will propose a general conceptual framework for examining the path from monomeric iron complexes to ferrihydrite mineral in aquatic systems, present some experimental results addressing different aspects of this framework, and identify what I see as critical issues that must be resolved to answer the big question: how does ferrihydrite form in aqueous systems?

Termin

25. Jul. 2019
16:30 Uhr - 18:00 Uhr

Ort

Kleiner Hörsaal ACI
Geb.: 2501
Callinstrasse 1
30167 Hannover
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