Speciation Controls the Kinetics of Iron Hydroxide Precipitation and Transformation at Alkaline pH.

ABSTRACT: The formation of energetically favorable and metastable mineral phases within the Fe-H₂O system controls the long-term mobility of iron complexes in natural aquifers and other environmentally and industrially relevant systems. The fundamental mechanism controlling the formation of these phases has remained enigmatic. We develop a general partial equilibrium model, leveraging recent synchrotron-based data on the time evolution of solid Fe(III) hydroxides along with aqueous complexes. We combine thermodynamic considerations and particle-morphology-dependent kinetic rate equations under full consideration of the aqueous phase in disequilibrium with one or more of the forming minerals. The new model predicts the rate of amorphous 2-line ferrihydrite precipitation, dissolution, and o

SUBMITTER: Furcas FE 

PROVIDER: S-EPMC11542892 | biostudies-literature | 2024 Nov

REPOSITORIES: biostudies-literature