Nanoscale Observation of Nickel(II) Sequestration by Green Rust Sulfate.

ABSTRACT: Green rust (GR) is a mixed-valent Fe-layered double hydroxide (Fe-(II)-Fe-(III)-LDH) mineral that is prevalent in reducing geochemical environments, where it exhibits high sorption and redox reactivity. Here, we examined the morphology and chemistry of individual GR particles with nanoscale resolution in the presence and absence of Ni-(II)_aq at reaction times between 1 h and 3 months using scanning transmission electron microscopy coupled with energy dispersive X-ray spectroscopy (STEM-EDXS). During the first day of reaction, sorbed Ni-(II) accumulated alongside Fe in ∼10 nm thick rims around the GR particle edges, consistent with the formation of mixed Ni-(II)/Fe-(II)-Fe-(III)-LDH. After 3 months, the rims were thinner and contained less Ni-(II) despite a doubling of the sorbed

SUBMITTER: Alam KMN 

PROVIDER: S-EPMC12641539 | biostudies-literature | 2025 Nov

REPOSITORIES: biostudies-literature