Exploring the Sorption Mechanism of Ni(II) on Illite: Batch Sorption, Modelling, EXAFS and Extraction Investigations.

ABSTRACT: The sorption mechanism of nickel (Ni) at the illite/water interface was investigated using batch, sorption modelling, extended X-ray absorption fine structure (EXAFS), and extraction approaches. The results showed that Ni(II) sorption on illite was strongly dependent on pH, contact time, temperature, and initial Ni(II) concentration. At a low initial Ni(II) concentration, the ion exchange species of ≡X₂Ni° and the inner-sphere complexes including ≡S^sONi⁺, ≡S^wONi⁺ and ≡S^wONiOH° species are observed on the sorption edges of Ni(II) on illite. As the initial Ni(II) concentration increased to 1.7 × 10^-3 mol/L, precipitates including surface-induced precipitation of s-Ni(OH)₂ and amorphous Ni(OH)₂

SUBMITTER: Zhao X 

PROVIDER: S-EPMC5561197 | biostudies-literature | 2017 Aug

REPOSITORIES: biostudies-literature