Competitive Carboxylate-Silicate Binding at Iron Oxyhydroxide Surfaces.

ABSTRACT: Dissolved silicate ions in wet and dry soils can determine the fate of organic contaminants via competitive binding. While fundamental surface science studies have advanced knowledge of binding in competitive systems, little is still known about the ranges of solution conditions, the time dependence, and the molecular processes controlling competitive silicate-organic binding on minerals. Here we address these issues by describing the competitive adsorption of dissolved silicate and of phthalic acid (PA), a model carboxylate-bearing organic contaminant, onto goethite, a representative natural iron oxyhydroxide nanomineral. Using surface complexation thermodynamic modeling of batch adsorption data and chemometric analyses of vibrational spectra, we find that silicate concentrations represen

SUBMITTER: Cheng W 

PROVIDER: S-EPMC8582244 | biostudies-literature | 2021 Nov

REPOSITORIES: biostudies-literature