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Influence of Magnetite Stoichiometry on the Binding of Emerging Organic Contaminants

While the magnetite stoichiometry (i.e., Fe(II)/Fe(III) ratio) has been extensively studied for the reductive transformation of chlorinated or nitroaromatic compounds, no work exists examining the influence of stoichiometry of magnetite on its binding properties. This study, for the first time, demonstrates that the stoichiometry strongly affects the capacity of magnetite to bind not only quinolone antibiotics such as nalidixic acid (NA) and flumequine (FLU), but also salicylic acid (SA), natural organic matter (humic acid, HA), and dissolved silicates. Fe(II)-amendment of nonstoichiometric magnetite (Fe(II)/Fe(III) = 0.40) led to similar sorbed amounts of NA, FLU, SA, silicates or HA as compared to the stoichiometric magnetite (i.e., Fe(II)/Fe(III) = 0.50). At any pH between 6 and 10, all magnetites exhibiting similar Fe(II)/Fe(III) ratio in the solid phase showed similar adsorption properties for NA or FLU. This enhancement in binding capability of magnetite for NA is still observed in the presence of e...

Authors:   Wei Cheng; Rémi Marsac; Khalil Hanna
Journal:   Environmental Science & Technology
Year:   2017
DOI:   10.1021/acs.est.7b04849
Publication date:   21-Dec-2017
Facts, background information, dossiers
  • magnetite
  • silicates
  • salicylic acid
  • antibiotics
  • adsorption
More about American Chemical Society Publications
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