Facet-dependent adsorption and fractionation of natural organic matter on crystalline metal oxide nanoparticles

Environmental Science & Technology
Zelin ShenWei Chen

Abstract

Natural organic matter (NOM) and crystalline metal oxide nanoparticles are both prevalent in natural aquatic environment and their interactions have important environmental and biogeochemical implications. Here, we show that these interactions are significantly affected by an intrinsic property of metal oxide nanocrystals, the exposed facets. Both anatase (TiO2) and hematite (α-Fe2O3) nanocrystals, representing common engineered and naturally-occurring metal oxides, exhibited apparent facet-dependent adsorption of humic acid and fulvic acid. This facet-dependent binding was primarily driven by surface complexation between the NOM carboxyl groups and surficial metal atoms. Thus, the adsorption affinity of different-faceted nanocrystals was determined by the atomic arrangements of crystal facets that controlled the activity of metal atoms and consequently, the ligand exchange and binding configuration of the carboxyl groups in the first hydration shell of nanocrystals. Distinct facet-dependent fractionation patterns were observed during adsorption of NOM components, particularly the low-molecular-weight and photo-refractory constituents. The molecular fractionation of NOM between water and metal oxide nanoparticles was dictated b...Continue Reading

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