Abstract
This study investigates the active sites in natural organic matter (NOM) that are important for the removal of Cr(VI), by using Fe3O4 magnetic nanoparticles (MNPs) modified by NOM (Fe3O4@NOM). NaBH4 is used to selectively reduce carbonyl groups in Fe3O4@NOM MNPs to demonstrate the role of carbonyl structures in the reduction of Cr(VI), especially under irradiation. Results observed using NOM and low molecular weight compounds further demonstrated that carbonyl structures in Fe3O4@NOM MNPs, especially aromatic ketones, can strongly promote Cr(VI) reduction. This phenomenon corresponds well to a model in which charge transfer interactions occur between donors and acceptors in NOM.
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