Insights into aqueous reduction of Cr(VI) by Fe3O4@NOM MNPs under irradiation: The role of carbonyl structures
2019
Xie, Pengfei | Ma, Jiahai
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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