Natural organic matter (NOM) may impact the reactivity of iron containing nanoparticles used for contaminant remediation. In this work, the adsorption of NOM and its impact on nanoparticle aggregation and rate of 4-chloronitrobenzene degradation were evaluated for adsorbed Fe(II) on goethite nanoparticles. NOM adsorption was characterized using excitation emission matrix fluorescence spectroscopy, and NOM fractionation was observed in some cases. Evolving reactivity was explored through consecutive additions of Fe(II) and 4-chloronitrobenzene. The kinetics of degradation were slowest for reactors prepared with NOM, and rates became progressively slower with further additions of Fe(II) and 4-chloronitrobenzene. Finally, goethite length and width measurements reveal that the addition of NOM not only slows reaction rates but also affects the relative reactivity of different crystal surfaces. These results reveal new insight into the reactive surface sites of goethite and the influence of NOM in iron nanoparticle remediation methods.

Influence of natural organic matter on contaminant remediation by iron oxides with adsorbed Fe(II)

251st National Meeting (2016)

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