Effects of nitrate on the treatment of lead contaminated groundwater by nanoscale zerovalent iron

•Pb(II) removal capacity of nZVI was greatly influenced by nitrate.•Nitrate reduction led to the formation and deformation of Pb-containing ferrite.•ORP can indicate the transformation of nZVI particles and related redox processes.•Shortening reaction time or adding fresh nZVI can reduce the negativ...

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Veröffentlicht in:	Journal of hazardous materials 2014-09, Vol.280, p.504-513
Hauptverfasser:	Su, Yiming, Adeleye, Adeyemi S., Zhou, Xuefei, Dai, Chaomeng, Zhang, Weixian, Keller, Arturo A., Zhang, Yalei
Format:	Artikel
Sprache:	eng
Schlagworte:	Applied sciences Biological and physicochemical phenomena Exact sciences and technology Ferrite process Groundwater - chemistry Groundwaters Iron - chemistry Lead - isolation & purification Lead pollution Nanoscale zerovalent iron Natural water pollution Nitrate influence Nitrates - chemistry Oxidation–reduction potential Pollution Water Pollutants, Chemical - isolation & purification Water treatment and pollution
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Beschreibung
Zusammenfassung:	•Pb(II) removal capacity of nZVI was greatly influenced by nitrate.•Nitrate reduction led to the formation and deformation of Pb-containing ferrite.•ORP can indicate the transformation of nZVI particles and related redox processes.•Shortening reaction time or adding fresh nZVI can reduce the negative effects of nitrate. Nanoscale zerovalent iron (nZVI) is efficient for removing Pb2+ and nitrate from water. However, the influence of nitrate, a common groundwater anion, on Pb2+ removal by nZVI is not well understood. In this study, we showed that under excess Fe0 conditions (molar ratio of Fe0/nitrate>4), Pb2+ ions were immobilized more quickly (
ISSN:	0304-3894 1873-3336
DOI:	10.1016/j.jhazmat.2014.08.040