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In-situ Pb2+ remediation using nano iron particles

Fadaei Tehrani, M. R ; Sharif University of Technology | 2015

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  1. Type of Document: Article
  2. DOI: 10.1186/s40201-015-0157-3
  3. Publisher: BioMed Central Ltd , 2015
  4. Abstract:
  5. Originally, application of nano zero valent iron (nZVI) particles for the removal of lead (Pb2+) in porous media was studied. At first, stabilized nZVI (S-nZVI) was prepared and characterized, then used in batch and continuous systems. Based on the batch experiments, corresponding reaction kinetics well fitted with the pseudo-first-order adsorption model, and reaction rate ranged from 0.01 to 0.04 g/mg/min depend on solution pH and the molar ratio between Fe and Pb. In batch tests, optimal condition with more than 90% removal efficiency at 60 min was observed at a pH range of 4 to 6 and Fe/Pb ratio more than 2.5. Continuous experiments exposed that Pb2+ remediation was as well influenced by seepage velocity, grain size, and type of porous media. The maximum Pb2+ removal efficiency in batch and bench-scale systems were 97% and 81%, correspondingly. The results have shown the ability of S-nZVI to use in permeable reactive barriers, as an efficient adsorbent for Pb2+, because of its excellent stability, high reducing power, and a large surface area
  6. Keywords:
  7. Bench-scale ; In-situ ; NZVI ; Remediation ; Adsorption ; In situ test ; Iron ; Lead ; Porous medium ; Reaction kinetics ; Reaction rate
  8. Source: Journal of Environmental Health Science and Engineering ; Volume 13, Issue 1 , 2015 ; 2052336X (ISSN)
  9. URL: http://jehse.biomedcentral.com/articles/10.1186/s40201-015-0157-3