期刊
JOURNAL OF ENVIRONMENTAL HEALTH SCIENCE AND ENGINEERING
卷 13, 期 -, 页码 -出版社
BIOMED CENTRAL LTD
DOI: 10.1186/s40201-015-0157-3
关键词
nZVI; in-situ; Remediation; Lead; Bench-scale
资金
- Institute of Biotechnology and Environment (IBE) in Sharif University of Technology, Tehran, Iran
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.
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