期刊
CHEMICAL ENGINEERING JOURNAL
卷 244, 期 -, 页码 264-272出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2014.01.095
关键词
Goethite; Zero valent iron; Reductive activity; Cr(VI) removal; Heavy metals
资金
- Natural Science Foundation of China [41372045, 41130206, 41072036, 41172048]
- Ph.D. Programs Foundation of Ministry of Education of China [20110111110003]
- Anhui Province Land and Resources Science and Technology Project [2012-K-18]
Zero valent iron (ZVI) was prepared by reducing natural goethite (NG-ZVI) and synthetic goethite (SG-ZVI) in hydrogen at 550 C. XRD, TEM, FESEM/EDS and specific surface area (SSA) and pore analyser were used to characterize goethites and reduced goethites. Both NG-ZVI and SG-ZVI with a size of nanoscale to several hundreds of nanometers were obtained by reducing goethites at 550 C. The reductive capacity of the ZVIs was assessed by removal of Cr(VI) at ambient temperature in comparison with that of commercial iron powder (CIP). The effect of contact time, initial concentration and reaction temperature on Cr(VI) removal was investigated. Furthermore, the uptake mechanism was discussed according to isotherms, thermodynamic analysis and the results of XPS. The results showed that SG-ZVI had the best reductive capacity to Cr(VI) and reduced Cr(VI) to Cr(III). The results suggest that hydrogen reduction is a good approach to prepare ZVI and this type of ZVI is potentially useful in remediating heavy metals as a material of permeable reaction barrier. (C) 2014 Elsevier B.V. All rights reserved.
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