A new approach to prepare ZVI and its application in removal of Cr(VI) from aqueous solution

Chang, Dongyin, Chen, Tianhu, Liu, Haibo, Xi, Yunfei, Qing, Chengsong, Xie, Qiaoqin, & Frost, Ray L. (2014) A new approach to prepare ZVI and its application in removal of Cr(VI) from aqueous solution. Chemical Engineering Journal, 244, pp. 264-272.

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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.

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6 citations in Web of Science®

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ID Code: 69712
Item Type: Journal Article
Refereed: Yes
Keywords: Goethite, Zero valent iron, Reductive activity, Cr(VI) removal, Heavy metals
DOI: 10.1016/j.cej.2014.01.095
ISSN: 13858947
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Structural Chemistry and Spectroscopy (030606)
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2014 Elsevier B.V.
Deposited On: 03 Apr 2014 01:22
Last Modified: 21 May 2016 09:01

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