Nitrate reduction over nanoscale zero-valent iron prepared by hydrogen reduction of goethite
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03/01/2012
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Resumo |
Nitrate reduction with nanoscale zero-valent iron (NZVI) was reported as a potential technology to remove nitrate from nitrate-contaminated water. In this paper, nitrate reduction with NZVI prepared by hydrogen reduction of natural goethite (NZVI-N, -N represents natural goethite) and hydrothermal goethite (NZVI-H, -H represents hydrothermal goethite) was conducted. Besides, the effects of reaction time, nitrate concentration, iron-to-nitrate ratio on nitrate removal rate over NZVI-H and NZVI-N were investigated. To prove their excellent nitrate reduction capacities, NZVI-N and NZVI-H were compared with ordinary zero-valent iron (OZVI-N) through the static experiments. Based on all above investigations, the mechanism of nitrate reduction with NZVI-N was proposed. The result showed that reaction time, nitrate concentration, iron-to-nitrate ratio played an important role in nitrate reduction by NZVI-N and NZVI-H. Compared with OZVI, NZVI-N and NZVI-H showed little relationship with pH. And NZVI-N for nitrate composition offers a higher stability than NZVI-H because of the existence of Al-substitution. Furthermore, NZVI-N, prepared by hydrogen reduction of goethite, has higher activity for nitrate reduction and the products contain hydrogen, nitrogen, NH 4 +, a little nitrite, but no NOx, meanwhile NZVI-N was oxidized to Fe 2+. It is a relatively easy and cost-effective method for nitrate removal, so NZVI-N reducing nitrate has a great potential application in nitrate removal of groundwater. © 2012 Elsevier B.V. |
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application/pdf |
Identificador | |
Publicador |
Elsevier B.V. |
Relação |
http://eprints.qut.edu.au/51503/2/51503.pdf DOI:10.1016/j.matchemphys.2012.01.008 Liu, H. B., Chen, T. H., Chang, D. Y., Chen, D., Liu, Y., He, H. P., Yuan, P., & Frost, R. L. (2012) Nitrate reduction over nanoscale zero-valent iron prepared by hydrogen reduction of goethite. Materials Chemistry and Physics, 133(1), pp. 205-211. |
Direitos |
Copyright 2012 Elsevier B.V. All rights reserved. |
Fonte |
School of Chemistry, Physics & Mechanical Engineering; Science & Engineering Faculty |
Palavras-Chave | #Al-substituted goethite #Groundwater #Nanoscale zero-valent iron #Natural goethite #Nitrate reduction #Al-substitution #Cost-effective methods #Hydrogen reduction #Nitrate concentration #Nitrate removal #Potential applications #Potential technologies #Static experiments #Zero-valent iron #Aluminum #Hydrogen #Iron #Nanotechnology #Nitrates #Nitrogen removal |
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Journal Article |