Journal
MATERIALS CHEMISTRY AND PHYSICS
Volume 133, Issue 1, Pages 205-211Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2012.01.008
Keywords
Natural goethite; Nanoscale zero-valent iron; Nitrate reduction; Groundwater; Al-substituted goethite
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Funding
- Natural Science Foundation of China [41102023, 41072035]
- Ph.D. Programs Foundation of Ministry of Education of China [20110111110003]
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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, NH4+, a little nitrite, but no NOx, meanwhile NZVI-N was oxidized to Fe2+. 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. (C) 2012 Elsevier B.V. All rights reserved.
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