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- Title
Kinetics of nitrate reductive denitrification by nanoscale zero-valent iron.
- Authors
Jinghui Zhang; Zhiwei Hao; Zhen Zhang; Yueping Yang; Xinhua Xu
- Abstract
Nanoscale zero-valent iron (Fe was synthesized for nitrate denitrification. The reduction efficiency of nitrate decreased quickly with increasing initial pH value, increased considerably with the increasing dosage of nanoscale Fe0 and did not vary much with initial nitrate concentrations changing from 20 to 50mg1-1 when the excessive amount of nanoscale Fe0was utilized. With reductive denitrification of nitrate by nanoscale Fe0 the removal rate of nitrate reached 96.4% in 30 min with nanoscale Fe0 dosage of 1.0 gI-1 and pHin 6.7, and more than 85% of the nitrate was transformed into ammonia. Kinetics analysis in batch studies demonstrates that the denitrification of nitrate by nanoscale Fe involves reaction on the metal surface, which fits well the pseudo-first order reaction with respect to nitrate concentration. The observed reaction rate constant of reductive denitrification of nitrate was determined to be 0.086min-1 with a nanoscale Fe dosage of 1.0gl-1 and pHin 6.7. Fast and highly effective denitrification can be achieved by nanoscale Fe0 compared with commercial Fe powder, this is due to the extremely high surface area and high reactivity for nanoscale Fe0 which can enhance the denitrification efficiencies remarkably.
- Subjects
NITRATES; DENITRIFICATION; NITROGEN compounds &; the environment; NANOCHEMISTRY; CHEMICAL reduction; PROCESS safety management; ENVIRONMENTAL protection
- Publication
Process Safety & Environmental Protection: Transactions of the Institution of Chemical Engineers Part B, 2010, Vol 88, Issue 6, p439
- ISSN
0957-5820
- Publication type
Article
- DOI
10.1016/j.psep.2010.06.002