Kinetics of reductive denitrification by nanoscale zero-valent iron

Seunghee Choe, Yoon Young Chang, Kyung Yub Hwang, Jeehyeong Khim

Research output: Contribution to journalArticle

323 Citations (Scopus)

Abstract

Zero-valent iron powder (Fe0) has been determined to be potentially useful for the removal of nitrate in the water environment. This research is aimed at subjecting the kinetics of denitrification by nanoscale Fe0 to an analysis of factors affecting the chemical denitrification of nitrate. Nanoscale iron particles with a diameter in the range of 1-100 nm, which are characterized by the large BET specific surface area to mass ratio (31.4 m2/g), removed mostly 50, 100, 200, and 400 mg/l of nitrate within a period of 30 min with little intermediates. Compared with microscale (75-150 μm) Fe0, endproduct is not ammonia but N2 gas. Kinetics analysis from batch studies revealed that the denitrification reaction with nanoscale Fe0 appeared to be a pseudo first-order with respect to substrate and the observed reaction rate constant (k(obs)) varied with iron content at a relatively low degree of application. The effects of mixing intensity (rpm) on the denitrification rate suggest that the denitrification appears to be coupled with oxidative dissolution of iron through a largely mass transport- limited surface reaction (< 40 rpm). (C) 2000 Elsevier Science Ltd.

Original languageEnglish
Pages (from-to)1307-1311
Number of pages5
JournalChemosphere
Volume41
Issue number8
DOIs
Publication statusPublished - 2000 Oct

Keywords

  • Denitrification
  • Iron content
  • Mixing intensity
  • Nanoscale Fe
  • Pseudo first-order

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Chemistry(all)
  • Pollution
  • Health, Toxicology and Mutagenesis

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