Promoting nitrate reduction kinetics by nanoscale zero valent iron in water via copper salt addition

Ahmed M.E. Khalil, Osama Eljamal, Skander Jribi, Nobuhiro Matsunaga

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

Several methods were proposed to enhance nitrate reduction kinetics and removal from water by nanoscale zero valent iron (Fe 0 ). One of them was the addition of other contaminants/components to nitrate-contaminated water, which is less common, but it can gain effective results and promote nitrate reduction kinetics. In this study, nano-Fe 0 was synthesized under optimum conditions and characterized using transmission electron microscopy, surface area analyzer, X-ray diffraction and particle size analyzer. Nitrate removal performance was carefully investigated via batch experiments under different conditions of pH, presence/absence of oxygen and distinctive nitrate concentrations (50, 100, 200, 300, and 500mg/L), comparing between nitrate removal by nano-Fe 0 with and without copper salt (copper chloride) addition. Optimum addition ratio of CuCl 2 /Fe (0.05wt/wt) was collected from experimental results, which was used to conduct the rest of batch experiments. Kinetics of nitrate removal among several batch experiments were examined by applying different models, and it was found that most profiles obeyed first-order rate equation. The presence of copper ions during nitrate reduction imposes two electrochemical reactions; one stimulates iron corrosion and another reaction causes hydrogen-electrocatalytic reduction of nitrate. Both reactions boosted removal efficiency and kinetics around 3.5 times more than that by ordinary pristine nano-Fe 0 alone, i.e. nitrate removal time was reduced from one hour to 20min. Moreover, the stability of removal efficiency and kinetics under the influence of pH and dissolved oxygen was higher as well.

Original languageEnglish
Pages (from-to)367-380
Number of pages14
JournalChemical Engineering Journal
Volume287
DOIs
Publication statusPublished - Mar 1 2016

Fingerprint

Nitrates
Copper
Iron
Salts
nitrate
copper
salt
kinetics
Kinetics
Water
water
iron nanoparticle
experiment
Experiments
Dissolved oxygen
removal
Chlorides
transmission electron microscopy
corrosion
Hydrogen

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

Cite this

Promoting nitrate reduction kinetics by nanoscale zero valent iron in water via copper salt addition. / Khalil, Ahmed M.E.; Eljamal, Osama; Jribi, Skander; Matsunaga, Nobuhiro.

In: Chemical Engineering Journal, Vol. 287, 01.03.2016, p. 367-380.

Research output: Contribution to journalArticle

Khalil, Ahmed M.E. ; Eljamal, Osama ; Jribi, Skander ; Matsunaga, Nobuhiro. / Promoting nitrate reduction kinetics by nanoscale zero valent iron in water via copper salt addition. In: Chemical Engineering Journal. 2016 ; Vol. 287. pp. 367-380.
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