Nitrate reduction by chelating resin‐supported Fe and Fe/Ni nanoparticles: comparison of reactivity and effect of co‐existing inorganic anion

BACKGROUND: Nitrate is a potential harmful contaminant to humans, and widely detected in ground and surface water. The aim of this study was to accelerate nitrate reduction using chelating resin‐supported Fe/Ni nanoparticles. RESULTS: The results of X‐ray diffraction indicated that the presence of N...

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Bibliographic Details
Published in:Journal of chemical technology and biotechnology (1986) 2016, Vol.91 (1), p.212-218
Main Authors: Shi, Jialu, He, Honglei, Long, Chao, Li, Aimin
Format: Article
Language:English
Subjects:
Anions
bicarbonates
bimetallic Fe/Ni nanoparticles
catalytic activity
chelating resin
chlorides
drinking water
humans
Humic acids
Iron
Magnesium
monometallic nanoscale iron
Nanoparticles
Nickel
nitrate
nitrate reduction
Nitrates
oxidation
oxygen
phosphates
Reduction
sulfates
surface water
X-ray diffraction
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Summary:BACKGROUND: Nitrate is a potential harmful contaminant to humans, and widely detected in ground and surface water. The aim of this study was to accelerate nitrate reduction using chelating resin‐supported Fe/Ni nanoparticles. RESULTS: The results of X‐ray diffraction indicated that the presence of Ni can prevent the oxidation of nanoscale Fe⁰ particles by O₂. The nitrate removal efficiency (98.3%) and the rate constant (Kₒbₛ = 0.0166 mg⁻¹ L min⁻¹) using supported Fe/Ni nanoparticles were increased greatly compared with those using supported Fe nanoparticles (21.3% and 7.93 × 10⁻⁴ mg⁻¹ L min⁻¹, respectively). The co‐existing Cl⁻ caused a slight increase in nitrate reduction by the supported Fe nanoparticles, but SO₄ ² ⁻, PO₄ ³ ⁻, HCO₃ ⁻ and humic acid caused obvious inhibition of NO₃ ⁻ removal. Due to Ni catalysis, however, the effects of these co‐existing anions and humic acid on nitrate reduction by supported Fe/Ni nanoparticles could be ignored, except HCO₃ ⁻. Moreover, the Fe/Ni nanoparticles showed good performance for nitrate reduction in drinking water. CONCLUSION: The supported Fe/Ni nanoparticles were more reactive than Fe nanoparticles. The co‐existing anions and humic acid showed less effect on nitrate reduction. The supported Fe/Ni nanoparticles have a potential application for nitrate reduction. © 2014 Society of Chemical Industry
ISSN:0268-2575
1097-4660
DOI:10.1002/jctb.4564