The role of magnetite nanoparticles in the reduction of nitrate in groundwater by zero-valent iron

Cho, Dong-Wan; Song, Hocheol; Schwartz, Franklin W.; Kim, Bokseong; Jeon, Byong‐Hun

doi:10.1016/j.chemosphere.2015.01.019

Cited by 59 publications

(19 citation statements)

References 35 publications

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“…1S in Supplementary Materials. The results indicated N mass balance of 84.0-100.2 % for the two types of reactors, which is consistent with the result of previous study (86.5-109.9 %) (Cho et al 2015). This relatively high mass balance suggests that ammonia volatilization occurred to some extent, but it was not very significant.…”

Section: Nitrate Reduction By Fe(0)/nmt and Fmabsupporting

confidence: 93%

“…Fe(0) and NMT tend to form aggregates due to their large size difference and magnetic properties. The rate enhancing effect of magnetite in ZVI reactions has been reported in several past investigations (Wu et al 2009;Lv et al 2012;Xu et al 2012;Cho et al 2015). These studies commonly observed rate enhancement by magnetite and attributed it to electron-mediating capability of magnetite, which arises from its high conductivity (10 2 -10 3 Ω −1 cm −1 ) and small band gap energy (0.1 eV) (Leland and Bard 1987).…”

Section: Effect Of Varying the Mass Of Fe(0) And Nmt In Fmabmentioning

confidence: 90%

“…To address this issue, several studies have investigated the utilities of several additive materials in alleviating pH rise or enhancing Fe(0) reactivity (Cho et al 2010;Oh et al 2007;Pan et al 2012;Song et al 2013). For example, magnetite nanoparticles added to a Fe(0) system have been shown to greatly improve the rate of nitrate and chromate, as well as lifetime of Fe(0) (Cho et al 2015;Lv et al 2012). It was presumed that magnetite particles bind to Fe(0) surface and form localized electron-mediating sites that facilitated electron transfer to nitrate ions.…”

Section: Introductionmentioning

confidence: 98%

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Reduction of Nitrate in Groundwater by Fe(0)/Magnetite Nanoparticles Entrapped in Ca-Alginate Beads

Cho

Kim

Schwartz

et al. 2015

Water Air Soil Pollut

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Calcium alginate beads entrapping a mixture of Fe(0) and nanosized magnetite (NMT) were prepared and evaluated for their capability to reduce nitrate in groundwater. Microscopic and spectroscopic analyses of the beads revealed that clusters of Fe(0)/NMT were entirely embedded in alginate polymer matrix containing a large number of carboxylic and hydroxyl functional groups. The extent of nitrate reduction increased with increasing content of Fe(0) and NMT in the beads, but there was a critical NMT mass limit relative to Fe(0) mass where no further increase in nitrate reduction occurred. The beads showed slower nitrate reduction kinetics than bare Fe(0)/NMT but had comparable capacity in overall nitrate removal. Nitrate reduction increased proportionally with an increase in bead dosage to give a maximum removal of 94.5 % at 37.5 g L −1 in 48 h. Nitrate reduction with 50 g L −1 beads achieved completion of two reduction cycles in 72 h to reduce 2.19 mM nitrate to less than 0.71 mM (10 mg-N L −1 ) in each cycle. The overall results demonstrated that the beads developed in this study have a potential utility in remediation of nitrate in groundwater.

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Section: Nitrate Reduction By Fe(0)/nmt and Fmabsupporting

confidence: 93%

Section: Effect Of Varying the Mass Of Fe(0) And Nmt In Fmabmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 98%

See 1 more Smart Citation

Reduction of Nitrate in Groundwater by Fe(0)/Magnetite Nanoparticles Entrapped in Ca-Alginate Beads

Cho

Kim

Schwartz

et al. 2015

Water Air Soil Pollut

Self Cite

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show abstract

“…In addition, it has been reported that Fe 2+ on the surface of Fe 3+ oxides can catalyze the transformation of amorphous Fe 3+ oxides or goethite to magnetite [23,32]. It is assumed that the semiconductive magnetite layer allows electron transfer from Fe 0 to nitrate [17,33] and other contaminants [23] [34][35][36]. However, there have been no reports to confirm whether this spontaneous electron transfer behavior can catalyze electron transfer from Fe 0 to nitrate.…”

Section: Introductionmentioning

confidence: 97%

“…Recently, various modified Fe 0 by microbes [16], Fe oxides [17], minerals [18] and organic carbon [19] was used to improve the degradation effect of nitrate. It was found that the reductive efficiency of nitrate by Fe 0 increased as the concentration of dissolved ferrous ion (Fe 2+ aq ) increased in solution [20,21].…”

Section: Introductionmentioning

confidence: 99%

Sustaining reactivity of Fe0 for nitrate reduction via electron transfer between dissolved Fe2+ and surface iron oxides

Han

Yang

Wang

et al. 2016

Journal of Hazardous Materials

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High‐Performance Ammonia Electrosynthesis from Nitrate in a NaOH−KOH−H₂O Ternary Electrolyte

Shahid,

Kwon,

Yuan

et al. 2024

Angewandte Chemie

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A glut of dinitrogen‐derived ammonia (NH3) over the past century has resulted in a heavily imbalanced nitrogen cycle and consequently, the large‐scale accumulation of reactive nitrogen such as nitrates in our ecosystems has led to detrimental environmental issues. Electrocatalytic upcycling of waste nitrogen back into NH3 holds promise in mitigating these environmental impacts and reducing reliance on the energy‐intensive Haber‐Bosch process. Herein, we report a high‐performance electrolyzer using an ultrahigh alkalinity electrolyte, NaOH‐KOH‐H2O, for low‐cost NH3 electrosynthesis. At 3,000 mA/cm2, the device with a Fe‐Cu‐Ni ternary catalyst achieves an unprecedented faradaic efficiency (FE) of 92.5±1.5% under a low cell voltage of 3.83 V; whereas at 1,000 mA/cm2, an FE of 96.5±4.8% under a cell voltage of only 2.40 V. Techno‐economic analysis revealed that our device cuts the levelized cost of ammonia electrosynthesis by ~40% ($30.68 for Fe‐Cu‐Ni vs. $48.53 for Ni foam per kmol‐NH3). The NaOH‐KOH‐H2O electrolyte together with the Fe‐Cu‐Ni ternary catalyst can enable the high‐throughput nitrate‐to‐ammonia applications for affordable and scalable real‐world wastewater treatments.

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The role of magnetite nanoparticles in the reduction of nitrate in groundwater by zero-valent iron

Cited by 59 publications

References 35 publications

Reduction of Nitrate in Groundwater by Fe(0)/Magnetite Nanoparticles Entrapped in Ca-Alginate Beads

Reduction of Nitrate in Groundwater by Fe(0)/Magnetite Nanoparticles Entrapped in Ca-Alginate Beads

Sustaining reactivity of Fe0 for nitrate reduction via electron transfer between dissolved Fe2+ and surface iron oxides

High‐Performance Ammonia Electrosynthesis from Nitrate in a NaOH−KOH−H₂O Ternary Electrolyte

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The role of magnetite nanoparticles in the reduction of nitrate in groundwater by zero-valent iron

Cited by 59 publications

References 35 publications

Reduction of Nitrate in Groundwater by Fe(0)/Magnetite Nanoparticles Entrapped in Ca-Alginate Beads

Reduction of Nitrate in Groundwater by Fe(0)/Magnetite Nanoparticles Entrapped in Ca-Alginate Beads

Sustaining reactivity of Fe0 for nitrate reduction via electron transfer between dissolved Fe2+ and surface iron oxides

High‐Performance Ammonia Electrosynthesis from Nitrate in a NaOH−KOH−H2O Ternary Electrolyte

Contact Info

Product

Resources

About

High‐Performance Ammonia Electrosynthesis from Nitrate in a NaOH−KOH−H₂O Ternary Electrolyte