Switchable Ionic Liquids: An Environmentally Friendly Medium to Synthesise Nanoparticulate Green Rust

doi:https://doi.org/10.2174/1877944106999160317160621

Title: Switchable Ionic Liquids: An Environmentally Friendly Medium to Synthesise Nanoparticulate Green Rust

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Abstract

Under anoxic conditions, a novel nanoparticulate green rust with carbonate (nano GR) was synthesized by addition of methanol to degassed switchable ionic liquid (SWIL) solution comprised of 1-hexanol, diazabicycloundec-7-ene (DBU), CO2 and Fe(C2H3O2)2 (Fe(OAc)2). Variable temperature Mössbauer spectroscopy studies indicated the product to be predominantly GR while TEM-SAED method confirmed it be nanoparticulate in nature. Experiments with and without methanol in the SWIL medium suggest that methanol may be responsible for Fe(II) oxidation to Fe(III) necessary for GR formation. Studies with Ar instead of CO2 trigger gas indicated that CO2 is essential for GR formation. Conditions to generate CO32- anion was most likely provided by basic environment of the medium. The nano GR suspension was very reactive and instantaneously oxidized completely to a reddish-brown precipitate upon exposure to ambient atmosphere. The nature of the oxidized sample is not certain. The oxidized product, however, appears to be a mix of ferric green rust- [GR(CO32-]*; major] and ferrihydrite-like minerals. To our knowledge, this is first report of use of environmentally-friendly SWIL reagents to synthesize very reactive nano GR materials.

Authors:: Lao, David; Kukkadapu, Ravi; Kovarik, Libor; Arey, Bruce; Heldebrant, David; Nune, Satish

Publication Date:: 2016-06-27

Research Org.:: Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

Sponsoring Org.:: USDOE

OSTI Identifier:: 1290387

Report Number(s):: PNNL-SA-110524
Journal ID: ISSN 1877-9441

DOE Contract Number:: AC05-76RL01830

Resource Type:: Journal Article

Journal Name:: Current Inorganic Chemistry

Additional Journal Information:: Journal Volume: 6; Journal Issue: 2; Journal ID: ISSN 1877-9441

Country of Publication:: United States

Language:: English

Citation Formats


                    Lao, David, Kukkadapu, Ravi, Kovarik, Libor, Arey, Bruce, Heldebrant, David, and Nune, Satish. Switchable Ionic Liquids: An Environmentally Friendly Medium to Synthesise Nanoparticulate Green Rust.  United States: N. p., 2016. 
        Web.  doi:10.2174/1877944106999160317160621.

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                    Lao, David, Kukkadapu, Ravi, Kovarik, Libor, Arey, Bruce, Heldebrant, David, & Nune, Satish. Switchable Ionic Liquids: An Environmentally Friendly Medium to Synthesise Nanoparticulate Green Rust.  United States.  https://doi.org/10.2174/1877944106999160317160621

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                    Lao, David, Kukkadapu, Ravi, Kovarik, Libor, Arey, Bruce, Heldebrant, David, and Nune, Satish. Mon .  
        "Switchable Ionic Liquids: An Environmentally Friendly Medium to Synthesise Nanoparticulate Green Rust".  United States.  https://doi.org/10.2174/1877944106999160317160621.

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@article{osti_1290387,

  title        = {Switchable Ionic Liquids: An Environmentally Friendly Medium to Synthesise Nanoparticulate Green Rust},

  author       = {Lao, David and Kukkadapu, Ravi and Kovarik, Libor and Arey, Bruce and Heldebrant, David and Nune, Satish},

  abstractNote = {Under anoxic conditions, a novel nanoparticulate green rust with carbonate (nano GR) was synthesized by addition of methanol to degassed switchable ionic liquid (SWIL) solution comprised of 1-hexanol, diazabicycloundec-7-ene (DBU), CO2 and Fe(C2H3O2)2 (Fe(OAc)2). Variable temperature Mössbauer spectroscopy studies indicated the product to be predominantly GR while TEM-SAED method confirmed it be nanoparticulate in nature. Experiments with and without methanol in the SWIL medium suggest that methanol may be responsible for Fe(II) oxidation to Fe(III) necessary for GR formation. Studies with Ar instead of CO2 trigger gas indicated that CO2 is essential for GR formation. Conditions to generate CO32- anion was most likely provided by basic environment of the medium. The nano GR suspension was very reactive and instantaneously oxidized completely to a reddish-brown precipitate upon exposure to ambient atmosphere. The nature of the oxidized sample is not certain. The oxidized product, however, appears to be a mix of ferric green rust- [GR(CO32-]*; major] and ferrihydrite-like minerals. To our knowledge, this is first report of use of environmentally-friendly SWIL reagents to synthesize very reactive nano GR materials.},

  doi          = {10.2174/1877944106999160317160621},

  url          = {https://www.osti.gov/biblio/1290387},
  journal      = {Current Inorganic Chemistry},

  issn         = {1877-9441},

  number       = 2,

  volume       = 6,

  place        = {United States},

  year         = {2016},

  month        = {6}

}

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