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  • Enhanced removal of trace Cr(VI) from neutral and alkaline aqueous solution by FeCo bimetallic nanoparticle

    Author(s)
    Qin, Nannan
    Zhang, Ya
    Zhou, Hongjian
    Geng, Zhigang
    Liu, Gang
    Zhang, Yunxia
    Zhao, Huijun
    Wang, Guozhong
    Griffith University Author(s)
    Zhao, Huijun
    Year published
    2016
    Metadata
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    Abstract
    The reactivity of zero valent iron (Fe0) for removing Cr(VI) is self-inhibiting under neutral and alkaline conditions, due to the precipitation of ferrous hydroxide on the surface of Fe0. To overcome this difficulty, we incorporated a second metal (Co) into Fe0 to form FeCo bimetallic nanoparticles (FeCo BNPs), which can achieve higher activity and significant improvement in the reaction kinetics for the removal of Cr(VI) compared with Fe0. The FeCo BNPs were synthesized by a hydrothermal reduction method without using any templates. The characterization analysis indicated that the products were highly uniform in large scale ...
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    The reactivity of zero valent iron (Fe0) for removing Cr(VI) is self-inhibiting under neutral and alkaline conditions, due to the precipitation of ferrous hydroxide on the surface of Fe0. To overcome this difficulty, we incorporated a second metal (Co) into Fe0 to form FeCo bimetallic nanoparticles (FeCo BNPs), which can achieve higher activity and significant improvement in the reaction kinetics for the removal of Cr(VI) compared with Fe0. The FeCo BNPs were synthesized by a hydrothermal reduction method without using any templates. The characterization analysis indicated that the products were highly uniform in large scale with 120–140 nm size in diameter. The obtained FeCo BNPs exhibited a remarkable removal ability for Cr(VI) in the pH range of 5.3–10.0. Especially, FeCo BNPs were able to reduce trace Cr(VI) (1.0 mg L−1, pH = 7.5) down to about 0.025 mg L−1 within 1 h. XPS analysis confirmed that Cr(VI) was reduced to Cr(III) by FeCo BNPs, while Fe and Co was oxidized, implying a chemical reduction process. The enhanced removal of trace Cr(VI) could be originated from the introduction of Co, which not only served as a protecting agent against surface corrosion by galvanic cell effect, but also enhanced the efficient flow of electron transfer between iron and Cr(VI). All the results primarily imply that FeCo BNPs can be employed as high efficient material for wastewater treatment.
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    Journal Title
    Journal of Colloid and Interface Science
    Volume
    472
    DOI
    https://doi.org/10.1016/j.jcis.2016.03.025
    Subject
    Physical sciences
    Chemical sciences
    Other chemical sciences not elsewhere classified
    Engineering
    Publication URI
    http://hdl.handle.net/10072/100124
    Collection
    • Journal articles

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