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Issue 15, 2018
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Structural study on PVA assisted self-assembled 3D hierarchical iron (hydr)oxides

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Polymers with hydroxyl groups may have great influence on the formation process of metal oxides due to complexation. To better study the interaction mechanism between polyhydric polymer and iron (hydr)oxide, herein, without using surfactants or toxic matters, 3D hierarchical iron (hydr)oxide with different nanostructures were obtained with the assistance of polyvinyl alcohol (PVA). The influences of PVA concentration, temperature, and reaction time on the product structure were investigated. Then, the formation mechanisms are discussed. Under different PVA concentrations and temperature, varies products were obtained, such as α-FeOOH, α-Fe2O3, and their mixtures. On increasing the PVA concentrations, the material morphology changes from flower-like nanostructures to urchin-like microspheres and finally into nanoplates. Furthermore, an increase in reaction temperature would lead to the formation of microspheres with a smoother surface. The urchin-like α-FeOOH obtained at a moderate PVA condition has the best adsorption performance for Congo red with a maximum adsorption capacity of 287.35 mg g−1, which was a great improvement when compared to that of the sample obtained from pure water (173.01 mg g−1). The results reflect the potential advantages of the polymer applied for the structural improvement of nanomaterials.

Graphical abstract: Structural study on PVA assisted self-assembled 3D hierarchical iron (hydr)oxides

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The article was received on 16 Jan 2018, accepted on 28 Feb 2018 and first published on 01 Mar 2018

Article type: Paper
DOI: 10.1039/C8CE00075A
Citation: CrystEngComm, 2018,20, 2093-2101

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    Structural study on PVA assisted self-assembled 3D hierarchical iron (hydr)oxides

    Y. Kong, Y. Zhuang, J. Yu, Z. Han and B. Shi, CrystEngComm, 2018, 20, 2093
    DOI: 10.1039/C8CE00075A

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