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 [ Time:2018/1/29 ]
Researchers find the selective adsorption of doped hematite toward heavy metal ions
Author :YE Yixing

Researchers in Lab of Laser Fabrication in Liquids, Institute of Solid State Physics, Hefei Institutes of Physical Science reported the their research results of facet-dependent selective adsorption of Mn-doped Ž┴-Fe2O3 nanocrystals toward heavy metal ions in Chemistry of Materials (Chem. Mater., 2017, 29, 10198−10205).

Hematite (Ž┴-Fe2O3) is naturally abundant and thermodynamically the most stable semiconductor among ferric oxides. Ž┴-Fe2O3 has shown important applications in photoelectrochemical water splitting, lithium-ion batteries, gas sensing, and biotechnology.

Recently, morphological control of Ž┴-Fe2O3 nanocrystals draws much attention for developing effective catalysts. Thus, it would be interesting to synthesize hematite nanocrystalline with exposed active by doping Mn impurities in laser ablation technology.

Researchers find that the face selectivity of Mn-doped Ž┴-Fe2O3 nanocrystals (NCs) is related to the doping level of elemental Mn. By increasing the doping level of Mn, they finally successfully obtained isotropic polyhedral nanoparticles (NPs), {116}-faceted saucershaped nanosheets (NSs), and {001}-faceted hexagonal NSs. Interestingly, these Mn-doped Ž┴-Fe2O3 NCs show a facet-dependent adsorption ability toward Pb(II), Cd(II), and Hg(II) heavy-metal ions, which was further testified by density functional theory (DFT) calculations.
These experimental and computational results not only shed new light on the facet-related properties, but also guide the design of crystals with exposed active facets for specific applications.

This research was supported by China í░National Key Basic Research Programí▒, í░National Natural Science Foundationí▒, í░International Partnership Program for Creative Research Teamsí▒ of the Chinese Academy of Sciences, and et al.

 (J) Pb on (001), (K) Cd on (001), (L) Pb on (116), and (M) Cd on (116). Units of bond length are Å. (N) The schematic of facet-dependent selective adsorption of Mn-doped Fe2O3.

Chemistry of Materials:

LIANG Changhao
Key Laboratory of Materials Physics and Anhui Key Laboratory of Nanomaterials and Nanotechnology, Institute of Solid State Physics, Hefei Institutes of Physical Science,CAS
350 Shushanhu Road, Hefei 230031, China.
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