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Synthesis, characterization and photocatalytic activity of mixed-metal oxides derived from NiCoFe ternary layered double hydroxides

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Abstract

Ternary NiCoFe mixed-metal oxides (NCF-MMOs) with different Ni/Co/Fe ratios were successfully synthesized through a hydrotalcite-like precursor route by co-precipitation of appropriate amounts of metal salts from homogeneous solution, followed by calcination at 600 °C. X-ray diffraction (XRD) patterns revealed the formation of well crystalline layered double hydroxides (LDHs), particularly at the M2+/M3+ ratio of 3 : 1. Brunauer–Emmett–Teller (BET) analysis revealed that the resulting NiCoFe LDHs possessed large specific surface areas (66.9–93.8 m2 g−1). The NCF-MMO (1 : 2 : 1) samples were demonstrated to be formed by the aggregation of regular cubes with an edge length of about 2 μm, and each cube was accumulated with many fine particles with a size of ∼130 nm. UV–vis diffuse reflection spectroscopy (DRS) confirmed that the samples showed a broad absorption in the visible-light region (450–750 nm), with a low band gap of 2.33–2.77 eV. The calcined samples with a Ni/Co/Fe molar ratio of 1 : 2 : 1 possessed the best photocatalytic activity with 96.8% degradation of methylene blue (MB) dye under visible light irradiation for 4 h, which exceeded those of commercial P25 TiO2, binary NiFe mixed-metal oxides and pure Fe2O3, CoO and NiO particles under the same conditions. NCF-MMO (1 : 2 : 1) also had a strong degradation effect on the non-dye pollutant phenol as well. Kinetic studies suggested that the degradation of MB followed a pseudo-first-order kinetic behavior. The photodegradation mechanism of NCF-MMOs was also discussed.

Graphical abstract: Synthesis, characterization and photocatalytic activity of mixed-metal oxides derived from NiCoFe ternary layered double hydroxides

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Publication details

The article was received on 19 Mar 2018, accepted on 25 Jun 2018 and first published on 25 Jun 2018


Article type: Paper
DOI: 10.1039/C8DT01045E
Citation: Dalton Trans., 2018, Advance Article
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    Synthesis, characterization and photocatalytic activity of mixed-metal oxides derived from NiCoFe ternary layered double hydroxides

    D. Pan, S. Ge, J. Zhao, Q. Shao, L. Guo, X. Zhang, J. Lin, G. Xu and Z. Guo, Dalton Trans., 2018, Advance Article , DOI: 10.1039/C8DT01045E

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