Hydrothermal Synthesis and Photocatalytic Properties of Cobalt-Doped Tungsten Oxide

G. S. Zakharova; Захарова Г. С.; N. V. Podval’naya; Подвальная Н. В.; T. I. Gorbunova; Горбунова Т. И.; M. G. Pervova; Первова М. Г.

doi:10.31857/S0044457X22602127

Hydrothermal Synthesis and Photocatalytic Properties of Cobalt-Doped Tungsten Oxide

Authors: Zakharova G.S.¹, Podval’naya N.V.¹, Gorbunova T.I.², Pervova M.G.²
Affiliations:
1. Institute of Solid State Chemistry, Ural Branch, Russian Academy of Sciences
2. Postovsky Institute of Organic Synthesis, Ural Branch, Russian Academy of Sciences
Issue: Vol 68, No 4 (2023)
Pages: 435-443
Section: СИНТЕЗ И СВОЙСТВА НЕОРГАНИЧЕСКИХ СОЕДИНЕНИЙ
URL: https://ruspoj.com/0044-457X/article/view/665265
DOI: https://doi.org/10.31857/S0044457X22602127
EDN: https://elibrary.ru/FMYUIV
ID: 665265

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Abstract

Hexagonal tungsten trioxide–base interstitial solid solutions of general formula CoxWO3, where 0.01 ≤ x ≤ 0.09, were prepared hydrothermally. The dopant homogeneity extent was found to depend on рН in the working solution. Interstitial solid solutions with the highest Co2+ concentrations were formed at рН of 2.3. The CoxWO3 samples with a fiber-like morphology with a fiber diameter of ca. 40 nm, which were prepared at рН of 2.3, had the highest specific surface area, equal to 38.6 m2/g. The key parameter for the stability of the CoxWO3 crystal structure appeared to be ammonium ions residing in the hexagonal channels of the crystal structure. When tested as photocatalysts of 1,2,4-trichlorobenzene oxidation under the UV light, the prepared samples showed high chloroarene conversions and low selectivities to yield a wide range of organic compounds, including chlorine-free ones.

Keywords

tungsten oxide, doping, cobalt, hydrothermal synthesis, photocatalysis

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