Inorganics (Aug 2023)

Significantly Enhanced Self-Cleaning Capability in Anatase TiO<sub>2</sub> for the Bleaching of Organic Dyes and Glazes

  • Tiangui Zhao,
  • Tihao Cao,
  • Qifu Bao,
  • Weixia Dong,
  • Ping Li,
  • Xingyong Gu,
  • Yunzi Liang,
  • Jianer Zhou

DOI
https://doi.org/10.3390/inorganics11080341
Journal volume & issue
Vol. 11, no. 8
p. 341

Abstract

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In this study, the Mg2+-doped anatase TiO2 phase was synthesized via the solvothermal method by changing the ratio of deionized water and absolute ethanol Vwater/Vethanol). This enhances the bleaching efficiency under visible light. The crystal structure, morphology, and photocatalytic properties of Mg-doped TiO2 were characterized by X-ray diffraction, scanning electron microscopy, high-resolution transmission electron microscopy, N2 adsorption-desorption, UV-Vis spectroscopy analysis, etc. Results showed that the photocatalytic activity of the Mg2+-doped TiO2 sample was effectively improved, and the morphology, specific surface area, and porosity of TiO2 could be controlled by Vwater/Vethanol. Compared with the Mg-undoped TiO2 sample, Mg-doped TiO2 samples have higher photocatalytic properties due to pure anatase phase formation. The Mg-doped TiO2 sample was synthesized at Vwater/Vethanol of 12.5:2.5, which has the highest bleaching rate of 99.5% for the rhodamine B dye during 80 min under visible light. Adding Mg2+-doped TiO2 into the phase-separated glaze is an essential factor for enhancing the self-cleaning capability. The glaze samples fired at 1180 °C achieved a water contact angle of 5.623° at room temperature and had high stain resistance (the blot floats as a whole after meeting the water).

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