The Relationship Between the TiO₂ Photocatalyst Deactivation, Regeneration and the Concentration of the Surface Adsorbed SO₄^2-

Abstract:

The photolysis ability and adsorption ability of TiO₂ was detected and measured using acetaldehyde as a probe. The quantitative relationship between the TiO₂ deactivation and the concentration of the surface adsorbed SO₄^2- was obtained by intentional controls of the concentrations of the surface adsorbed SO₄^2-. When the concentration of the surface adsorbed SO₄^2- reached 2.0 wt%, the photolysis ability of the TiO₂ photocatalyst decreased by 50%, and when the concentration was 2.9 wt%, the TiO₂ adsorption ability decreased by 50%. 90% of the absorbed SO₄^2- can be removed after the samples have been washed by overflowing water for 2 hours at a rate of 2 L.min^-1 and the photocatalytic activity can be regenerated. This work will help to predict the lifetime of TiO₂ photocatalyst in actual applications as well as to understand its regenerations of the photocatalytic capability.

• Periodical: Advanced Materials Research (Volumes 306-307)
• Pages: 1557-1562
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.306-307.1557
• Online since: August 2011
• Authors: Yue Huang, Zhong Hua Zhou, Yu Ping Wu, Yan Chao Meng, Shirley Shen
• Keywords: Deactivation, Photocatalyst, Regeneration, SO₄^2-, TiO₂

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