Visible-Light Photocatalytic Degradation of Methylene Blue with Porphyrin-Sensitized TiO₂

Abstract:

The photocatalytic degradation of methylene blue (MB) under visible light irradiation is investigated by using the TiO₂ photocatalyst sensitized with meso-tetra (4-carboxyphenyl) porphyrin (H₂TCPP) and/or meso-tetra (4-carboxyphenyl) copper porphyrin (CuTCPP). The XRD and XPS experimental results indicate that porphyrins are chemisorbed on the surface of TiO₂ through the O=C-O-Ti chemical bond. The degradation of methylene blue (MB) by H₂TCPP and/or CuTCPP sensitized TiO₂ and under incandescent lamp irradiation is likely through injecting electrons from the photoexcited sensitizer to the conduction band of TiO₂. The porphyrin-and/or metallic porphyrin-sensitized TiO₂ exhibits higher absorbability in the visible-light region than pure TiO₂. All facts show that the porphyrin-, and/or metallic porphyrin-sensitized TiO₂ have potentially a significant application in wastewater treatment.

• Periodical: Advanced Materials Research (Volume 441)
• Pages: 544-548
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.441.544
• Online since: January 2012
• Authors: Jun Min Wan, Zhang Zhu Wu, Hui Gang Wang, Xu Ming Zheng
• Keywords: Methylene Blue (MB), Nanoparticle, Porphyrin, TiO₂, Visible-Light Photocatalysis

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