2.The photocatalytic activity and degradation mechanism of methylene blue over copper( II ) tetra(4-carboxyphenyl) porphyrin sensitized TiO2 under visible light irradiation

作者：Huigang Wang, * ^abc Dongmei Zhou, ^a Shaosong Shen, ^a Junmin Wan, ^a Xuming Zheng, * ^a Lihong Yu ^b and David Lee Phillips ^b

来源：RSC Adv., 2014, 4, 28978–28986

DOI：10.1039/c4ra03979c

摘要：

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 (H 2 TCPP) 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 H 2 TCPP 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.

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