Photocatalytic degradation of methylene blue over 2D CuTCPP/B–TiO2 composites.

Two dimensional (2D) CuTCPP/B–TiO₂ composites were successfully synthesized by addition of B–TiO₂NPs into the system for preparation of 2D CuTCPP nanosheets under hydrothermal condition. 2D CuTCPP nanosheets with large specific surface area can not only act as supportor to decrease the aggregation of B–TiO₂ and improve the adsorption capacity of methylene blue (MB) but also provide more transfer pathway to effectively facilitate interfacial charge transfer and separation of photogenerated electrons and holes, thus leading to a superior efficiency for photodegradation of MB. The photocatalytic degradation rate constant of 2D CuTCPP/B–TiO₂ composites is 0.0486 min⁻¹, which is about 15.2, 5.92 and 4.23 times that of P25 (k = 0.0032 min⁻¹), 2D CuTCPP nanosheets ((k = 0.0082 min⁻¹) and B–TiO₂NPs (k = 0.0115 min⁻¹). This study demonstrates that the combination of B–TiO₂NPs and 2D CuTCPP is a viable strategy to improve the photocatalytic efficiency for degradation of MB. [ABSTRACT FROM AUTHOR]