The facile preparation of 5,10,15,20-tetrakis(4-carboxyl phenyl) porphyrin-CdS nanocomposites and their photocatalytic activity

The 5,10,15,20-tetrakis (4-carboxyl phenyl)-porphyrin-functionalized CdS nanocomposites (H2TCPP-CdS NCs) were successfully prepared by a facile one-step method under mild conditions and were extensively characterized by X-ray diffraction, transmission electron microscopy, Fourier transform infrared spectroscopy, UV–vis diffuse reflectance. Rhodamine B (RhB) dye, a common industrial pollutant, was used as a model pollutant to study its photocatalytic activity under exposure to solar light. The results showed that the as-prepared H2TCPP-CdS NCs exhibited enhanced photocatalytic activity for the degradation of RhB dissolved in water under exposure to solar light. The degradation efficiency of RhB catalyzed by the H2TCPP-CdS NCs under exposure to solar light is higher than when exposed to UV light. The degradation and decolorization of RhB were influenced by different amounts of porphyrin in preparation of H2TCPP-CdS NCs, the amount of catalyst, and the initial concentration of dye solution and pH. Moreover, the recycling experiments confirmed the relative stability and reutilization of the catalyst.