The Synthesis, Characterization And Photoactivity Of Mesoporous Titanium Phenylphosphonates In Photocatalyzed Degradation Of Rhodamine B Dye

Mesoporous phosphonates are a novel inorganic-organic hybrid materials. They possess not only typical mesorporous materials but also tailoring structure of coordination polymers, which makes the functions of mesoporous phosphonates can be controlled through adjusting metal ions and phosphonic acids. So, mesoporous phosphonates exhibit potential applications in the fields of catalysis, adsorption as well as biology and medicine.In this dissertation, mesoporous titanium phenylphosphonates has been synthesized by co-condensation of phenylphosphonic acid (PPA) and TiCl4in the presence of anionic surfactant of sodium dodecyl sulfate (SDS) under weak acidic conditions. The mesoporous titanium phenylphosphonates were charactered by N2adsorption-desorption,scanning electron microscope and FT-IR to investigate their mesoporous structure, morphology and composition. The results of N2adsorption-desorption show these mesoporous materials exhibit high surface areas and large pore volume. Moreover, the pore diameter of the materials can be controlled by adjusting surfactant amount in the initial mixture and the pore diameter can reach as large as18.1nm. The photos of SEM indicate the materials are blocks assembled from irregularly spherical particles. FT-IR spectra illustrate phenyl groups has been incorporated into the framework of the materials, and phenyl groups can retain its structural integrity during the synthesis and the abstraction of surfactant.The synthesized mesoporous titanium phenylphosphonates as photocatalysts were used in photocatalyzed degradation of rhodamine B dye to value their photoactivity. The results show mesoporous titanium phenylphosphonates exhibit moderate photoactivity in photocatalyzed degradation of rhodamine B dye under Uv-light irradiation. Rhodamine B dye with concentration of10-5mol/L were degraded about50%within2h. The initial degradation rate of mesoporous titanium phenylphosphonates is much larger than that of mesoporous titania reported in references although photodegradation efficiency of mesoporous titanium phenylphosphonates is lower than that of mesoporous titania. This may be due to the photoactive sites for photocatalysis on the surface of mesoporous titanium phenylphosphonates covered by photodegradation products quickly.The successful synthesis of mesoporous titanium phenylphosphonates and the preliminary application of the materials as photocatalysts in photocatalyzed degradation of rhodamine B dye, which is a valuable try of the design of mesoporous phosphonates aiming at the applications. The research work is a modest spur to induce others to come forward with valuable contributions to oriented design and synthesis of mesoporous phosphonates.