Simple synthesis of high photocatalytic activity TiO2 nanopowder with sodium dodecylbenzene sulfonate surfactant for photocatalysis of rhodamine B and methyl orange

摘要

In this study, the TiO2 nanopowder with high photocatalytic activity has been successfully synthesized by a simple solvothermal method process without annealing by sodium dodecyl benzene sulfonate(SDBS) as surfactants. Meanwhile, effects of SDBS content on photocatalytic activity and properties of the TiO2 nanopowder were systematically examined by the XRD, SEM, TEM, BET, XPS, UV-Vis DRS, TOC, photoelectrochemical and photodegradation experiments. The sample T without modification showed good photocatalytic performance under visible light irradiation. Its degradation efficiency of rhodamine B (RhB) and methyl orange (MO) was 3.6 times and 3.1 times that of P25, respectively. With the increase of the SDBS content, the photocatalytic activity of TiO2 nanopowder was significantly improved. For degradation of RhB, the photocatalytic degradation efficiency of T-1.0wt%SDBS is 51 times that of P25. For degradation of MO, the photocatalytic degradation efficiency of T-1.0wt%SDBS is 5.3 times that of P25. And the related mechanisms were studied. These experimental results show that adding a small amount of SDBS in the simple synthesis process can observably enhance the specific surface area of TiO2 and the amount of adsorbed O-2 and H2O, thereby greatly improves the photocatalytic activity.

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