Characterization and photocatalytic properties of Ru, C co-modified one-dimensional TiO2-based composites prepared via a single precursor approach

摘要

With Ru_3(CO)_(12) being used as precursor, Ru and C co-modified one-dimensional nano TiO_2 composites (Ru-C/TiO _2) were prepared by the single precursor approach. The composites were characterized with TEM, XRD, UV-Vis DRS, XPS, TG-DTA, ICP, and EA. TEM images showed that RuO_2 nanoparticles, whose size was in the range of 3-7 nm, were uniformly dispersed on the surface of TiO_2. XPS results revealed that the carbon in Ru-C/TiO_2 calcinated in N_2 atmosphere existed as active carbon and carbonate, and ruthenium existed as Ru~(4+) ions. The photocatalytic performances of products were evaluated by monitoring their catalytic activities for degradation of methyl orange solution under both UV and simulated sunlight irradiations. The influences of contents of ruthenium and carbon, calcination temperature and atmosphere on the photocatalytic activities of the composites were investigated. Obtained results showed that the Ru-C/TiO_2 calcinated at 500 C in N_2 atmosphere exhibited higher photocatalytic activity than P25 under the same conditions.