Synthesis And Photocatalytic Properties Of TiO₂ Nanocomposites Doped C₆₀/C₇₀ Fullerenols

TiO₂ has been the most promising and intensively investigated photocatalyst, because of its chemical stability, high catalytic activity, low costs and no toxicity. However, the large band gap?3.2 eV?, low quantum efficiency, and the high degree of recombination between photo-generated electrons and holes under ultraviolet light of TiO₂. It has some disadvantages, such as the large band gap?3.2 eV?, low quantum efficiency, and the high degree of recombination between photo-generated electrons and holes under ultraviolet light.The disadvantages mentioned above lead to the poor degradation efficiency towards organic pollutants in the visible region. In this article, we synthesized high catalytic nanocomposite materials through doping fullerenols with different carbon cages(C₆₀, C₇₀) into TiO₂, namely fullerenols/TiO₂. We also investigated the materials' effectiveness of catalysis and oxidation on organic dye Rhodamine B. The main work of the thesis is as follows:?1? Fullerenes have high electron affinity, good molecular stability and high electron-transporting properties. Fullerenes(C₆₀,C₇₀) with high purity are as raw materials.Using TABH method, we synthesized water-soluble and polyhydroxylated fullerenols. In this way, the solubility and dispersion in water for fullerenes are improved. We have further taken a series of characterization of the composites, such as FTIR, XRD, TG,TEM and so on.?2? The synthesizing method, namely ultraviolet auxiliary method,has the advantages of mild reaction conditions, low costs and no pollution. Composite of fullerenols and TiO₂ can be realized under ultraviolet illumination. Then the nanocomposite PHF/TiO₂ with good photocatalytic performance and aqueous dispersion is successfully synthesized, and take a series of characterization of the composites, such as FTIR, XRD,TG,TEM and so on.?3? We compare the photo-catalysis capability of fullerenols, nanocomposite PHF/TiO₂ and nano TiO₂ though the degradation of Rhodamine B in visible light. Finally, we demonstrate that the nanocomposite PHF(C₇₀)/TiO₂ leads to the best photo-catalysis performance.