Abstract
Solvothermal process had been used to obtain different morphological TiO2 and their graphene (GR) composites. The materials were characterized by X ray diffraction (XRD), field emission scanning electron microscopy (FESEM), fourier transform infrared spectroscopy (FTIR), brunauer-emment-teller (BET) and ultraviolet-visible diffuse reflectance (UV–vis DRS). FTIR revealed that the covalent bonds had been formed between TiO and carbon atoms at the surface of GR. The diameter of TiO2 nanorods (TNR) was 43–103 nm, and the length of TNR was 0.2–4.5 μm. The width of TiO2 nanosheets (TNS) was 50–180 nm, and the thickness of TNS was 6–18 nm Both of TNS and TNR were combined with GR in the form of agglomerates. The adsorption-photocatalytic activities of TiO2 nanorods (TNR), TiO2 nanosheets (TNS), TNR-GR and TNS-GR for methylene blue (MB) followed the order of TNS-GR > TNS > TNR-GR > TNR. The kinetic studies showed that the photocatalytic degradation process fitted well with the pseudo-first-order model. The band gaps of TNR-GR and TNS-GR had been decreased to 0.07 eV and 0.08 eV compared with that of TNR and TNS respectively, as measured from UV–vis DRS patterns. The decrement of the band gap was relative to the amount of TiOC bonds between GR sheets and TiO broken bonds. Based on the proposed mechanism, the obtained result suggested the enhanced adsorption-photocatalytic property was attributed by TiOC bands.
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