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- Title
Preparation of TiO-Graphene Composite by a Two-Step Solvothermal Method and its Adsorption-Photocatalysis Property.
- Authors
Liu, Xiao-wen; Shen, Ling-yan; Hu, Yue-hua
- Abstract
TiO-graphene (TiO-GR) composites were successfully prepared by a two-step solvothermal method using titanium dioxide and natural graphite powder. X-ray diffraction (XRD) patterns showed that graphene oxide (GO) was prepared from natural flake graphite by a modified hydrothermal pressurized oxidation method. The results of Fourier transform infrared spectroscopy (FTIR) proved that TiO-GR composites were synthesized during the process of hydrothermal reaction while GO was changed into graphene. X-ray photoelectron spectroscopy (XPS) demonstrated that TiO particles contacted closely with graphene via Ti-O-C bonds. The results of Raman spectra confirmed the existence of graphene in the TiO-GR composite. Scanning electron microscopy (SEM) images showed that TiO particles were oval and grafted on the graphene sheet which was smooth with ripples. UV-visible diffuse reflectance spectra demonstrated that there was a red shift in the absorption edge of TiO-GR composite. The experimental results indicated that the TiO-GR composite had significantly adsorption-photocatalytic activity for the degradation of methylene blue (MB) dyes. The adsorption capacity ( q ) of TiO-6%GR-4h for MB was 41.32 mg ⋅ g calculated based on the Langmuir adsorption model, which was about 3.3 times the adsorption capacity of TiO. Adsorption kinetics studies showed that the adsorption process fit well with the pseudo-second-order model. It proved that the TiO-GR composites were more efficient than the pure TiO in the field of environmental protection.
- Subjects
TITANIUM oxides; TITANIUM dioxide; GRAPHENE; GRAPHITE; X-ray diffraction; GRAPHENE oxide
- Publication
Water, Air & Soil Pollution, 2016, Vol 227, Issue 5, p1
- ISSN
0049-6979
- Publication type
Article
- DOI
10.1007/s11270-016-2841-z