Citation:
QI Qi, WANG Yu-Qiao, WANG Sha-Sha, QI Hao-Nan, WEI Tao, SUN Yue-Ming. Preparation of Reduced Graphene Oxide/TiO2 Nanocomposites and Their Photocatalytic Properties[J]. Acta Physico-Chimica Sinica,
;2015, 31(12): 2332-2340.
doi:
10.3866/PKU.WHXB201510202
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P25-reduced graphene oxide nanocomposites (RGO-P25) are prepared by using a facile one-step hydrothermal method. Their structure and photoelectrical properties are characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), and ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS). The degradation effect of different addition ratios of the RGO-P25 nanocomposite on the photocatalytic degradation of methylene blue (MB) is investigated under UV and visible illumination. Results show that graphene oxide can be reduced during the hydrothermal reaction and thus, a mixed high defect P25 particles and RGO sheet composite is formed by electrostatic attraction. Band gaps of nanocomposites decreased from 3.00 to 2.27 eV with an increase in the amount of the RGO content. The electrical conductivities of the nanocomposites enhanced with an increased RGO amount. Over 80% of the initial methylene blue dye is decomposed by 1% (w, mass fraction) RGO-P25 after 30 min under either visible light or ultraviolet light. Under UV light illumination, 63% (molar fraction) of the N3 dye, cis-Ru(H2dcbpy)2(NCS)2 (H2dcbpy = 4,4'- dicarboxy-2,2'-bipyridyl), is decomposed by the 1% RGO-P25 nanocomposite. Compared with the bare P25 (75% anatase; 25% rutile), the continual addition of RGO enhances the photocatalytic activity and gives rise to the more effective separation of photogenerated electron-hole pairs.
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Keywords:
- Graphene,
- TiO2,
- Nanocomposite,
- Hydrothermal method,
- Photocatalysis property
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