Acta Phys. -Chim. Sin. ›› 2015, Vol. 31 ›› Issue (12): 2332-2340.doi: 10.3866/PKU.WHXB201510202

• CATALYSIS AND SURFACE SCIENCE • Previous Articles     Next Articles

Preparation of Reduced Graphene Oxide/TiO2 Nanocomposites and Their Photocatalytic Properties

Qi. QI1,Yu-Qiao. WANG1,*(),Sha-Sha. WANG1,Hao-Nan. QI1,Tao. WEI2,Yue-Ming. SUN1,*()   

  1. 1 1School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, P. R. China
    2 School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou 325035, Zhejiang Province, P. R. China
  • Received:2015-08-21 Published:2015-12-04
  • Contact: Yu-Qiao. WANG,Yue-Ming. SUN E-mail:yqwang@seu.edu.cn;sun@seu.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(21173042);National Key Basic Research Program of China (973)(2013CB932902);Fundamental Research Funds for the Central Universities, China(2242014K10025,3207045419);Natural Science Foundation ofJiangsu Province, China(BK20141338);Science & Technology Support Project of Jiangsu Province, China(BE2013118);Special Funds forTransformation of Scientific & Technological Achievements of Jiangsu Province, China(BA2014069);Seminar Funds of Southeast University,China(1107041501);Practice Innovation Program for Graduate Students of Jiangsu Province, China(SJLX150047)

Abstract:

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.

Key words: Graphene, TiO2, Nanocomposite, Hydrothermal method, Photocatalysis property

MSC2000: 

  • O646