Acta Phys. -Chim. Sin. ›› 2011, Vol. 27 ›› Issue (08): 1941-1946.doi: 10.3866/PKU.WHXB20110836

• CATALYSIS AND SURFACE SCIENCE • Previous Articles     Next Articles

Photocatalytic Activity of TiO2 with Micrometer-Sized Macropores

TONG Xin, CHEN Rui, CHEN Tie-Hong   

  1. Institute of New Catalytic Materials Science, Key Laboratory of Advanced Energy Materials Chemistry (MOE), College of Chemistry, Nankai University, Tianjin 300071, P. R. China
  • Received:2011-03-17 Revised:2011-06-09 Published:2011-07-19
  • Contact: CHEN Tie-Hong E-mail:chenth@nankai.edu.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (20873070, 20973095).

Abstract:

Macroporous TiO2 with aligned channels was synthesized using citric acid as a chelator. The wall of the macropore was composed of nanosized anatase crystals. The degradation of rhodamine B (RhB) was used as a model reaction to test the photocatalytic activity of the samples. Compared with ground TiO2 powder, macroporous TiO2 with aligned channels did not give a better photocatalytic RhB degradation property. Because of the scattering of UV-light by anatase nanoparticles, the TiO2 located inside the macroporous wall was not irradiated by UV-light, and this affected the photocatalytic property of the macroporous TiO2. The photocatalytic property improved upon exposing more of the external TiO2 surface to UV light. Furthermore, uniform and dispersed micrometer sized TiO2 spheres were fabricated using cetyltriethylammonium bromide (CTAB) and polyacrylic acid (PAA) as templates. The photocatalytic degradation of RhB confirmed that reducing the particle size improved the efficiency of the photocatalytic activity.

Key words: TiO2, Photocatalysis, Morphology, Macroporous structure, Scattering

MSC2000: 

  • O643